Futaba GV-1 User Manual
GOVERNOR FOR MODEL HELICOPTER
GV-1
INSTRUCTION MANUAL
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Thank you for purchasing a Futaba GV-1 governor.
To ensure safe use, please read this manual thoroughly before
using your new governor. After reading this manual, store it in a
safe place.
FOREWORD
The GV-1 is an engine governor for model helicopters.
The governor automatically maintains constant rotor R.P.M.due
to load changes (reaction to torque) by suppressing variations in
the engine speed. The GV-1 works very well in all maneuvers,
from hovering to flying.
-Engine speed can be set from both the GV-1 and the transmitter.
-A magnetic sensing system reads the engine speed.
-Fuel mixture control can be set.
-An LCD panel displays the engine speed and set data.
-No part of this manual may be reproduced in any form without prior permission.
-The contents of this manual are subject to change without prior notice.
-This manual has been carefully written. Please contact Futaba if you feel that any corrections or clarifications should be made to the contents of this manual.
-Futaba is not responsible for the results of use of this product by the customer.
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TABLE OF CONTENTS
PRECAUTIONS 6
Definition of symbols 6
Setting precautions 7
Operating precautions 9
BEFORE USE 10
Set contents 10
Nomenclature 11
Overview of GV-1 operation 12
Examples 14
ASSEMBLY & ADJUSTMENT 16
Mounting the magnet and sensor 16
GV-1 connections 21
Fuselage setting precautions 22
FUNCTIONS 24
LCD display and edit keys 24
Low battery alarm 24
Function map 25
Initial setting for governor operation 26
Description of functions 33
REFERENCE 47
Specifications 47
Glossary 48
GV-1 PARAMETERS SHEET 49
REPAIR SERVICE 50
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PRECAUTIONS
To ensure safe use, please observe the following precautions.
Definition of symbols
Pay close attention to the parts of this manual indicated by the following sym-
PRECAUTIONS
bols.
Symbol
Graphic symbols
; Operations that must not be performed.
; Operations that always must be performed.
Meaning
Indicates a procedure that could result
in serious injury or death to the user or
other persons if ignored and not performed properly.
Indicates a procedure that could result
in death or serious injury to the user or
other persons, as well as physical
damage, if ignored and not performed
properly.
Indicates a procedure that may result
in serious injury to the user or other
persons, or physical damage only, if ignored and not performed properly.
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Setting precautions
When using the GV-1 for the first time, or when making
changes in the throw of a servo, always perform the limit
setting operation.
(Setting method: Page 45)
Always set battery fail safe function at the GV-1.
(Setting method: Page 44)
Since the GV-1, when used, controls the throttle, the battery fail safe function
that is in a PCM transmitter will not be used.
Because the GV-1 controls the throttle, the throttle channel
fail safe function normally set in a PCM transmitter will not
be used. Set the fail safe function as described below.
Transmitter setting
Use the fail safe function for the channel that turns the governor on and
off to set the fail safe position to the point at which the governor is
turned off. With this setting, when the system enters the fail safe state,
the governor will be turned off and the receiver throttle signal will be
output directly.
PRECAUTIONS
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The center of the sensor is
2.2
mm
3.7mm 3.7mm
Center of sensor
is offset.
Sensor
case
different from the center of
the sensor case so be careful
when mounting the sensor.
(Setting method: Page 16)
PRECAUTIONS
When using the PCM1024Z transmitter
When using the condition hold (CHD) function, always set the
throttle servo maximum operating point (MAX THR) to 20% or
less.
Depending on the conditions, this setting will turn on the governor and
prevent the engine from exceeding the set speed even when condition
hold is set.
(Governor ON conditions)
The following conditions must be performed, to turn on the
governor:
-Governor ON/OFF switch set to ON position.
-Throttle stick set to 20% or more from slow position.
-Engine speed raised to 70% or more of set speed.
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Operating precautions
At the beginning of flight, keep the governor in the OFF
state by setting the throttle stick to no more than 20% from
the slow side.
While the engine is running, turn on the governor at the point which the throttle
stick is at least 20% from the slow side and the engine speed exceeds 70% of
the set speed.
When the model is on the ground, lower the pitch to the
position at which the model does not try to lift off. Do not
take your eyes off the model.
When the governor operates and the rotor speed increases the lift also increases causing the model to try lift off , depending on the pitch position.
Periodically check the sensor output.
(Check method: Page 46)
The magnet rotates at high speed and is subjected to a large centrifugal force.
Check the sensor output and mounting state about once every 10 flights.
If the model begins to shake during operation, immediately
turn off the governor.
(See "Governor on/off operation mode setting" on page
29.)
PRECAUTIONS
When engine speed is not stable at high R.P.M.'s
The carburetor design, etc. may cause the engine to operate
unstable. If this occurs, lower the maximum speed setting to the
range over which there is no problem.
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BEFORE USE
Set contents
Immediately upon opening the carton, check if the following items are supplied.
GV-1 control amp
Magnet
BEFORE USE
GV-1 magnetic sensor
1010
10
1010
Seal
SENSOR
& Sx
Tx
GV-1
THRO MXTR
SENS.
r.p.m 1 r.p.m 2 r.p.m 3
m.trim GOV on GOV off
on / off
r.p.m THRO
m.trim
Miniature screwdriver
Sensor mounting stay
For 30 engine
For 60 engine
Sensor mounting screws
SENSOR
THRO MXTR
r.p.m 1 r.p.m 2 r.p.m 3
m.trim GOV on GOV off
on / off
Tx
GV-1
& Sx
SENS.
r.p.m THRO
m.trim
Nomenclature
Control amp
LCD display panel
Displays the speed and set data.
Sensor connector
Servo connectors
Edit keys
Receiver connectors
Used to set data. Press with the accessory miniature
screwdriver.
LCD contrast trimmer
The display contrast can be adjusted so that the LCD display is easy to
read. Adjust the contrast with the accessory miniature screwdriver.
Seal
Stick this seal to the sensor and servo connectors, transmitter switch, etc.
BEFORE USE
1111
11
1111
Overview of GV-1 operation
The GV-1 operates from 1000 to 2100rpm main rotor speed . However, the
engine must be running at the set speed. The GV-1 turns off the governor
when the engine is starting or idling.
*Governor operation = Operation that stabilizes the engine speed at the set speed.
When governor turned on and off by switch (Normal
condition)
Setting the switch to the ON position turns on the governor. The following
describes this operation.
-Throttle stick set at least 20% from slow position and engine running at 70% or more of set
BEFORE USE
Governor can be turned
on and off by a switch.
When governor turned on and off by transmitter
throttle stick
The data is set so that the governor can be turned on and off with the transmitter throttle stick. The following describes this operation.
100%
15% or less
(OFF region)
(OFF at slow side)
0%
speed ->->-> ON
-Throttle stick set to maximum slow position ->>-> Remains ON
-Switch set to off position ->->-> OFF
-Throttle stick set at least 20% from slow side
and engine running at 70% or more of set
speed ->->-> ON
-Throttle stick held at 15% or more from slow
side ->->-> Remains ON
-Throttle stick lowered 15% or more from slow
side ->->-> OFF
(Governor operating point)
1212
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1212
Set speed
20% or more of stick deflection
and 70% of set speed
For safe operation, do not turn on the governor under the conditions
shown below. If satisfied while the governor is on, the following conditions will forcibly turn the governor off.
When the governor is off, the transmitter throttle stick controls the
throttle servo.
-Engine started while governor switch in ON position.
-Engine speed is 70% or less of set speed and throttle stick is set to
20% or less from slow side after engine started (governor starting
only).
-Speed set to 999rpm or less (OFF setting).
-Stick signal is lower than stop position setting.
-Engine stopped, or sensor signal abnormal.
-Throttle stick set 15% or less from slow side (only when function
that turns governor on and off by stick is set).
The following operations do not indicate trouble:
(When engine speed rises above the set speed)
A near-vertical dive may cause the engine speed to rise above the
set speed.
(Throttle operation speed and ON/OFF point)
If throttle operation exceeds 70% of the set speed and the rotor
speed rises to the set value, the ON/OFF point may seem to differ
with the operating speed. Delay operation to smoothen the switching operation causes this and does not mean that the ON/OFF point
has changed.
BEFORE USE
(Deviation from set speed)
The GV-1 stabilizes the engine speed to within +1% of the set
speed. For example, if the rotor R.P.M. is set to1500rpm, the Rotor
R.P.M. speed will deviate about +15rpm. However, this poses no
problem from the standpoint of practical use.
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1313
1
2
3
F
N
F
F
Examples
The GV-1 functions can be selected to match the transmitter used.
Select the functions by referring to the examples shown below.
Speed
switching
Three
positions
CH7(example)
Example 1
BEFORE USE
When used with PCM1024Z
Two positions
CH7(example)
When used with FF8 or PCM1024Z
Example 2
Two positions
CH7(example)
Example 3
When used with FF8 or PCM1024Z
Function
Governor
on/off
OF
O
ON/OFF
CH8(example)
Speed
1
switching
OF
position 1
3
used
(without mixture function)
Speed
OF
switching
2
position 1
3
used
control used
(with mixture function)
Mixture
function
None
None
Mixture
Connection
Sx
Rx
Sx
Rx
Sx
Rx
Throttle servo
Not connected
2P switch channel
3P switch channel
Throttle channel
Throttle servo
Not connected
Not connected
3P switch channel
Throttle channel
Throttle servo
Mixture servo
Volume channel
3P switch channel
Throttle channel
1414
14
1414
F
N
Speed
switching
Function
Governor
ON/OFF
Mixture
function
Connection
None None
Speed set at
governor side.
OF
O
on/off
Example 4
None None
Speed set at
governor side.
ON/OFF
Throttle stick
Example 5
When there is no vacant channel
Sx
Rx
Sx
Rx
Throttle servo
Not connected
2P switch channel
Not connected
Throttle channel
Throttle servo
Not connected
BEFORE USE
Not connected
Not connected
Throttle channel
1515
15
1515
ASSEMBLY & ADJUSTMENT
Mounting the magnet and sensor
Modify the cooling fan and install the accessory magnet and attach the magnetic sensor to the engine at the position shown below.
Cooling fan
ASSEMBLY & ADJUSTMENT
Magnet and sensor mounting
Offset the sensor
center position.
2.2
mm
3.7mm 3.7mm
Magnet (Embedded in cooling fan.)
Sensor (Attached to engine
flange through a stay.)
When installing the sensor
magnet to the muffler side,
also refer to the needle side
mounting.
Sensor case
Align the sensor center position and the
center of the magnet shown in the figure
at the left.
Sensor center position
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1616
The sensor and stay mounting directions depend on the
sensor mounting position.
Direction of mounting the
sensor to the stay.
Magnet
Distance from center
of engine shaft
Cooling fan
Magnet mounting position
Magnet mounting method
The tables below show the magnet mounting position (example) for each engine.
60 engine
Mounting
position
Distance from
center of
engine shaft
Mounting
position
30 engine
Distance from
center of
engine shaft
Needle side Needle side
With a Kyosho 60 helicopter, do not use a stay. Mount the sensor directly to the
helicopter frame.
27.1-28.8mm
22.0-24.0mm
ASSEMBLY & ADJUSTMENT
1717
17
1717
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