Compass 3D Plus Nitro Powered Helicopter User manual

2.1
05/20/2010

Academy of Model Aeronautics
5151 East Memorial Drive
Muncie, IN47302
Introduction
Warning
Warranty
AMA Information
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.
We strongly encourage all prospective and current R/C aircraft pilots to join the Academy of Model Aeronautics. The AMA is
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:
Congratulations on your purchase of the Compass Model 3D Plus Nitro 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.
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.
Each flying field has its own sets of safety guidelines which cannot be expressed here, so prior to any flight, refer
to the guidelines at your Flying Field.
Attention:
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. The 3D
Plus is a large glow powered model, it should be assembled and operated with special care. When operating your 3D Plus,
please exercise caution and safety.

• Fly only at approved flying fields and obey field regulations.
• Follow frequency control procedures. Interference can be dangerous to all.
• Obtain guidance from experienced pilots.
•
• Know your radio. Check all transmitter functions before each flight.
• Be aware that rotating blades are very dangerous and can cause serious injury.
• Never fly near or above spectators or other modelers.
• Do not fly r/c helicopter models near buildings, high voltage cables, trees or other obstacles.
• If a beginner, get help trimming the model first and flight training later.
• 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 engine is shut down.
The guidance provided by experienced pilots is often valuable and sometimes necessary.
Necessary Items
Bearing Retainer
At least a 6 channel radio and receiver
4 standard servos.
1 gyro with rudder servo.
5V receiver battery
or 2 cell li-po battery with a regulator.
Grease
Needle Nose Pliers Screw Driver
Hex Wrench
(1.5mm,2mm,2.5mm,3mm) Cutter Knife
Main Rotor Blades
Pitch Gauge Ball Link Sizing Tool Ball Link Plier
In order to operate this model, you need to purchase the following items not kit-included.
Swashplate tool
Guidelines for Safe R/C Helicopter Flight
Thread Lock
Battery
Gyro
Servos
Engine Starter Glow Igniter Starter Shaft Fuel Filter
Class 50 Engine Muffler for 50 Class
Glow Fuel for
Model Engines Fuel Pump
Length: 600~ 620mm

Step 1 Step 2 Step 3 Long items
Tail Set Step 4 Step 5 Rotor Head
Step 7 Step 9 Frame set Step 12
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.
Use AB Glue
A
B
Use Blue Threadlock
Use Grease
Mishandling due to failure to follow these instructions may result in damage, personal injury or danger.
Symbols & Assembling
* 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!
G
Use Bearing Retainer
When first opening your 3D Plus 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.
Pre-assembly Information

010 20 30 40
1Landing Gear
Tip:Do not over tighten
the four 3 x 5mm set
screws as it can damage
the landing struts.
Use AB Glue
A
B
M3 x10 Self Tapping
Bolt X 8
M3x5 Set Screw X 4
Radio Tray
Landing Gear Skid
Landing Gear Struts
M3X5 Set Screw
Frame Set Pre assembled-
A
B
Skid Cap
M3x5 Set Screw
M3x10 Self
Tapping Bolt
M3x10 Self
Tapping Bolt
010 20 30 40
2Engine & Pinion
Use Threadlock
M3X10 Cap Head Bolt
Engine Nut
Engine Mount
Crank Case Holder
Factory
Clutch
Assembled
Head Bolt
M3X12 Cap
Engine Thrust Washer
M3 Nylon Nut x2
M3x14 Cap Head Bolt x2
M3x8 Cap Head Bolt x2
M3x10 Cap Head Bolt x10
Lock the Piston in place with a
Crank Shaft Locking Tool in
order to tighten the Engine Nut.
See Page Team Tips!
Crank Case Dampner
Wrench
M3x12 Cap Head Bolt x2
M3x16 Cap Head Bolt x4

Leave a slight gap between the
clutch and clutch bell so that
the engine may run smoothly.
Clutch Bell
Clutch
0.2~0.5mm
gap here
010 20 30 40
3Boom & Tail Rotor
Crimping Belt damages the Tensile Cords
and will result in premature failure.
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.
Bearing Retainer
Use Threadlock
Insert the Tail Boom
fully into the Tail Case
before tightening the
2.5x6mm Bolts.
These bolts are used only
to compress the boom.
Please do not screw them
in completely.
M3 Nylon Nut
M3 Washer
M3 Nylon Nut
M3 Nylon Nut
M3 Washer
M3x14 Cap
Head Bolt
M2.5x6 Cap
Head Bolt
M3x26 Cap
Head Bolt
M3x32 Cap
Head Bolt
M3x38 Cap Head Bolt x4
M3 Washer x4
M3 Nylon Lock Nut x10
M2.5x6 Cap Head Bolt x2
M3x14 Cap Head Bolt x2
M3x26 Cap Head Bolt x2
M2.5 x8 Self Tapping
Bolt X 4
M3x32 Cap Head Bolt x2
M3x25 Cap Head Bolt x2
See Page Team Tips!
Bottom Board
M3 Nylon Nut
M3x14 Cap
Head Bolt
M3x16 Cap
Head Bolt
M3x8 Cap
Head Bolt

Slide the tail boom through the
tail boom block. Twist the tail belt
90° to the right before inserting it
into the boom block and through
the idler pulleys.
M2.5x8 Self Tapping Bolt
M3 Nylon Nut
010 20 30 40
Main Gear
4
M3x38 Cap
Head Bolt
M3x25 Cap
Head Bolt
There are 2 grooves on the boom. The
shorter groove is towards the tail while
the longer one is towards the frame.
Use Threadlock
Lift the Main Shaft Collar upwards and
secure to the Main Shaft by slightly
tightening the Lock Screw. It is
necessary to align the Lock Screw
through the hole in the side of the Main
Frame. While securing the Lock Screw,
make sure that you are pushing down
on the Main Shaft so that there will be
no up/down play in the Main Shaft once
the collar is secured.
M3 Nylon Lock Nut x1
M2.5x10 Cap Head Bolt x1
M3x27 Shanked Bolt x1 Mast Collar
M2.5x10 Cap
Head Bolt
Apply this Hole
See Page Team Tips!
Check the correct rotation of the
Tail Rotor Blades. The Blade on
the Top moves to the rear. If the
Tail Rotor rotates incorrectly,
simply pull out the main shaft and
twist the Belt in the other
direction.
Tail Blade
Turn Direction
M3 Nylon Nut
M3x27 Shanked Bolt

Thread
Flybar Thread
Thread
Paddle Insert
010 20 30 40
5Rotor,Washout & Swashplate
Be sure to note the correct
direction of the Flybar Paddles
as shown in the diagram. It is
very important to insure that the
Paddles are in parallel to each
other, as well as to the Flybar
Control Arm Assembly.
In this step, push the Flybar through
the Flybar Collar, Flybar Holder, and
Flybar Control Arm. Using set screws,
fix the Arms and Collars onto the
Flybar. Make sure that both sides of the
Flybar are of equal lengths.
M3x4
Set Screw
Adjust so that each side has exactly the same length
M4x4
Set Screw
M3x22 Shanked Bolt x1
M2.5 x8 Self Tapping
Bolt X 4
M4x4 Set Screw x2
Use Threadlock
M2.5 x8 Self Tapping
Bolt X 2
M3 Nylon Lock Nut x1
M3x4 Set Screw x6
Washout Set
Swashplate
M3X4 Set Screw
Paddle
Main Shaft
M3x22 Cap
Head Bolt
M3 Nylon
Nut
M2.5x8 Self
Tapping Bolt
M3X4 Set Screw
See Page Team Tips!

M2.5x16 Self Tapping
Bolt X 4
2.5mm Washer X 20
Servo Nut x 10
M2x6 Cap Head Bolt x8
M2.5x20 Cap Head Bolt x16
11mm
All control balls should be set
to 11mm from the center.
010 20 30 40
6Servo
Head Bolt Servo Spacer
Nylon Servo Nut
M2 5X20 Cap.
Servo
Link Ball Servo Horn
Tapping Bolt
2 5mm Washer.
M2 5X16 Self.
M2X6 Cap
Head Bolt
Servo Horn


8Equipment illustration
Main Grip Washout Arm
Phasing Control Ring
Boom
Parallel to
the Boom
To get the right phasing adjustment,
turn the Phasing Control Ring until
the Washout Arms and Main Grips
are parallel to the Tail Boom.
Battery
Aileron
Elevator
Throttle
Rudder
Pitch
Hitec/Futaba
JR
Ch1
Ch2
Ch3
Gyro Gain Ch5
Ch4
Ch6
Ch2
Ch3
Ch1
Aux2
Ch4
Aux1
Gyro
Please check first your radio manuals before connecting these electronic devices as shown below.
Receiver
7Phasing Control Ring Adjustment
Main Grips
Washout Arm
Boom
Phasing Block
010 20 30 40
010 20 30 40
Receiver
Pitch Servo
Rudder Servo
Throttle Servo
Aileron Servo
Elevator Servo
Gyro
Battery

00 10 20 30 40 00
9Linkage
The Linkage lengths indicated below are approximate. Be aware that these values may vary depending on
the servos and arms used in your setup.
Compass Model Ball Links are designed to
be tight; this allows you to adjust them to
your personal needs. We highly suggest the
use of a ball link sizing tool.
25mmx2
2mm
Please cut away 1.5mm
from each Ball Link.
41mmx2
60mmx2
107mmx2
40mmx3
75.5mmx1
144mmx4
Rudder Servo
300mmx1
Carbon Tube
Do not used pliers to resize Ball Links. Pliers can
cause inadvertent damage to the Ball Links that may
result in failure during use.

00 10 20 30 40
00
10 Setup
Pitch
General Flight
Throttle Pitch
5100% 13 deg
485%
370% 4~5 deg
235%
10% -5 deg
3D Style
Throttle Pitch
5100% 13 deg
475% 6.5 deg
350% 0 deg
275% -6.5 deg
1100% -13 deg
0%
20%
40%
60%
80%
100%
12345
0%
20%
40%
60%
80%
100%
12345
Throttle Curve
JR Futaba
Swash Type SWH
S3 120 SR3
Aile Elev Pitch
50% 50% 50%
Swash Type Setting
For any radio setup please refer to your radio
instructions first.
The data's shown above provide some general suggestions
for radio setting. This information varies according to types
of main blades, motor, pinion gear and engine. Adjustment
has to be made during the actual flight.
A
Parallel
Make sure that the Flybar Control Arms and Paddles are in line as shown in the diagram.
Turn on the Transmitter, set the Throttle Stick into center position for 0 ° Pitch. Use the Subtrim menu to
adjust the 3 Swash Servo Arms to reach the angle shown above.The 2 Push pull link rods are not
necessarily parallel but must be the same length
-
,.
B
9
0
°
9
0
°
T Arm
I Arm
Aileron Servo
Elevator Servo
Swashplate Swashplate

By adjusting the Links between Swashplate and Mixing Arms set the Mixing Arms to a 5° downward position.
Adjust the Links between the Mixing Arms and the Main Blade Holder to set the Main Blade Pitch to 0°.
D
Level the Swashplate by adjusting the links from the Servo Arms to the Swashplate. Use a Compass
Swashplate Tool as guide. Then set level the Washout Arms.
C
Horizontal
Horizontal
06 0501 Swashplate Tool-
Swashplate
Washout Arm
At the low throttle stick and throttle trim, the carburetor hole should be completely close. At full throttle stick,
carburetor hole should be completely open. Adjust the ATV in radio, or/and the control horn position on the
engine to achieve above requirement. Make sure the servo does not bind at any traveling point.
E
Full
open
Full
close
Full
Throttle
Lowest
Throttle
At Rudder middle stick set Rudder Servo 90 degree to the Carbon Tube Link, the Rudder Arm 90° to the
Carbon Tube Link And set Tail Blade to 7 pitch
,
.°.
7°
9
0
°
Rudder Servo
Carbon Tube
Rudder Arm
F
0 Pitch°
Mixing Arm
5°

Aileron Check
Mod 1 Mod 2
Elevator Check
Rudder Check
Pitch Check
Swashplate Reaction
00 10 20 30 40
00
11 Servo Direction Check
Turn the Transmitter on, your position has to be right behind the helicopters Tail. Make sure that the Swashplate
Mode is set to CCPM 120°. Move the Sticks according to the drawings and check the reaction of the Swashplate
and the Tail Pitch Plate. Check your Throttle setting as well and adjust your Transmitter settings accordingly.
Tilt Left Tilt Right
Tail Pitch Plate
Slide left Slide Right
Tilt Forward
Tilt Backward
Swash Plate
Ascent
Descent

M2.5x6 Self
Tapping Bolt
Canopy Insert
Use AB Glue
A
B
M2.5x6 Self Tapping
Bolt X 2
A
B
A
B
A
B
00 10 20 30 40 00
12 Canopy
00 10 20 30 40 00
13 Rotor Direction
5. Check that main blades, paddles and tail blades are installed in the right direction.
6. Check that there are no missing or damaged parts, never fly with any damaged parts.
7. Make sure all electronic devices are firmly fastened and connected.
8. Before starting the engine, make sure the Flight Mode or Idle switch is in Normal mode,
1. Ensure that receiver & transmitter battery are fully charged.
2 Check if all bolts and screws are fastened tightly and correctly..
3 Repeat step 11 to check all servo functions are correct..
4 Ensure tail and gyro direction are correctly set..
00 10 20 30 40 00
14 Pre Flight Check
Place the Canopy onto the Frames and mark
the right position of the Canopy Inserts. Apply
AB Glue to fix the Canopy Insert onto the
Canopy.
When the Rotor spins clockwise the Tail Blades should turn
clockwise as well watching the Tail Rotor from the Tail Fin side.
If not Belt is installed the wrong way and has to be corrected.
M3x15 Cap Head Bolt x2
and that the Throttle stick be in the lowest position.
Head Bolt
M3X12 Cap
Canopy
Dampener
Thumb Screw

Team Tips
General:
1.
2.
3.
The Ball Links on the 3D Plus need to be resized. These Ball Links will NOT break in over time.
they will stay tight and will cause unwanted interactions.
It is very important to make sure the clunk line does not get hung up inside to fuel tank. Remove the
fuel tank from the helicopter and rotate the tank. Be sure the clunk can get close to all corners of the
tank.
For tail servos like the 8900G, you have to file the mount a little bit wider to fit the servo.
Main Grip
Thrust Bearing Direction
Main grips are factory preassembled, in
case of reassembling, be sure to note
correct placement of large/small I.D.
washers during assembly.
Apply Grease Here
Larger ID
(IN)
Smaller ID
(OUT)
Some pilots may want to mount the gyro under the canopy
on the front electronics tray. To do so, mount the
electronics tray upside down, by doing so will allow the
gyro to be mounted perpendicular to the main shaft and
also allow more clearance for the receiver battery.
Step 3
Step 4
Step 5
:
:
:
Leave About 0.1mm space between the Flybar Collar and the Flybar Holder, this avoids the Flybar to snap
when flying.
It is very important to resize the Ball Links for smooth travel, especially on the tail; because issues like tail
wag, sluggish tail, or inconsistent Piro-rate will occur.
It is vital not to over tighten the Main Gear Bolt, or it can cause the Autorotation Gear to slightly warp. This
can cause a premature Belt failure, or reduce the lifetime of the Belt.

COMPASS MODEL (HK) LIMITED
www.compassmodel.com

Parts List
3D Plus
Version 1.0/2009
How to order your parts!
1.Check part number on the drawing
2.Use the part number to find the ORDER number on the list
3.Only use ORDER number for your parts order
Copyright @Compass Model 2009
As we continue to improve our products, this part list may not reflect all recent product amendments.
For more information, please refer to www.compassmodel.com

79 0308-
80 0206S-
02 1538-
80 0322S-
02 1103-
02 0110-
63 8165-
91 0003-
80 0428-
82 821003-
02 0701-
60 8165-
60 8165-
61 4083-
02 0118-
82 5131-
91 0004-
02 0113-
02 0109-
97 0920-
07 0106-
80 0310-
79 0510-
02 0507-
82 2562-
02 0511-
81 0304-
02 0543-
81 0304-
60 3083-
02 0553S-
02 0539-
02 0540-
02 0701-
02 0536G-
80 0206S-
80 0206S-
80 2514-
02 0531-
60 4083-
81 0404-
80 0208S-
60 4083-
Main Grip
Apply Grease Here
Larger ID
(IN)
Smaller ID
(OUT)
Thrust Bearing Direction
Main grips are factory preassembled, in
case of reassembling, be sure to note
correct placement of large/small I.D.
washers during assembly.