Compass Atom 7HV User Manual
Introduction
Congratulations on your purchase of the Compass Model Atom 7HV Electric Powered Helicopter. This model has been
designed using the latest in state-of-the-art design technology. To achieve the best performance and reliability from this
model, please read through these instructions carefully so you become familiar with the contents of this kit before assembly.
AMA Information
We strongly encourage all prospective and current R/C aircraft pilots to join the Academy of Model Aeronautics. TheAMAis
a non-profit organization that provides services to model aircraft pilots. As an AMA member, you will receive a monthly
magazine entitled Model Aviation, as well as liability insurance plan to cover against possible accident or injury. All AMA
charter aircraft clubs require individuals to hold a current AMA sporting license prior to operation of their models. For
further information, you can contact the AMA at:
Academy of Model Aeronautics
5151 East Memorial Drive
Muncie, IN47302
Warning
The radio-controlled model helicopter contained in this kit is not a toy, but a sophisticated piece of equipment. This product
is not recommended for use by children. Radio-controlled models such as this are capable of causing both property damage
and/or bodily harm to both the operator/assembler and/or spectator if not properly assembled and operated. Compass
Model Ltd. assumes no liability for damage that could occur from the assembly and/or use/misuse of this product.Although
the Atom 7HV is powered by a quiet, smooth-running electric motor, it should be assembled and operated with the same
care as glow engine helicopters. When operating your Atom 7HV, please exercise caution and safety.
Warranty
The warranty covers defects in material or workmanship or missing components to the original purchaser for 30 days from
the date of purchase. Compass Model Ltd. will replace or repair, at our discretion, the defective or missing component.
Defective components must be returned to our Distributor prior to replacement.
Any part, which has been improperly installed, abused, crash damaged or altered by unauthorized agencies is not covered.
Under no circumstances will the buyer be entitled to consequential or incidental damages. The components used in this kit
are made from special materials designed for special applications and design strengths. We recommend that all replacement
parts be original parts manufactured by Compass Model Ltd. to ensure proper and safe operation of your model. Any part
used which was manufactured by any firm other than Compass Model Ltd. VOIDS all warranties of this product by Compass
Model Ltd.
Warranty Procedures
Mail all warranty information within 15 days of original purchase date. If service is required, send the component in
question (if not missing) together with a photocopy of your bill of sale and an accurate description of the problem and part.
Ship components fully insured and prepaid. Compass Model Ltd. is not responsible for any shipping damages. We will, at
our discretion, notify you of any costs involved, or ship it COD. You are required to pay all postage, shipping and insurance
charges.
R/C Helicopter Safety
A model helicopter must be built exactly in accordance with the assembly instructions. Compass Model Ltd. has spent much
time and efforts refining this product to make it reliable in operation and easy to build. Vibration and stress levels are high and
all fasteners and attachments must be secure for safe operation. Safe operation is the responsibility of the builder/flyer and
starts with careful construction and continues with selection and installation of reliable radio equipment and motor/engine.
The need for safety is nowhere greater than at the flying field. A number of guidelines for safe flight have been developed by
experienced flyers and are set down here. It is urged that they be read, understood and followed.
Attention:
rules to apply in your country/Flying field.
each country has its own security application which cannot be laid down here so prior to any flight request the
Atom 7HV LimitationsAttention :
Atom 7HV Max. rotor head rpm: 2100 U/min
Atom 7HV Max. collective pitch range: +/- 12°
Guidelines for Safe R/C Helicopter Flight
• Fly only at approved flying fields and obey field regulations.
• Follow frequency control procedures. Interference can be dangerous to all.
• Obtain assistance from experienced pilots.
• The Guidance provided by experienced pilots is valuable and sometimes necessary.
• Know your radio. Check all transmitter functions before each flight.
• Be aware that rotating blades are very dangerous and can cause serious injury or even death.
• Never fly near or above spectators other modelers or animals.
• Do not fly r/c helicopter models near buildings, high voltage cables, trees or other obstacles.
• If you are a beginner, get help trimming and adjusting the model before you start the flight training.
• Don’t “track” the main blades by holding the tail boom. This is a temptation to builders who cannot hover yet and is very dangerous.
• Follow all recommended maintenance procedures for model, radio and motor.
• Only turn off the radio after the brushless motor is disconnected.
Necessary Items
In order to operate this model, you need to purchase the following items not kit-included.
6 channel or up radio and receiver.
3 standard servos.
1 rudder servo.
1 Flybarless Unit
1x LiPo Battery 12S or 2 6s Packs
1x HV BEC or Receiver Battery
Main Rotor
Length: up to 710mm
Hex Wrench Set
(1.5mm,2mm,2.5mm,3mm, 5mm)
Threadlock
Cutter Knife
BEC
Grease
Needle Nose Pliers
Standard Servos
Bearing Retainer
Phillips Screw Driver
Pitch Gauge
Ball Link Sizing Tool Ball Link
Swash Plate Tool
Plier
Pre-assembly Information
When first opening your Atom kit, you will notice that all of the parts are packaged and numbered to coordinate with the
assembly step numbers of this instruction manual. All small hardware (nuts, bolts, washers, etc.) for each step are packaged
separately within the main parts bags. When beginning a section, you will need to open only the bag with the corresponding
number to the section you are about to start. It is suggested that you place all of the hardware in an open container (e.g., servo
case) during assembly so as not to lose any of the small parts. It may also be helpful to familiarize yourself with the various
sizes of screws, bolts, nuts, etc., as illustrated in the appropriate assembly section before you begin assembly. In most cases, at
the end of each assembly section, there should be no parts remaining. Great care has been taken in filling the bags with the
correct quantity of parts and hardware for each section. However, occasional mistakes happen. In the event that you find a
parts shortage or are in need of technical assistance, please contact your local Compass Model parts dealer.
In The Box
This model is packed according to assembling steps. Do not open all the bags at one time.
Open only one bag for each step of assemply when building.
Frame Set
Step 3 Tail Set Step 4
Motor Set
Step 1 Step 2
Rotor Set
Swash Set
Linkages
Blades
Canopy
Symbols & Assembling
Mishandling due to failure to follow these instructions may result in damage, personal injury or danger.
Use Blue Threadlock
G
Use Grease
A
B
Use AB Glue
Use Bearing Retainer
* Always apply blue Threadlock when fixing Bolts on Metal parts.
* Always apply green retainer where bearings has to be fit into metal parts.
* Do not over-tighten self tapping screws into plastic parts or you will strip the threads!
1
Pos Description Qty
1 M2.5x10 Socket Head Bolt 12
1 M2.5x12 Socket Head Bolt 12
2 M2x8 Socket Head Bolt 4
3 Stainless Ball 4
4M2Nut 4
5ServoBolt 4
6 Servo Spacer 2
7 M2.5x20 Socket Head Bolt 4
8ServoNut 2
9 2.5mm Washer 12
Servo
Use medium threadlock on all
screws going into metal parts
Swashplate Servo
0
10
1
9
1
30
20
40
Installation
For mounting the swashplate servos to the bearing blocks, tighten all bolts of the upper bearing block
with medium threadlock. Fix the servos at the upper bearing block. Install the main shaft through all
bearing blocks and push the middle bearing block up against the bottom of the cyclic servos. Tighten the
four screws in the X-shaped parts that secure the middle bearing block. Now slide the main shaft up and
down to make sure the bearing blocks are all aligned. If the main shaft doesn't slide freely, loosen the
screws of the bearing blocks and tight them in a cross pattern. The bearing blocks must be aligned
parallel to each other. You can control this by comparing the height of the bearing block in the long holes
of the side frame. Do not forget to apply new threadlock when loosened a screw!
2
3
4
5
1
The Servo installation is done without
the supplied Servo Rubbers. If you
want to use the Rubber, please use
M2.5x12 Bolts, instead of M2.5x10.
Remove the black cap of the canopy standoff to loosen
and tighten the screw for adjusting the bearing block.
Use these long holes to adjust
the middle bearing block to fit
different servos.
Pos Descripti on Qty
1 M3x20 Socket Head Bolt 8
2 3mm Washer 8
3 3x5mm Set Screw 4
4SkidCaps 4
Tail Servo
Installation
9
Tip: Do not over tighten the four servo
screws as it may damage the plastic parts.
6
7
8
2
A
B
Use AB Glue
Landing Gear
Use medium threadlock on all
screws going into metal parts
0
10
30
20
Tip: Do not over tighten the four 3 x 5mm
set screws as it can damage the landing
struts.
40
1
3
A
2
1
B
4
3
Pos Description Qty
1 M3x75 Socket Head Bolt 4
2 3mm W asher 11
3M3NylonNut 8
4 M3X16 Socket Head Bolt 2
5 M3X25 Socket Head Bolt 3
6 M3X10 Socket Head Bolt 3
7 Boom Support Collar 2
8 M2.5X6 Socket Head Bolt 2
Slide the tail case completely onto the boom, align it to
the Compass writing and fix it with the clamp on the rear
side. The two locking bolts ( 8 )must be screwed
completely into the case to pierce the boom. After this
step, the angle of the writing can not be adjusted any
more!
Boom & Tail Rotor
Use medium Threadlock on all
screws going into metal parts
0
10
To pull the belt through the tail boom, slide a cord through
the boom and fix the belt very carefully at the cord. You can
also use a strand and bend a hook at one of the ends.
Crimping the belt damages the
tensile cords and will result in
premature failure!
30
20
40
Tip: Do not tighten the bolt of the belt
idler pulley yet, it will be adjusted later.
6
Tip: You can use a very small drop of thin
CA glue to secure the pin in the tail pulley.
3
4
Be careful not to over tighten the
bolts when attaching the tail rotor
blades. The tail blades should be
able to move with a slight amount
of resistance within the tail blade
holders.
8
3
Take special care to get the boom long
enough into the tail assembly for correct tail
length before you tight this bolt.
6
2
2
3
Boom & Tail Rotor
Tip: Slide the tail boom clamp over the
boom. Unscrew one of the ball links on the
tail control rod. Screw it back on the
control rod after installing it.
Tip: Just instal l the screw, struts and nut
temporary without tightening them to
much.
0
10
3
5
30
20
40
Twist the tail belt 90° to the
right before inserting it
between the idler pulleys.
Slide the Tail Boom through the tail
boom mount and between the idler
pulleys
Do not crimp the tail belt and
be sure that it is not turned in
the wrong direction or more
1
2
3
2
Use medium threadlock on all
screws going into metal parts
The boom support collar (7)
has one beveled side. This
must face outside. Be careful
when fixing the tail boom
braces and arrange the
collars to them.
7
2
Beveled Side
5
Tip: Clip on the ball link on the tail
control arm. Look which part of the tail
control rod slides in the guide of the tail
boom clamp to get the correct position for
the heat shrink. Clip it off again and pull
the tail control rod as far as possible to the
rear. Slide the heat shrink over the tail
control rod and shrink it carefully with a
lighter.
Heat Shrink Plastic
m
m
0
3
1
4
Pos Description Qty
1 Main Shaft Clamp 1
2 M2.5x 10 Soc ket Head Bolt 1
3MainShaft 1
4 M3X30 Sock et Head Bolt 1
5M3NylonNut 1
6 M4x10 Socket Head Bolt 2
Main Gear
rim
0
10
20
Use medium threadlock on all
screws going into metal parts
3
30
40
Do not over
tighten the screw
in the main shaft
clamp, but fix it
securely.
8.5mm
After installing the main
11mm
1
gear, mount the main
shaft clamp below the
upper bearing block with
the rim facing towards
the bearing. Push the
main shaft down and the
main shaft clamp up. The
must be zero clearance.
1
2
5
If you have to change the main gear, do not
overtighten the bolts going into the hub or it may
draft the main gear. Tighten the bolts in a cross
pattern.
4
To intall the main gear, push the tail boom all the way in.
Pull the tail belt out at one side of the chassis and mount it
on the main pulley. Then slide the main gear into the frame
and align the holes over each other to fit the jesus bolt.
6
2 extra M4x10 Bo lts are
equipped here in case for
optional motors.
4mm slot
To mount Motors with different hole measurements, use 2 of
the 4 slots in the motorplate. The 4mm slots for motors with
M4 screws and th e 3mm slots for motors with M 3 screws.
Only 2 screws are necessary in this case.
3mm slot
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