DJI Wookong-H User Manual

WooKong HELI User Manual
V 1.8
www.dji-innovations.com
©2012 DJI Innovations. All Rights Reserved. 1
Disclaimer
FORBIDDEN
Please refer to the page(s) mentioned
TX
R/C Transmitter configuration required
WKH Assistant configuration required
CAUTION
Assembly& Mounting Tips
General Tips
Correct/ Wrong
DJI WooKong is registered trademark of DJI Innovations. Names of product, brand, etc., appearing in this manual are trademarks or registered trademarks of their respective owner companies. This product and manual are copyrighted by DJI Innovations with all rights reserved. No part of this product or manual shall be reproduced in any form without the prior written consent or authorization of DJI Innovations. No patent liability is assumed with respect to the use of the product or information contained herein.

Readers Guide for This Manual

Please strictly follow these steps to mount and connect WooKong for Heli (WKH) system on your helicopter, as well as to install the WKH Assistant Software on your computer. Please pay attention at Lite for the difference between WKH and WKH Lite.
Icons seen in this document:

Contents

DJI WKH Introduction ........................................ 3
Package Contents .............................................. 4
Mounting and Connection ................................. 5
A1 Before you Begin ........................................... 5
A2 Mount the devices on your helicopter ............ 5
A3 Connections................................................... 7
A4 WKH Assistant Software Basic Operation ..... 9
Flight & Configuration Procedure Brief ......... 10
Configuration Procedure ................................. 11
B1 GPS & IMU Mounting .................................. 11
B2 Control Mode Switch ................................... 12
B3 Flybarless .................................................... 13
B4 Swashplate .................................................. 14
B5 Pitch and Throttle Curve Setup.................... 14
B6 Tail Gyro ...................................................... 15
B7 Engine Governor ......................................... 16
B8 R/C Transmitter Calibration ......................... 17
B9 System Check ............................................. 18
B10 Autopilot ...................................................... 19
Flight ................................................................. 20
C1 Digital Compass Calibration ........................ 20
C2 MANUAL MODE Test Flight ........................ 21
C3 Fail-Safe ...................................................... 22
C4 Autopilot Test Fight...................................... 23
Maintains .......................................................... 23
Firmware Upgrade ................................................ 25
Product Info ........................................................... 25
Appendix ........................................................... 26
WKH LED Indicator Description ............................ 26
WKH Lite LED Indicator Description ..................... 26
Product Specifications ........................................... 27
©2012 DJI Innovations. All Rights Reserved. 2 |

DJI WKH Introduction

GPS Atti. Mode
Atti. Mode
Manual Mode
Command Stick Meaning
Helicopter attitude control; Stick center position for 0˚ attitude, its endpoint for 45˚which is a fixed limit.
Mechanical driving
directly
Command Linearity
YES
NO
Stick Released
Lock helicopter position when GPS
signal is adequate
Only altitude stabilizing
Recommend for experience pilot
Altitude lock
Best maintain altitude above 3 meters
NO
Flight Altitude
No limit, but will switch into Atti. Mode
automatically over 50m.
No limit
No limit
Stabilization
Flybarless stabilizing on ELEV and AILE direction is available for all control mode
GPS Lost
After 10s when GPS signal lost, system enters
Atti. Mode
. Automatically.
Only performing attitude stabilizing without position lock.
---
Safety
Attitude & speed mixture control ensures stability.
Depends on experience
Fail-safe featured, auto hover or level if transmitter signal lost
Appropriate Applications
High agility for all flying
---
The flying direction (YAW) of helicopter will be effected by cross wind. WKH can detect the drifting angle & Speed, and control the rudder servo to eliminate such influences. In the case of flying forward in cross-wind, Tail Gyro can work on two different modes as the example shown.
Heading
Heading
Head-locking Mode
Rate Mode
Cross-Wind
1 2 3
WKH is the flight system designed for serious scale helicopter enthusiasts providing GPS for self-leveling, position hold, speed control and built-in tail gyro which completely takes the stress out of flying RC helicopters for both professional and hobby applications. WKH can be installed in a variety of models, from small electric helicopters to large gasoline and turbine helicopters. WKH Lite is the no GPS and LED version of WKH.
Multiple control mode based on autopilot system:
Lite There is no GPS Atti. Mode in WKH Lite.
Built-in functions include:
Integrated tail gyro
Flybarless rotor head support  Integrated engine governor for internal combustion engines  Build-in semi auto take off & landing
©2012 DJI Innovations. All Rights Reserved. 3 |

Package Contents

Main Controller
The Main Controller (MC) is the brain of the WKH. MC communicates with the IMU, GPS/Compass, engine governor, servos and RC transmitter to carry out autopilot functionality. USB interface is for WKH configure and firmware update from a PC. (System requirement: Windows XP SP3 or Windows 7)
GPS & Compass module
Lite Not in WKH Lite
The GPS/Compass module should be installed on the tail boom, where there is a clear view of the sky.
×1
IMU
The Inertial Measurement Unit (IMU) consists of one 3-axis accelerometer, one 3-axis gyroscope and a barometer.
×1
GPS Tail Boom Mount
Lite Not in WKH Lite
The GPS Tail Boom Mount and double-sided foam tape enable secured installation for the GPS/Compass module on almost any helicopters.
3-PIN Servo Cable
Cables used to connect the Main Controller to the RC receiver.
×10
LED Indicator
The LED indicates the different system states.
Micro USB Cable
This cable is used to configure WKH, update firmware.
×1
3M 5925 Double Sided Tape
Lite Not in WKH Lite
Only for GPS & Compass module
×4
Warranty Information Card
WKH comes with a two-year warranty, as described on this card. Please keep this for your personal records.
×1
×1
×1
©2012 DJI Innovations. All Rights Reserved. 4 |

Mounting and Connection

IMU
Where? The IMU is best positioned near the helicopter’s center of gravity, where
vibration is relatively low.
What orientation? Orient the IMU such that the arrow marked on the above
surface of the IMU faces the sky and points directly forward, backward, left or right. The sides of the IMU should be precisely parallel to the helicopter body.
DO NOT MOUNT THE IMU UPSIDE-DOWN.
How? Use double-sided foam tape for secured installation.
1
Check the double-sided foam tape or Velcro regularly to ensure that the
IMU is securely positioned.
2
DO NOT cover the ventilation holes, keep them unobstructed.
3
The IMU module is NOT water-proof or oil-proof.
GPS & Compass Module
Lite WKH Lite customers can skip this step.
Where? Mount it on the tail boom, between the
rotor-head and the tail-rotor. The compass is sensitive to magnetic interference, so position the module at least 20 cm from servos and 30 cm from electric motors or gasoline (petrol) engines. The GPS is sensitive to vibration interference, so position the module at least 10 cm from the tail rotor. The GPS should not be close to the main rotor head because rotor blades can interfere with GPS satellite signal, the farther from the center of the rotor disk, the better. For scale helicopters we find either behind or in front of main shaft GPS positions can be applied. It can also be installed inside the fuselage where the fiber glass shell is relatively thin.
What Orientation? The DJI logo marked on the
GPS should face the sky, with the orientation arrow pointing directly forward. The GPS/Compass is packaged with a special indication line for mounting for the first time.
1
If you are uncertain whether materials near the GPS/Compass module are magnetic or not, you can use a compass or
magnet to check it.
2
GPS/Compass mounting-support hardware is included in the package. If however you prefer to use your own
GPS/Compass mount, please make sure that the mount material is NOT magnetic.
1 2
3 4

A1 Before you Begin

Fly the helicopter without WKH in open are or large field and make sure that the helicopter works properly without any autopilot assistance. To do so, you will need external tail gyro. This is a good time to isolate and resolve unwanted vibrations. IT IS IMPORTANT THAT YOU SHOULD NOT SKIP THIS STEP.

A2 Mount the devices on your helicopter

©2012 DJI Innovations. All Rights Reserved. 5 |
Main Controller
Where? There is no orientation requirement for the Main Controller. Maintain at least a 20-centimeter-distance between the
Main Controller and the engine or motor. Choose a mounting location where as shorter servo extension wires are needed as possible. This helps reduce the risks of electronic interference. Please also make sure the USB port is accessible when installing the Main Controller so as to facilitate software configuration.
After choosing a location to mount the Main Controller, it is recommended that you DO NOT mount the Main Controller until all wirings and software configurations are completed.
LED Indicator
Where? Place the LED indicator at appropriate location of helicopter body.
Make sure the LED indicator face down, and you can see the light.
©2012 DJI Innovations. All Rights Reserved. 6 |

A3 Connections

Rudder Servo
DO NOT connect the rudder servo until the servo type has been selected in Wookong Assistant.
Brushless Motor Controller (ESC)
Electric
Motor
Gas/Nitro
Engine
Throttle Servo
Swashplate Servo
3 or 4
Battery
MUST supply 4.8 - 8.4 volts.
Could be connect to any of the spare I/O port.
Micro-USB: PC connection for configuration and firmware upgrades.
GPS/COMPASS: Mount to the Tail boom, 20 cm from servos, 30 cm from motor, 10 cm from tail rotor.
Internal vibration isolation design, enable a more convenient
IMU mounting.
Main Controller
Engine Speed Sensor
R/C Receiver
LED: The LED indicates different states of whole system.
In-line CAN-Bus Port:
This CAN-Bus port can be used
for the LED module connection or for future hardware upgrades.
WKH Lite has no GPS/Compass
WKH Lite user should connect LED to CAN-Bus port on the MC directly.
CAN Bus–Interface for WKH Module
WKH Main Controller uses CAN-Bus to power and communicate with other WKH modules. Three connection ports are provided: two on the Main Controller and one in-line connection on the GPS/Compass wire. WKH identifies the connected devices automatically without configuration.
GPS/Compass module can be connected to either port of Main Controller. IMU can be connected to the Main Controller.
©2012 DJI Innovations. All Rights Reserved. 7 |
Receiver & Servos
STEP1: Set the transmitter to single-servo CCPM (Futaba: H-1; JR/Spectrum: 1sNORM; Hitec: 1-Servo 90°).
Connect the receiver to the Main Controller input servo ports.
R/C Receiver (Futaba / Hitec)
1
2
3
4
5
6
7
R/C Receiver (JR)
AUX2
AUX1
GEAR
RUDD
ELEV
RUDD
THRO
AILE
ELEV
GEAR
AUX1
AUX2
U
For Control Mode Switch
P
For collective pitch or up/down
G
For gyro sense adjusting
R
For rudder control
T
For throttle control
E
For cyclic pitch or front/back
A
For cyclic roll or left/right
STEP2: Connect the cyclic servos and throttle servo or ESC (NOT the rudder servo) to the
WKH output servo ports using the diagram corresponding to the swash type of your helicopter.
S1S1S3
S4
For swashplate servos
THR
For throttle servo or ESC
RUD
For rudder servo
F1
F2
Reserved for further usage.
S2
S1
90
o
S3
S4
S2
S1 S3
90
o
S2
S1
S3
140
o
S2
S1 S3
90
o
S2
S1
S3
120
o
S2
S1
S3
120
o
HR3
H3H140
H4
HE3
H1
*S3: Collective Pitch
Battery or BEC
WKH uses the same power source as the servos and receiver; power to all electronics connected to the Main Controller can be supplied by either servo input or output ports on the Main Controller. WKH operates with a power source between 4.8to 8.4 volts DC. When choosing a power source, bear in mind that all servos and WKH will use that same power source, thus please make sure the power source you use will also satisfy the servo requirements. A high capacity battery of 2000mAh or above is strongly advised, especially for large scale electric powered helicopter. Depending on servo types, digital servos will require 10A BEC for multi-bladed applications.
The power consumption of WKH is 5W maximum (testing condition:0.9A@5V).For some small scale helicopters, the BEC provided may not be able to supply enough overall power consumption, please use high performance BEC.
©2012 DJI Innovations. All Rights Reserved. 8 |

A4 WKH Assistant Software Basic Operation

Software and Driver Installation
Please read Software & Driver Installation Guide, the micro-USB port is used for WKH configuration and update firmware.
Introduction for Software GUI
1 234
16
15 14 13 12 11
10
6 75 8
9
I
II
How to adjust parameters?
I
Red and bold text indication if you changed anything;
II
Write parameters to main controller.
Except the direct edit items, they can be written to main controller directly.
1
TOOL
Firmware upgrade: update your firmware from DJI
server, keep your WKH system up-to-date.
Sign In: In order to provide better service to you,
please register for firmware update, software and manual download. If you have registered, please sign in here.
2
ABOUT
Information regarding your WKH
3
Export: export/save WKH configurations in files.
4
Import: load previously saved configurations.
5
Wizard: step-by-step, for your first-time-configuration.
6
Write: write data of latest settings of the current page to
your WKH main controller. The parameter value or the title of which will appear as red and bold in font when modifications have been made, make sure you click the
©2012 DJI Innovations. All Rights Reserved. 9 |
Write button to update your system.
7
Read: read parameters from main controller.
8
Write all: write latest settings and changes of all files to
your main controller.
9
Graphic guidance
10
Text guidance
11
Flybarless function ON/OFF indication
12
Engine governor working mode indication
13
Tail gyro working mode & gyro sense indication
14
Autopilot working mode indication
15
Red light: WKH PC has been disconnected.
Green light: WKH PC has been connected. Blue light: WKH PC communication.
16
Here you can find all the configuration pages the same as
in the Wizard.
1 For safety reasons, during configuration and system setup, please disconnect the power supply for Electric motor. 2 Please do the following configurations in Manual Mode of the autopilot system.
Steps
Description
Page
B1 GPS&IMU Mounting
Please measure the center-of-gravity (C.G.) of your helicopter, and fill in the distance between IMU/GPS and C.G. of helicopter in X, Y & Z axles;
11
B2 Control Mode Switch
Adjust your transmitter for channel
U
, and then you can switch the
autopilot working mode between Manual / GPS Atti. / Atti.;
12
B3 Flybarless
Please select flybarless ON/OFF. You might need to adjust parameters during test flight;
13
B4 Swashplate
Setup you swash plates according to your helicopter specification;
13
B5 Pitch & Throttle Curve Setup
Set pitch & throttle curve on your transmitter according to our suggestion;
14
B6 Tail Gyro
Make rudder correctly responding to your transmitter commands (rotating C.W. or rotating C.C.W.);
15
B7 Engine Governor
Both electric motor and gasoline engine require setting;
16
B8 R/C Transmitter Calibration
R,P,A&E
are required to do;
17
B9 SYSTEM CHECK
Check controller output, IMU mounting and battery performance;
18
C1 Digital Compass Calibration
Slide the control mode switch on transmitter 10 times, and WKH will enter the compass calibration mode;
20
C2 Manual Mode Test Flight
Please strictly follow the procedure during flight test, you may need to adjust the following parameters to achieve the best flight performance:
21
B3 Flybarless control parameters if youve enabled Flybarless;
13
B6 Tail Gyro sense;
15
B7 Engine speed and Gov Gain for Gasoline / Nitro engine.
16
C3 Fail-Safe
Please strictly follow the failed-safe setting procedure; otherwise this function might not be working correctly.
22
C4 Autopilot Test Fight
Please strictly follow the procedure during flight test, you may need to adjust the following parameters to achieve the best flight performance:
23
B10 Autopilot control parameters;
19
B3 Flybarless control parameters if youve enabled Flybarless;
13

Flight & Configuration Procedure Brief

Lite Assistant software of WKH and WKH Lite are different. However WKH Lite assistant software will become WKH assistant
software automatically with a GPS module plugged into MC when you open the assistant software.
©2012 DJI Innovations. All Rights Reserved. 10

Configuration Procedure

Assistant Software - MOUNTING page
STEP1: Select IMU Mounting orientation
STEP2: Fill in the distance between IMU/GPS and the C.G. of
helicopter in X, Y & Z axles, please measure the C.G. with following method:
a) Adjust your helicopter, and make it balance on X
and Y axle as shown below.
X
Y
Rotor Head
Balance on X Y
b) The C.G. should be on the extended line of
helicopter main shaft.
Main Shaft
Z
c) Hang the helicopter by the tail
and use a plum line to find C.G. on Z axle. You can use your own methods to estimate the C.G. of your helicopter.
*Step c) is not required to pod/boom, and scale helicopter. Simply enter value zero will be sufficient.
GPS normally mounted on tail boom, thus X and Z could be zero, distance between GPS to main shaft is X.
C.G.
Ground
Note: measurement in CM
1
You must re-configure if the ALL-UP-WEIGHT had been changed on your helicopter,
2
If mounting locations are not accurate enough or the sign were wrong, error on YZ axle will leads helicopter vibrating,
error on X axle will leads drifting during spinning.
STEP1
STEP2
Not showed in WKH Lite

B1 GPS & IMU Mounting

Lite WKH Lite customers can skip GPS mounting.
©2012 DJI Innovations. All Rights Reserved. 11 |

B2 Control Mode Switch

1
The transmitter you used must be Fail-Safe featured, which allows you to setup fixed outputs for all channels if the
receiver loses signals, otherwise WKH will not enable the Fail-Safe.
2
Working mode for your transmitter should be HELICOPTER.
3
All the channels in your transmitter should be working independently: NO CCPM, NO channel MIXNO EXP.
4
You need at least one 2 or 3-position switch on your transmitter to be set as the control mode switch.
In Assistant Software, page TX-MONITOR:
1
2
3
Once the switch position has been matched to specific control mode, you will see the high-light as shown following.
TX
Whichever 2 or 3 positions switch/channel user has
selected or decided to use in the transmitter (for control mode switching), in this case channel U marking on main controller. Use sub-trim or end-point (+/-) fine tuning on your transmitter, move the slider of channel U to the specific range until Assistant Software indicates that it is in Manual, GPS Atti., Atti.
and Failed-Safe mode. Notice: To move the slider is to adjust sub-trim or end-points of the channel selected.
Tx
1 2 3
3 Position
Switch
For 3-positions switch, you should assign:
Position-2to Atti. Mode; Position-1toManual Mode; Position-3to GPS Atti. Mode; Or reverse the assignment for Position-1 and Position-3.
For 2-positions switch, you should assign:
Position-1toManual Mode; Position-3to GPS Atti. Mode; Or reverse the assignment for Position-1 and Position-3.
Notice: Please see page 3 for introduction of autopilot control modes.
Set Fail-Safe output of receiver to input port-U, move the slider to the range which reads Fail-Safe MODE.
IMPORTANT: WKH would not execute Fail-Safe protection if you don’t set it properly. You can verify the Fail-Safe settings by shutting down your transmitter, and then you can use the following method to check whether WKH was already in Fail-Safe mode.
You can check the current control mode of WKH using either of the following methods:
Check the Assistant status bar at the bottom side of the
software interface.
Check the LED indicators status on GPS/Compass module,
see Appendix in this manual for details.
It will turn into Atti. in WKH Lite.
Lite WKH Lite customers have no GPS Atti. Mode.
©2012 DJI Innovations. All Rights Reserved. 12 |

B3 Flybarless

When system is powered on, you must not move your helicopter or sticks on transmitter until the system initialization is finished (about 5 second).
Once you changed the Flybarless to ON, the AILE and ELEV swash mix ratios in swashplate settings will be disabled, while [Direction Reverse] button will always be available for AILE and ELEV. After you have set the Flybarless to ON, you have to adjust your swashplate parameters before setting your Flybarless control parameters.
1
You have to adjust flybarless function and test it in Manual Mode first.
2
Don’t try to use Atti. Mode and GPS Atti. Mode until you can fly flybarless without any problems.
3
You might need to reduce the control gain of flybarless if you cannot make the helicopter stably hover or fly under Atti.
Mode, and GPS Atti. Mode.
Assistant Software, page-FLYBARLESS:
STEP1: Choose flybarless ON/OFF, you MUST NOT enable
flybarless function for helicopter with flybar, otherwise the helicopter will be out of control.
When Flybarless is turned on, elevator & aileron will have stabilization in manual mode.
STEP2: During test flight procedure, please perform the
following configuration procedure.
Gain Parameter range: 20% to 500% If the helicopter is sluggish, increase it; if the helicopter oscillate back after brake, decrease it. Adjust this parameter 10% increment time until your control feeling is sharp and the helicopter would not bounce after braking. Note: this parameter will only affect the stability but not control feeling.
Direct Input Parameter range: 30% to 300% This is the direct connect ratio for command stick effect, the rolling speed might not be uniform if it is too high, and also will lead to quick or sudden change in cyclic response.
Cyclic Rate Parameter range: 20 deg/s to 450deg/s This is the helicopter body rolling speed ratio, which determines the maximum rolling speed corresponding to command stick end point. The helicopter would response very quickly if it is too high, for example high rate in 3D.
Flybar Weight Parameter range: 20% to 300% The higher the value, the better the static stability of the helicopter. But, it will increases the sluggish on your control feeling, such as bank turn, and braking is also not sharp enough, like an large inertia helicopter. Similar to adding weight to blade tip.
ALIGN-600 Nitro (Default)
ALIGN-600Electric
LOGO 700
Maxi Joker 3DD
AILE
ELEV
AILE
ELEV
AILE
ELEV
AILE
ELEV
Gain
100
100
70
90
150
160
200
250
Direct Input
100
100
120
120
160
180
240
280
Cyclic Rate
180
180
150
150
150
150
130
130
Flybar Weight
100
100
80
80
130
130
150
150
STEP1
STEP2
Suggested Parameters
©2012 DJI Innovations. All Rights Reserved. 13 |

B4 Swashplate

You should finish the setup for your swashplate in Manual Mode.
In Assistant Software, page-SWASHPLATE:
STEP1:
TX
You have to set the transmitter to
single servo swash
(Futaba:H-1;JR/Spektrum:1sNORM;Hitec: 1-Servo 90°), and WKH will do the CCPM instead.
STEP2: Please make your selection according to your
swashplate type.IMPORTANT
STEP3: The swashplate can be rotated in 360°, with
1°step increase or decrease. Not required in most conditions.
STEP4: Click / button, you can reverse the
working Direction of swashplate servos. Servo Trim is in range -100 to +100, with default value at
0. The swashplate must be level. The Current Output will indicate whether your swashplate servos are on their center position or not.
If you have enabled Flybarless function, then Swash Mix ratio settings for AILE (Cyclic Roll) and ELEV (Cyclic Pitch) will not be available, please read Flybarless setting for detail.
Please read your helicopters manual, and make sure the swashplate servo linkage and all the mechanical parts were correctly adjusted before you use the above function for swashplate level adjusting.
Swash Mix is identical to Tx CCPM mixing, this function is no longer avaliable on Tx after set to single servo (on Tx).
STEP5: Click / button, you can reverse the
moving direction for PITCH (Collective Pitch), AILE (Cyclic Roll) and ELEV (Cyclic Pitch). The Swash Mix ratio is 0~100%, which defines the maximum working range for PITCH (Collective Pitch), AILE (Cyclic Roll) and ELEV (Cyclic Pitch), similar to Tx setting. Suggestion: 35~45%, it can give you soft flying movement, and easy to configure for the following parameters.
We suggest you to use the following pitch curve for better lifting power and safety descending speed.
Stick
Pos.
-100% 0% +100%
+10˚
-4˚
+5.5˚
0˚
Throttle curve for electric power, this is the example for JIVE ESC:
-100% 0% +100%
50
0
80
100
Stick
Pos.
Throttle curve for integrated engine (with governor function):
50
0
100
-100% 0% +100%
Stick
Pos.
STEP2
STEP3
STEP4
STEP5

B5 Pitch and Throttle Curve Setup

©2012 DJI Innovations. All Rights Reserved. 14 |

B6 Tail Gyro

When system is powered on, you must not move your helicopter or sticks on transmitter until the system initialization is finished (about 5 second).
Assistant Software, page-Tail Gyro:
STEP1: Please properly set your rudder servo type before you
connect your tail-gyro servo to it, otherwise your servo might be damaged due to incorrect servo type chosen.
Analog Servo(1520us @ Receiver Speed) Digital Servo(1520us165, 270, 333Hz),
Suggested servo type: JRDS8925HVFutaba S9254 Digital Servo(Digital-760us333,560Hz), Suggested servo type: Futaba BLS251 / BLS351.
STEP2: We have [Limit A] and [Limit B](Range:-140 to +140),
which represent end-points of the tail rotor pitch. The initial value for both is 50. Adjust these two limit value, make sure your rudder servo can work the full range for your tail rotor pitch, without any mechanical binding. Otherwise, the performance of the tail-gyro will be affected. You can identify which side of the tail rotor pitch is represented by Limit A / Limit B like this:
1. Set one of them to 0, another to 50.
2. Move your rudder stick on your transmitter.
3. One side of the tail rotor pitch will not move.
4. This side should be related to the Limit A / Limit B whichever you are giving value 0 to.
STEP3: Move your rudder stick, and check whether the tail rotor
pitch is working to your expected direction. If not, please change to proper direction.
TX
Transmitter related channels
Input
Operation
Description
R
Stick
Rudder command
G
Switch
1. Gyro working mode selection:
Rate Mode/Head-Locking Mode
2. Gyro sensitivity setting
3. Quickly slide it from rate mode to
head-locking mode for 3 times, the command stick center position would be reset.
You must also finish the SYSTEM CHECK procedure in later steps, before you fly your helicopter. You might find the Controller Output Check for tail rudder result in opposite rudder moving directions, click [Reverse] button to make corrections. Please see Page
错误!未
定义书签。
.
Rate Mode Head-locking Mode
G Channel Value
Gyro Sensitivity & Working Mode
0% 50% 100%
0% 50% 100%50%100%
50%100%
STEP4: Switch your Tail-Gyro working mode to [Rate Mode], take-off your helicopter and hover. If your helicopter drifts on YAW
direction obviously, then adjust your tail servo linkage until the helicopter stops drifting. Or you can use trim to fine-tune the rudder servo.
If you used trim during the Tail-Gyro working in Rate Mode, please power off the WKH and re-start it before you wish to use Head-Locking Mode.
STEP5: Gyro Sense setting: Set your gyro sense via transmitter, with the channel which you plug into input port-G on WKH main
controller. We suggest you start from 45% in [Head-locking mode], take off the helicopter, reduce the Gyro sense if tail got vibrating; if the tail response too slow and drift then increase it. Land you helicopter and switch to [Rate mode], then take off the helicopter again, fine-tune the rudder servo to make the tail stop drifting and land again. Switch the tail gyro between [rate mode] and [Head-locking Mode] by 3 times, then center position of Tx will be recorded, now you finished the gyro sense setting. You can identify the Tail-Gyro working mode on the status bar of Assistant Software, but that gyro sense percentage may not be the same as your Tx reading due to different Tx manufacture.
STEP3
STEP1
STEP2
©2012 DJI Innovations. All Rights Reserved. 15 |

B7 Engine Governor

In Assistant Software, page-ENGINE:
STEP1: Before using Governor Control mode, fine tune your
Gas/Nitro engine to good condition. Otherwise the performance would be negatively impacted.
STEP2: Select the operation mode:
Select [TX Control] for electric motor; For Gas/Nitro engine, select [TX Control] first, and finish
next step: set throttle servo working range. Then select
[Governor Control].
STEP3: SET throttle servo travel range, move the throttle stick to
For Electric
For Gas/Nitro
Click to set
Maximum open position
[SET-MAX]
lowest stick throttle
Engine idling position
[SET-IDLE]
Throttle hold
Cut position
[SET-STOP]
Notice: you must not turn on the throttle-cut.
STEP4: After three of the throttle positions being set, click
[TEST] button above to review your throttle working
range settings. Throttle servo will be forced to stay on each respective position for about 2 seconds. Repeat the [SET] procedure if it is not set incorrectly.
If a mistake is made, e.g, STOP position being set between MAX and IDEL, you will be notified by (Wrong), and Engine governor will be forced to work in [Tx Control] mode automatically.
STEP5: A third party engine speed sensor is required for the engine speed governor to function. We suggest using Futaba magnetic
engine speed sensor. You have to adjust the sensor/magnet mounting, and leave a proper space between the sensor head and magnet. You can check this with the percentage bar at page ENGINE, over 60% means the magnet is directly facing the sensor, and less than 2% means that the sensor is far from directly pointing at the magnet.
Notice: Only ONE magnet can be mounted on cooling fans of the engine.
STEP6: Please refer to user manual of your helicopter and engine, find the following parameters:
Main rotor speed, in range: 800 to 2500 RPM; main gear ratio, in range: 1.0 to 20.0; Engine RPM, in range: 6000 to 25000 RPM. (Will be calculated automatically )
STEP7: Gov Gain setting, range: 50% to 300%;
Suggestion:50% for Nitro engine; 150% for gasoline engine;
Governor STARTS to work in all of the following conditions:
throttle stick position is higher than 20% from cut-throttle; When engine speed has been raised above 70% of set RPM; When engine speed sensor works correctly.
Governor STOPS working in either one of the following conditions:
Throttle stick position lower than 10% from cut-throttle; Engine speed < 3000 RPM or sensor not working.
Time
Throttle Servo Position
Governor Start
Enter GPS Atti. or Atti. Mode
Enter Manual Mode
Governor Stop
Index
WKH THR out Tx Throttle
Governor Input
GPS Atti. and Atti. Modes takeover the throttle, pitch & cyclic positions at the point of switching from Manual mode. It is essentially how WKH knows to maintain throttle relative to rotor RPM, hence throttle hold or throttle cut switch will not cut the engine or motor. Unless, it is switched back to Manual Mode.
STEP2
STEP7
STEP6
STEP3
STEP4
STEP5
©2012 DJI Innovations. All Rights Reserved. 16 |

B8 R/C Transmitter Calibration

In Assistant Software, page-TX MONITOR:
TX
Totally 4 TX channels are required to be calibrate:
STEP1. Click [START] button, and move all of the sticks
throughout their complete range several times.
STEP2. Click [FINISH] button when you finished above
procedures.
1 You have to finish the throttle and pitch curve setting
before calibration, here the end-point of transmitter sticks will be record.
2 If the throttle or pitch end-point of transmitter had
been changed, please calibrate it again.
STEP1
©2012 DJI Innovations. All Rights Reserved. 17 |

B9 System Check

Controller Output Check
1
Switch to Non-Manual mode first.
2
Click [START] button, WKH will drive the swashplate going up and down, representing collective movement during flight.
3
Click [NEXT] button, WKH will drive the swashplate going forward and back, representing elevator movement during flight.
4
Click [NEXT] button, WKH will drive the swashplate going left and right, representing aileron movement during flight.
Up
1
Down
2
Up
3
Front
1
Back
2
Front
3
Right
Left
1
2
Left
3
5
Click [NEXT] button, WKH will drive the rudder, representing rotating C.C.W. and then C.W.
1
C.C.W.
1
C.C.W.
31
C.W.
32
6
Click [END] button or switch to Manual mode, Controller Output Check will be finished.
IMU Feedback Check
1
Switch to Atti. or GPS Atti.Mode first.
2
Click [CHECK] button.
3
Tilt the tail boom of the helicopter, the swashplate should respond to the opposite direction.
4
Tilt the helicopter body on its roll direction, the swashplate should also respond to the opposite direction.
5
Switch to Manual mode and finish the IMU Feedback Check.
1
If your helicopter was not responding as described above, you may be placing your IMU in a wrong orientation, or
you’ve select a wrong orientation for your IMU in Assistant Software. Please check sensor mounting again.
2
If the swash is not level (This is not critical), this can because by:
IMU is not level to AIR frame;  AIR frame and landing skids are not level to ground.
Battery Performance Test
1
Switch to Non-Manual mode first.
2
Make sure that your battery has at least 80% capacity left from being fully charged.
If the swashplate or rudder moves in opposite sequence, you should click reverse button / for correction. If the swashplate or rudder still doesn’t moves as your expected, it may cause by wrong connection between WKH main
controller and R/C Receiver, please also check the swashplate setting and Tail-Gyro setting.
You have to run the system check using Assistant software–System Check for WKH system to work properly:
Very important, check them carefully!
1
Click [START] button, WKH will force all the servos you connected and LEDs working at maximum payload, which will behave as
shaking swashplate and rudder. This will continue for 20 seconds and then stop automatically, you can force it stop by clicking [STOP] button, or switch to Manual mode.
2
Assistant Software will inform you the test result (LED will also blinking in yellow if you have it and failed condition was matched):
Failed, it means voltage drop below 3.5v, the battery or BEC were not be able to provide necessary power, please change it.
Test passed.
©2012 DJI Innovations. All Rights Reserved. 18 |

B10 Autopilot

In Assistant Software, page-Autopilot:
Base Parameters
Gain
Range: Front/back & Left/Right 40%~400%; Vertical 50%~250%
If too large, you will find the helicopter oscillating in the corresponding direction (About 5~10 times per seconds). If too small, the helicopter will likely to be hard to control.
Lite WKH Lite user can skip this section In GPS Atti. Mode, if helicopter drifting on front/back or left/right direction for
2~5 meters, then increase 10% on the corresponding direction it drifts to until the helicopter getting oscillation. If helicopter vibrate on its vertical direction, then reduce vertical parameter by 10% until it get stable. If altitude drop and drift happens during sharp braking, then increase I.D.R-Vertical in advance parameters.
Agility Range: 50%~200% It determines the start-up speed from command stick, the bigger the value the faster the reaction. Increase it for sharper and quicker leveling action after command stick released. The control feeling will be stiffness and rigid if the value is too high; and sluggish leveling action and slow braking if too small.
Stick Delay Range: 50%~200% It determines the overall stick reaction speed, for example: You push your roll stick to the maximum position your helicopter will tilt from leveling to 45 degrees, the smaller the number the quicker the transition.
Advance Parameters
The default values are suitable for most of the condition. DJI specialized guidance is needed if change is necessary.
Velocity Tracking: Range: Vertical 20.0%150.0% I: Range: Front/Back & Left/Right & Vertical 0%500%
Lite WKH Lite does not have I of Front/Back & Left/Right.
TX
Transmitter related channels
Input
Operation
Description
U
Switch
Control Mode Switch
G
Switch
Quickly slide it from rate mode to head-locking mode for 3 times, all the command sticks center position would be reset, see page 15 for tail gyro working mode setting.
P
Stick
Up/Down command from Tx
E
Stick
Front/Back command from Tx
A
Stick
Left/Right command from Tx
R
Stick
Rudder command from Tx
ALIGN600 Nitro
ALIGN 600Elec.
LOGO 700
Maxi Joker 3DD
JR GSR260
F/B
L/R
V
F/B
L/R V F/B
L/R V F/B
L/R V F/B
L/R V Gain
100
100
100
130
110
80
150
151
100
160
160
110
155
165
130
Agility
100
150
130
100
175
Stick Delay
100
110
135
185
166
Velocity Tracking
100
113
100
100
100 I 100
100
100
114
115
116
100
100
100
100
100
100
100
100
100
No these two items in WKH Lite
Suggested Parameters
©2012 DJI Innovations. All Rights Reserved. 19 |

Flight

Why calibrate the compass?
Ferromagnetic substances placed on helicopter or around its working environment will affect the reading of earth magnetic for digital compass, it also reduces the accuracy of the helicopter control, or even reads incorrect heading. Calibration will eliminate such influences, and ensure WKH system performs well in a non-ideal magnetic environment.
When to do it?
1
The first time you install WKH on your helicopter.
2
When the helicopter mechanical setup is changed:
a) If the GPS/Compass module is re-positioned. b) If electronic devices are added/removed/
re-positioned (Main Controller, servos, batteries, etc).
c) When the mechanical structure of the helicopter is
changed.
3
If the flight direction appears to be shifting (meaning the
helicopter doesn’t “fly straight”).
4
The LED indicator often indicates abnormality blinking
when the helicopter yaws. (It is normal for this to happen only occasionally.)
Where to do it?
Do the calibration in an open area, away from parked cars, metal railings, and any metal around. Sometimes a bunch of keys in your pocket might affect calibration.
Calibration procedure:
Tx
1 2 3
3 Position
Switch
STEP1: Enter calibration mode: quickly slide the control mode
switch from Position-1to Position-3 for 10 times, and LED indicator will be constantly on in blue;
STEP2: Calibration in horizontal: rotate you helicopter along with
the horizontal surface until the green light is on constantly, then go to the next step;
STEP3: Calibration in vertical: while green light is constantly on,
hold your helicopter vertically and rotate it along with its vertical axis, keep rotating until the green light is off, meaning the calibration is finished.
STEP4: After you finished the calibration, LED indicator will show
whether the calibration was successful or not:
If white light turns on for 3 seconds, calibration succeeds,
calibration mode will auto exit;
If red light keeps blinking quickly, the calibration has failed.
Slide the control mode switch one time to cancel current calibration, and then re-start from step 1 for re-calibration.
1
Don’t calibrate your compass where there is
strong magnetic interference, such as magnetite, car park, and steel reinforcement under the ground.
2
DO NOT carry ferromagnetic materials with you
during calibration, such as keys or cell phones.
3
You don’t need to rotate your helicopter on a
precise horizontal or vertical surface, but keep at least 45° difference between horizontal and vertical calibration.
4
WKH cannot be work in the polar circle.
If you keep having calibration failure, it might suggest that there is very strong magnetic interference around the GPS & Compass module, please avoid flying in this area.

C1 Digital Compass Calibration

Lite WKH Lite customers can skip this step.
©2012 DJI Innovations. All Rights Reserved. 20 |

C2 MANUAL MODE Test Flight

1
When the system is powered on, DO NOT moves your helicopter or sticks on transmitter until the system initialization is
finished (about 5 seconds).
2
Dont switch to Atti. Mode or GPS Atti. Mode during Manual Mode Test Flight. Go through this section first, and read
about how to do Autopilot Test Flight on Page 23.
1
Fly the helicopter. Trim transmitter such that the
helicopter hovers stably.
2
You have to adjust the following parameters to
achieve the best performance of your helicopter.
Flybarless parameters, if youve enabled
Flybarless, see Page 13 for details.
Tail Gyro sense, see Page 15 for details.  Engine speed, if you are using Gasoline /
Nitro engine, see Page 16for details.
3
Adjust Pitch curve on transmitter, so that the
helicopter hovers at about mid-stick.
4
Set correct fail safe output on all channels of
your R/C Transmitter/Receiver.
5
Verify Fail safe output of your transmitter on
status bar in Assistant Software. IMPORTANT!
STEP1: Check all the connection and wiring connected firmly, and
make sure they are in good condition;
STEP2: Make sure your batteries are fully charged for your
transmitter, WKH and all the devices on your helicopter;
STEP3: Turn on the transmitter first;
STEP4: Power on WKH and all the rest of electric devices on
helicopter, except brushless motor controller;
STEP5: Check the LED indicator, if red LED blinks quickly &
continually, then system start-up has failed; you have to place you helicopter horizontally and power on again. See Appendix for details about LED indicator;
STEP6: Slide the control mode switch on your transmitter to make
sure it is working properly. Check LED indicator to specify the current working mode. See Appendix for details about LED indicator;
STEP7: Others system failure and error will also be displayed by
LED indicator, See Appendix for details;
STEP8: If everything checked, and without any problems, switch
the system to Manual Mode, move all the sticks on your transmitter to check whether the helicopter is correctly responding to your commands;
STEP9: Start the engine or power on the brushless motor controller;
STEP10: Take-off and fly your helicopter in Manual Mode, before
switching to other modes.
The Fail-Safe (Auto Hovering or Level) has not been activated yet, goes through this section first and read about how to activate it on Page 22.
©2012 DJI Innovations. All Rights Reserved. 21 |

C3 Fail-Safe

1
The Fail-Safe (Auto Hover or Level) will not be activated, until youve correctly Pre-set Transmitter Command Stick
Center Position.
2
The Fail-Safe functions will not be working correctly if you have not finished the Auto Mode Test Flight. Please see
Autopilot Test Flight on Page 23 for details.
3
You must perform the following setting under Manual Mode.
4
If GPS signal reception is bad or you are using WKH Lite, auto level function will be triggered, but no position holding.
5
If you have already setup Fail-Safe successfully, then main rotor will start if you switch off Tx when your helicopter is
powered on.
In Assistant Software, page–Failed-Safe:
STEP1: Please configure your autopilot to the best condition,
make sure the helicopter can flight well under GPS Atti. Mode;
STEP2: Switch you WKH into Manual Mode;
STEP3: Please record your command stick positions which are
the same as the moment you switched from Manual Mode (if you changed throttle curve before switching,
use that curve for this setting). You will be asked to configure your transmitter, and let your helicopter able to hover with transmitter command stick roughly (Not to be exact) on their center position. You can read the [current stick position] which shown as number -1000
to +1000 in real time, click button, save them into [Confirmed]group as Tx center position.
You will be noticed by symbol instead of button, which means your throttle working range has not
been correctly set or your throttle position is holding on throttle-cut (STOP) position. Please check your throttle-cut switch and throttle working range setting in Assistant Software page–Engine. See page16 for details.
STEP4: Must check the confirm box that the Tx center position is correct, otherwise failed-safe will be disabled.
Fail-Safe functions are designed for GPS Atti. Mode and Atti. Mode. Once the helicopter is in the available transmitter signal range, switch to Manual Mode then you can re-gain the control right for WKH system. Lite WKH Lite user should mind that, once the helicopter is in the available transmitter signal range, you re-gain the control right for WKH Lite system whichever control mode you are in!
STEP3
STEP4
WKH can detect the fail safe output from your receiver, if you have pre-set fail safe output correctly. Once your helicopter lost signal from the transmitter, Fail-Safe function will control the helicopter automatically and save it in most of the conditions.
©2012 DJI Innovations. All Rights Reserved. 22 |

C4 Autopilot Test Fight

When system is powered on, you must not move your helicopter or sticks on transmitter until the system initialization is finished (about 5 second).
Please read this section before you switched to
Atti. Mode and GPS Atti. Mode
1 Make sure the GPS signal is good, without red LED
blinking.
2 Please avoid using WKH system in the following areas,
where will GPS signal is most likely blocked:
Urban area with crowded buildings  Tunnels  Under bridges
3 Make sure the attitude of helicopter is in good condition,
without white LED blinking.
4 Other system failures and errors will also be displayed
by LED indicator (see Appendix for details) or in assistant software.
5 If WKH has already acquired the GPS signal, you
cannot unplug GPS module directly without reboot and fly in GPS Atti Mode.
STEP1: Check all connections and wirings, and make sure they are
in good condition;
STEP2: Make sure your batteries are fully charged for your
transmitter, WKH and all the devices on your helicopter;
STEP3: Turn on the transmitter first;
STEP4: Power on WKH and all the rest of electric device on
helicopter, except brushless motor controller;
STEP5: Check the LED indicator. If red LED sparks quickly, the
system start-up has failed. You will need to place your helicopter horizontally and power on again. See Appendix for details about LED indicator;
STEP6: You may find red LED blinking, indicating that WKH is
getting GPS satellite signal, please wait until red LED is off, meaning WKH have found more than 7 GPS satellites, and that it can work in its best condition. See Appendix for details about LED indicator;
STEP7: Slide the control mode switch on your transmitter to make
sure it is working properly. Check it with LED indicator to specify the current working mode for WKH. See Appendix for details about LED indicator;
STEP8: Switch the system to GPS ATTi. Mode, if the swashplate is
not horizontal, please go back to 3rd step, and power cycle the system;
STEP9: Switch the system to Manual Mode, move all the sticks on
your transmitter to check whether the helicopter is correctly responding to your commands;
STEP10: Start the engine or power on the brushless motor controller;
STEP11: Take-off and fly your helicopter in Manual Mode;
STEP12: Hover your helicopter, and switch to GPS ATTi. Mode.
Semi-Auto take-off
Please setup B7 Engine Governor and all center positions correctly before you use this function. On STEP11, the system can perform Semi-Auto take-off feature rather than manual take-off. Please follow the operation procedures strictly:
1 Put the throttle stick on the lowest position; 2 Switch to GPS Atti. or Atti. Mode and wait until the
speed of main rotor is stable ;
3 Requiring only pushing the throttle (collective pitch) stick
gently to take-off the helicopter, autopilot system will be in charge of the cyclic pitch/roll stabilization.
Semi-Auto Landing
In GPS Atti. or Atti. Mode, with throttle (collective pitch) stick operation only, descend the helicopter and hold throttle stick on lowest position until the engine or electric motor is cutoff automatically. This throttle idle or shut-down in Auto mode when collective is lowest stick position only applies having this option.
1 With this option, MC will perform in GPS Atti. Or Atti. Mode for both takeoff and landing.
2 Make sure use this function only when the GPS signal is
sufficient and at open area!
3 When you are using semi auto take off, switch into
autopilot modes and move throttle stick, main rotor will start!
Do NOT move any stick when switching!
WKH Test Flight (Lite WKH Lite user should skip this section to WKH Lite Test Flight section on next page)
WKH Lite Test Flight
©2012 DJI Innovations. All Rights Reserved. 23 |
When system is powered on, you must not move your helicopter or sticks on transmitter until the system initialization is finished (about 5 second).
Please read this section before you switched to
Atti. Mode
1
Put helicopter on the plane ground.
2
System failures and errors will also be displayed by LED
indicator (see Appendix for details) or in assistant software.
STEP1: Check all connections and wirings, and make sure they
are in good condition;
STEP2: Make sure your batteries are fully charged for your
transmitter, WKH and all the devices on your helicopter;
STEP3: Turn on the transmitter first;
STEP4: Power on WKH and all the rest of electric device on
helicopter, except brushless motor controller;
STEP5: Check the LED indicator. If red LED sparks quickly, the
system start-up has failed. You will need to place your helicopter horizontally and power on again. See Appendix for details about LED indicator;
STEP6: Slide the control mode switch on your transmitter to make
sure it is working properly. Check it with LED indicator to specify the current working mode for WKH. See Appendix for details about LED indicator;
STEP7: Switch the system to ATTi. Mode, if the swashplate is not
horizontal, please go back to 3rd step, and power cycle the system;
STEP8: Switch the system to Manual Mode, move all the sticks on
your transmitter to check whether the helicopter is correctly responding to your commands;
STEP9: Start the engine or power on the brushless motor controller;
STEP10: Take-off and fly your helicopter in Manual Mode;
STEP11: Hover your helicopter, and switch to ATTi. Mode.
Semi-Auto take-off
Please setup B7 Engine Governor and all center positions correctly before you use this function. On STEP10, the system can perform Semi-Auto take-off feature rather than manual take-off. Please follow the operation procedures strictly:
1 Put the throttle stick on the lowest position; 2 Switch to Atti. Mode and wait until the speed of main
rotor is stable ;
3 Requiring only pushing the throttle (collective pitch) stick
gently to take-off the helicopter, autopilot system will be in charge of the cyclic pitch/roll stabilization.
Semi-Auto Landing
In Atti. Mode, with throttle (collective pitch) stick operation only, descend the helicopter and hold throttle stick on lowest position until the engine or electric motor is cutoff automatically. This throttle idle or shut-down in Auto mode when collective is lowest stick position only applies having this option.
1 With this option, MC will perform in Atti. Mode for both
takeoff and landing.
2 When you are using semi auto take off, switch into
autopilot modes and move throttle stick, main rotor will start!
Do NOT move any stick when switching!
©2012 DJI Innovations. All Rights Reserved. 24 |

Maintains

After firmware upgrade, please re-configure WKH using Assistant software.  If it is notified that the network or DJI server is busy, please try again later with above procedures.  If firmware upgrade failed, WKH will enter <waiting for firmware upgrade status> automatically,
please try again with the above procedures. Note: You will be asked to fill out contact information/register as user prior to any upgrades
Software version
Firmware version
IMU version
Hardware ID
If you filled in the invalid S/N over 30 times, your WKH will be locked and you have to contact our customer support.

Firmware Upgrade

Please strictly follow the operation procedure for firmware upgrade, otherwise WKH might not work properly:
1.
Make sure your computer is connected to the Internet.
2.
Please close all the other applications during the firmware upgrade, including Anti-virus software and firewall.
3.
Make sure the power supply is securely connected. DO NOT un-plug the power supply until firmware upgrade has finished.
4.
Connect main controller to PC with micro-USB cable, DO NOT break connection until firmware upgrade is finished.
5.
Run Software and wait for connection.
6.
Select [TOOL][Firmware Upgrade].
7.
DJI server will check your current firmware version, and get the latest firmware prepared for the unit.
8.
If there is a firmware version more up-to-date than your current version, you will be able to click the upgrade button.
9.
Wait until Assistant software reads “Finished.
10.
Please power cycle the unit after at least 5 seconds.
11.
Your unit is up-to-date now.

Product Info

You can check the WKH product version via [ABOUT][Info].
[S/N] is a 32 digits authorization code for unit function activations. We had already filled in the authorization code for your unit after
manufacture. You might be asking to fill in the new [S/N] in the future if you brought new function upgrades.
Fill-in the [S/N] and then click [Write] button.
©2012 DJI Innovations. All Rights Reserved. 25 |

Appendix

Flight States
Manual Mode
Atti. Mode
GPS Atti. Mode
Tx Signal Lost
GPS satellites found <5
GPS satellites found <6
GPS satellites found <7
Attitude & GPS good
Attitude status fair
Attitude status bad
IMU lost, check IMU connection.
<3.5V low voltage, replace battery!
<4.4V low voltage, replace battery!
Notices: Here the sparking indication of & could be: Single spark, all the sticks return to center, helicopter hovering; Double spark, stick(s) not at center, speed command is not zero.
Compass Calibration Status
Begin horizontal calibration
Begin vertical calibration
Calibration finished
Calibration or others error
Flight States
Manual Mode
Atti. Mode
Tx Signal Lost
Normal state
IMU lost, check IMU connection.
<3.5V low voltage, replace battery!
<4.4V low voltage, replace battery!
Notices: Here the sparking indication of could be: Single spark, all the sticks return to center, helicopter hovering; Double spark, stick(s) not at center, speed command is not zero.

WKH LED Indicator Description

WKH Lite LED Indicator Description

©2012 DJI Innovations. All Rights Reserved. 26 |

Product Specifications

General
Built-In Functions
Autopilot
Tail Gyro
Engine Governor for gas power
Flybarless
Auto Hover or Level Fail Safe  Semi Auto Takeoff & Landing
Peripheral
Supported Helicopter Types
Electric  Internal combustion
Supported Swashplate Types
Normal  Three Servo 120°/140°/90°  Four Servo 90°
Supported Servo output
Rudder channel: Analog 50Hz  Rudder channel: Digital 333-560Hz (760us-1520us)  Other channels: Follow on your receiver output
Recommended Transmitter
PCM or 2.4GHz with minimum 7 channels and failed-safe function available on all channels.
Recommended Power Supply
DC 4.88.4V (Not to exceed MAX operating voltage of servo motor); >1500 mAh capacity, Discharge current more than 5C;
7.5A to 15A external BEC, servos dependent
Assistant Software System Requirement
Windows XP SP3 / 7
Electrical & Mechanical
Power Consumption
MAX 5W (0.9A@5V, 0.7A@5.8V, 0.5A@7.4V, 0.4A@8V)
Operating Temperature
-5°C to +60°C
Total Weight
<= 150g (overall)
Dimensions
MC: 51.2mm x 38.0mm x 15.3mm
Lite GPS/Compass is NOT in WKH Lite
IMU: 41.4mm x 31.1mm x 27.8mm
GPS & Compass: 50mm (diameter) x 9mm
LED Indicator: 25mm x 25mm x 7mm
Flight Performance (can be effected by mechanical performance and payloads)
Hovering Accuracy (GPS Mode)
Vertical: ± 0.5m
Lite NOT with WKH Lite
Horizontal: ± 1m
Maximum Wind Resistance
<8m/s (17.9mph / 28.8km/h)
Forward / Backward Speed
±72km/h (44.74mph)
Left / Right Speed
±56.7km/h (35.77mph)
©2012 DJI Innovations. All Rights Reserved. 27 |
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