CYmodel YAK 3U CY8021 User manual

SAFETY PRECAUTIONS
This radiocontrol modelis nota toy!
lFirst-time buildersshould seekadvice frompeople havingbuilding
experience inorder toassemble themodel correctlyand toproduce
its performanceto fullextent. ,
lAssemble thiskit onlyin placesout ofchildrens reach!
lTakeenough safetyprecautions priorto operatingthis model.
,
You areresponsible forthis models assemblyand safeoperation!
lAlways keepthis instructionmanual readyat handfor quick
reference,even aftercompleting theassembly.
lCould causeserious injuryor evendeath
SPECIFICATION
YAK 3UYAK 3U
ALMOST - READY - TO - FLYALMOST - READY - TO - FLY
Before commencing assembly,please read these instructions thoroughly.
Thank you for choosing CYmodel
Global : www.cymodel.com
Australia : www.austars-model.com
Italia : www.biellaexpress.com
Instruction Manual
Item Nr: CY8021
Wing Span.......2440mm/96in
2
WingArea........83.4dm /1293sq.in
Total Length.....2220mm/87.4in
Engine:80-100cc gas engine
Radio:6 channels,8-9 servos

REQUIRED FOR OPERATION (Purchase separately)REQUIRED FOR OPERATION (Purchase separately)REQUIRED FOR OPERATION (Purchase separately)REQUIRED FOR OPERATION (Purchase separately)
TOOLS REQUIRED ( Purchase separately)TOOLS REQUIRED ( Purchase separately)TOOLS REQUIRED ( Purchase separately)TOOLS REQUIRED ( Purchase separately)
BEFOREYOUBEGINBEFOREYOUBEGINBEFOREYOUBEGINBEFOREYOUBEGIN
SharpHobby Knife Phillips Screw Driver Awl
NeedleNose Pliers Wire Cutters Scissors
Read through the manual before you begin ,so you will have an overall idea of what to do.
Check all parts .if you find any defective or missing parts .contact your local dealer.
Symbols used throughout this instruction manual,comprise.
111
222
333
.
.
Warning!
!
Do not overlook this symbol.
Aminimum 6channel radio for airplanes (with 9servos).
And dry batteries.
CAUTION: Only use a minimum 6channel radio for
airplanes! (No other radio may be used!)
!
12 AA-size Batteries
Aminimum 6 channel
transmitter for airplanes.
For handing the radio properly.refer to its instruction manual.
Engine and Muffler
Purchase a propeller that
will match your engine
Silicone Tube Fuel Filter
required for engine starting Glow engine fuel only.
WARNING: Normal gasoline cannot
be used with glow engines.
!
Fuel Pump Plug Wrench
Glue
Instant glue
Epoxy Glue
Other equipment for enhancing
airplane operation & perormance
12VBattery (for starter)
Engine Starter
BBBB
22
Cut off shaded portion.
Ensure smooth non-binding
movement while assembling.
Must be purchased
separately!
Pay close attention
here!
Drill holes with the specified
Diameter(here:2mm)
Assemble left and right
Sides the same way.
Apply instant glue
(CA glue,super glue).
Apply epoxy glue.
Cut off excess.
502
C.AC.A
LL
RR
AB2mm2mm
99
44
11
77
66
55
88
Model Airplaneengine:80-100ccgasengine
receiver
22
Battery (need 2)
33
Servo(need 9 servos )
remote control
Switch (need 2)
AA
Muffler
Muffler

!
3
2
1
5
4
33
Install the aileron and flap
Install the servo of aileron
Install the servo
Aileron
Flap
Hinge
Hinge
Install the aileron and flap
Bottom view
Install the servo of flap
Hinge
Hinge
Accessory list for this page.
LL
RR
LL
RR
Securely glue together. If comingoff duringflights,you'll
lose control ofyour airplane whichleads to accidents!
Warning!Warning!
LL
RR
FlapAileron
AB
AB
- - - - - - - - 6
- - - - - - - - 10
A B
A B
Make sure hingesare
mounted in thesame line
LL
RR
Flap Aileron
Tailing edge
Aileron
4mm
Servo line
LL
RR
Servo line
AB
AB
Rod adjuster
2.5X85mm rod
HORN
3X16 Screw
Rod adjuster
4
8
4
8
4
8
3mm Lock nut
Rod adjuster
2.5X85mm rod
HORN
3X16 Screw
Rod adjuster
2
4
2
4
2
4
3mm Lock nut
10
6
2.6X12mm Tp Screw
8
2.6X12mm Tp Screw
16
Rod adjuster
2.5X85mm rod
HORN
3X16 Screw
Rod adjuster
2
4
2
4
2
4
3mm Lock nut
2.6X12mm Tp Screw
8

!
8
7
6
10
9
44
Accessory list for this page.
Install the elevator
LL
RR
Securely glue together. If comingoff duringflights,you'll
lose control ofyour airplane whichleads to accidents!
Warning!Warning!
LL
RR
Bottom view
Install the elevator
make sure hingesare
mounted in thesame line
AB
Hinge
- - - - - - - - 8
Install the elevator servos
Install the elevator servos
LL
RR
LL
RR
LL
RR
LL
RR
Install the rudder
make sure hingesare
mounted in thesame line
Hinge
- - - - - - - 4
A B
A B
Rod adjuster
2.5X85mm rod
HORN
3X16 Screw
Rod adjuster
2
4
2
4
2
4
3mm Lock nut
Rod adjuster
2.5X85mm rod
HORN
3X16 Screw
Rod adjuster
2
4
2
4
2
4
3mm Lock nut
Hinge
12

!
13
12 15
1414
55
11
Accessory list for this page.
Install the rudder
Install the rudder
Install the tail wheel
Install the servos of rudder&tail wheel
Install the tail wheel
Securely glue together. If comingoff duringflights,you'll
lose control ofyour airplane whichleads to accidents!
Warning!Warning!
Tailing edge
Rudder
4mm
AB
AB
Aluminium tube
Rod
Steel wire
Rod adjuster
HORN
3X16 Screw
2
2
2
2
3mm Lock nut
2
2
2
Aluminium tube
Rod
Rod adjuster
3X16 Screw
2
2
2
3mm Lock nut
2
2
3.2mm Collar
3.2mm Nylon Collar
3X3mm Screw
6X9 screw
M3X20 Tp screw
3.2mm Rocker
6mm nut 1
1
3
1
3
1
2
Spring 2
3.2mm Collar
3.2mm Nylon Collar
3X3mm Screw
6X9 screw
M3X20 Tp screw
3.2mm Rocker
6mm nut 1
1
3
1
3
1
2
Aluminium tube
Rod
Steel wire
Rod adjuster
HORN
3X16 Screw
2
2
4
4
3mm Lock nut
2
4
4
Rod adjuster
2
Spring 2

!
18
17 20
19
16
66
Accessory list for this page.
Install the main landing gear
Install the main landing gear
LL
RR
LL
RR
502
C.A
C.A
Pleas notice the inner diameter for each
side of the pressure reduction inlet.
Please insure the sealing of the retract
system before flight .
Install the main landing gear
After glue the PVC cover,
cut off its excess part.
Install the main landing gear
Ply wood
- - - - - - - - - - - -2
Retainer
Rod adjuster
2X8mm screw
- - - - - 1
- - - - - 1
- - - - - 1
Rod (1.8X80mm)
- - - - - 1
900 Air line
- - - - - 2
3X20mm Tp screw
- - - - - 8
8mm nylon Nut
- - - - - 4
Retainer
Rod adjuster
2X8mm screw
- - - - - 1
- - - - - 1
- - - - - 1
Rod (1.8X80mm)
- - - - - 1
900 Air line
- - - - - 2
LL
RR
Fuselage installing
5X30mm screw
5mm Washer
- - - - - - - - 4
- - - - 4
Air tank
Switch
Air inlet
3-way
pressure inlet
3-way
pressure inlet
3-way
pressure inlet
Quick release connector
Quick release connector
Strut
Strut
5X30mm screw
5mm Washer
- - - - - - - - 4
- - - - 4
3X5mm screw
- - - - - - - - - - - -4
Ply wood
3X5mm screw
- - - - - 4
- - - - - 2
3X20mm Tp screw
- - - - - 8
4mm Lock nut
- - - - - 2
4mm Lock nut
- - - - - 2
3mm3mm

!
23
25
77
21 24
22
Accessory list for this page.
Horizontal
(Put the servo into the fuselage)
Main wing&Horizontal/Vertical tail
Securely glue together
,if coming off during flights.
You lose control of your airplane
which leads to accidents!
AA
B B
C C
4mm4mm
4X25mm screw
4mm Washer
- - - - - - - - 2
- - - - 2
Installing the engine mount
Main wing
(Put the servo line into the fuselage)
8mm nylon Nut
- - - - - 4
Installing the engine (80-100cc)
A
A
B
B
C
C
3X16mm screw
- - - - -12
3mm Lock nut
- - - - - 12
3mm Washer
- - - - - 24
Aluminium plank
- - - - - 2
3mm3mm
A B
275mm
Fuel tankFuel tank
ThrottleThrottle
4X25mm screw
4mm Washer
- - - - - - - - 2
- - - - 2
3X16mm screw
- - - - -12
3mm Lock nut
- - - - - 12
3mm Washer
- - - - - 24
Aluminium plank
- - - - - 2
8mm nylon Nut
- - - - - 4

!
28
27 30
29
88
26
Accessory list for this page.
Radio Equipment
Install the thr cowling
ReceiverReceiver
BatteryBattery
Battery/IgnitionBattery/Ignition
Install the canopy
SpinnerSpinner
PropellerPropeller
3mm Washer
- - - - - 2
3X30mm screw
- - - - - 2
3mm rubber band
- - - - 2
2.3X10mm Tp screw
- - - - -8
1.8X200mm Rod
- - - - - - 1
Linkage Stopper
2mm Nut
- - - - 1
- - - - 1
3X3mm Screw
- - - - - - 1
After confirmingthe
position(see frontof
fuel tank).
Insert and tighten
the screw.
Fuel supply line
Fuel pipe Air pressure line
Assembly of the full tank
Install the throttle servo
Cut awaythe surpluspats ofcanopy,
care fullyalong theshaded line.
3mm Washer
- - - - - 5
3X14mm screw
- - - - - 5
3mm rubber band
- - - - 5
1.8X200mm Rod
- - - - - - 1
Linkage Stopper
2mm Nut
- - - - 1
- - - - 1
3X3mm Screw
- - - - - - 1
3mm Washer
- - - - - 7
3X30mm screw
- - - - - 2
3mm rubber band
- - - - 7
2.3X10mm Tp screw
- - - - -8
3X14mm screw
- - - - - 5

33
32 34
Side view
ELEVATOR
Adjust the travel of each control surface to the
values in the diagrams.
These values fit general flight capabilities.
Readjust according to your needs and flight level.
Top view
31
AILERON
Adjustment.
Top view
Adjust the travel of each control surface to the
values in the diagrams.
These values fit general flight capabilities.
Readjust according to your needs and flight level.
99
Adjustment.
Never fly before checking the Cg s required position.
In order to obtain the CG specified ,reposition the
receiver and battery.
NEVER fly the model
without well balancing.
Warning!
!
CG
Side view
Rudder
Adjust the travel of each control surface to the
values in the diagrams.
These values fit general flight capabilities.
Readjust according to your needs and flight level.
Top view
205-215mm205-215mm
Adjustment
Side view
Adjustment.
45
45
45
45
45
Flap
45
45