The World Models Manufacturing Happy-Fly User manual

0.25 cubic inch displacement 2 stroke ( glow)

Radio required: 4 channels, 4 servos airplane radio

Wing SpanWing Span

Wing AreaWing Area

Flying WeightFlying Weight

Fuselage LengthFuselage Length

431 sq in / 27.8 sq dm431 sq in / 27.8 sq dm

3.5 lbs / 1500 g3.5 lbs / 1500 g

40.5 in / 1030 mm40.5 in / 1030 mm

* Specifications are subject to change without notice.** Specifications are subject to change without notice.*

Wa r ni n g ! T h i s m o d e l i s n o t a t o y.

It is designed for maximum performance. Please seek advice if one is not familiar with this kind

of engine powered precision model. Operating this model without prior preparation may cause

injuries. Remember, safety is the most important thing. Always keep this instruction manual

at hand for quick reference.

THE WORLD MODELS

MANUFACTURING CO., LTD.

FACTORY PRE-FABRICATED

ALMOST-READY-TO-FLY(ARF)SERIES

MADE IN CHINA

www.theworldmodels.com

45.5 in /1160mm45.5 in /1160mm

SpecificationsSpecifications

INSTRUCTION MANUALINSTRUCTION MANUAL

INDEXINDEX

BEFORE YOU BEGINBEFORE YOU BEGIN

PARTS LISTPARTS LIST

ASSEMBLYASSEMBLY

SAFETY PRECAUTIONSSAFETY PRECAUTIONS

P. 1P. 1

P. 2P. 2

P. 3 -9P. 3 -9

P.9P.9

BEFORE YOU BEGINBEFORE YOU BEGIN

Read through the manual before you begin, so you will have an overall idea of what to do.

P. 1

Symbols used throughout this instruction manual comprise of the following : -

Apply epoxy glue. Apply epoxy glue.

Assemble left and right

sides the same way.

Assemble left and right

sides the same way.

Peel off shaded portion

covering film.

Peel off shaded portion

covering film.

Drill holes with the specified

diameter (here: 3mm).

Drill holes with the specified

diameter (here: 3mm).

Pay close attention here!Pay close attention here!

Pierce the shaded portion

covering film.

Pierce the shaded portion

covering film.

Do not overlook this symbol!Do not overlook this symbol!

Must be purchased separately!Must be purchased separately!

Cut off shaded portion.Cut off shaded portion.

Ensure smooth non-binding

movement while assembling.

Ensure smooth non-binding

movement while assembling.

Apply instant glue

(C.A.glue, super glue.)

Apply instant glue

(C.A.glue, super glue.)

Check all parts. If you find any defective or missing parts contact your local dealer. Please DRY FIT

and check for defects for all parts that will require CA or Epoxy for final assembly. Any parts you

find to be defective after the gluing process may be difficult to remove for warranty replacement. The

manufacturer will replace any defective parts, but will be difficult to extend to the good parts that are

good before gluing to defective parts during assembly.

Parts List

1. FUSELAGE -- 1 pc.

2. MAIN WING -- 1 pair

3. STABILIZER & ELEVATOR -- 1 set

5. FUEL TANK 200cc -- 1 set

6. SPINNER 40mm --1 pc.

9. FRONT LANDING GEAR -- 1 pc.

8. WHEEL 50mm --3 pcs

4. VERTICAL FIN & RUDDER -- 1 set

10. MAIN LANDING GEAR -- 1 pair

12. PUSHROD:--

METAL ROD 1.6x310mm w/Plastic Tube

(For Front Landing Gear) -- 1 set

METAL ROD 1.8x120mm (For Elevator & Rudder ) -- 2 pcs

METAL ROD 1.8x85mm w/Threads (For Alieron) -- 2 pcs

METAL ROD 1.8x220mm w/Threads (For Elevator -- 1 pc.

METAL ROD 1.8x240mm w/Threads (For Rudder) -- 1 pc.

13. THROTTLE PUSHWIRE 1.2 x 340mm

w/Plastic tube d2xD3x160mm -- 1 set

P. 2

18. DECALS: ST 200 017 --1 set

17. FUEL TUBE 6 x 5mm -- 6 pcs

HEAT-SHRINK TUBE 8x40mm -- 4 pcs

14. WOODEN PARTS :--

BALSA WOOD 10x 10 x 66mm (For Fixing Fuel Tank ) --1 pc.

PLYWOOD 6 x 16 x100mm (Wing Joiner) --1 pc.

PLYWOOD 3 x 12 x 30mm ( For Aileron Servo) --2 pcs.

15 PLASTIC PARTS :--

CLEVIS -- 4 pcs

STRAPER -- 2 pcs

RUBBER BAND 60 x 4mm -- 4 pcs

STEERING ARM --1 pc.

16. METAL PARTS :--

LINKAGE CONNECTOR -- 4 sets

COLLAR 3.6mm w/set screw -- 7 sets

NUT 3mm -- 8 pcs

SCREW PA3 x 10mm -- 4 pcs

SCREW PM2 x 12mm -- 4 pcs

WASHER d3xD7mm -- 8 pcs

SCREW PM3 x 25mm -- 4 pcs

11. FIN TIP 3x19x70mm -- 1 pc.

7. SPONGE 10x80x200mm (For Radio equipment) -- 2 pcs

PLYWOOD 3 x 66 x106mm (Servos Stand) --1 pc.

WOODEN 6 x 102 (For Fixing Wing) --2 pcs.

WOODEN 8 x 300 (For Elevator & Rudder Servos) --2 pcs.

HORN -- 2 sets

RING 2.3mm -- 2 pcs

STEERING ARM STAND --1 pc.

PLATE (For Main Landing Gear) -- 2 pcs

SCREW PA2.6 x 12mm -- 4 pcs

Main WingMain Wing

Aileron ServoAileron Servo

P. 3

Aileron ServoAileron Servo

Securely glue together. If coming

off during flights, you lose control

of your airplane which leads to

accidets!

Plywood

3 x 12 x 30mm

Plywood

3 x 12 x 30mm

Cut out the covering film

1mm

Straper

Fuel Tube

6 x 5mm -- 4 pcs

Clevis

Ring

P. 4

Landing GearLanding Gear

Front WheelFront Wheel

3mm Set Screw 4

3.6mm Collar

3mm Set Screw

Front Wheel

PushWire

Steering Arm

Front View

3mm Set Screw

Completed

Way A:Way A:

Way B:Way B:

For Way B

3.6mm Collar

44 Landing Gear Landing Gear

P. 5

77Fuel TankFuel Tank

Fuel Tank 200cc

Fuel Tank

Install Balsa 10 x 10 x 66mm

(For fixing fuel tank)

Top View

EngineEngine

PM3 x 25mm Screw

3mm Washer

3mm Nut

3mm

Throttle Pushwire

w/plastic tube

3mm

PM3 x 25mm

Install Engine position

95mm

3.74 in

Spinner

40mm

3mm

StabilizerStabilizer

Peel off shaded portion

covering film

A'A =

Tempo rar y ins ta ll t he m a in wi ng , a dj us t

leveling of t he s ta bi lizer t o m ake i t a s

pa rallel t o t he m ain wi ng a s po ssibl e.

(Stabilizer)

(Main Wing)

BB'

Vertical FinVertical Fin

1010

P. 6

A A'

A = A'

Servo SetServo Set

1111

LINKAGE CONNECTOR

3 x 3mm Set Screw

2mm Nut

2mm Washer

2mm

3mm

Throttle Pushwire,

Rudder Pushrod,

Elevator Pushrod.

2mm

Included with the Radio Set.

Throttle Servo.Rudder Servo.

Elevator Servo.

Please refer to attached sheet for linkage stopper installation.

Radio EquipmentRadio Equipment

1212

ron

Throttle Pushwire

Front Wheel

Pushwire

Elevator Pushrod

Rudder Pushrod

Top View

Linkage Connector

Wooden Rod

Ø8x300mm

Metal Rod

Ø1.8x120mm

Plywood 3x66x106mm

P. 7

Radio EquipmentRadio Equipment

1313 Install and arrange the servo as shown in the diagram.

Throttle

Servo

Elevator

Servo

Rudder

Top View

Recevier

Battery

Fuel Tank

1414 Rudder PushrodRudder Pushrod

PM 2 x 12mm Scre w

Rudder Pushrod

PM2 x12mm

Line up the holes

of the horn to the

edge of the rudder.

See diagram.

Rudder

Clevis

horn

Fuel Tube

6 x 5mm

Horn

1515

Elevator PushrodElevator Pushrod

PM 2 x 12mm Scre w

Servo

To Elevator 6 x 5 m m

F u e l T u b e

Cl e v i s

PM 2 x 12mm

Horn

L in e u p t h e h ol e s

o f t he h o r n t o t h e

e dg e o f t h e e l e va to r.

S ee d i a gr a m .

Bo t t o m Vi e w

Elevator horn

P. 8

1717 Wing SettingWing Setting

1818 Control ThrowsControl Throws

1616 Main WingMain Wing

60 x 4mm Rubber Band

Rubber Band

St 1

Sep2

3Step

Step

Mount the rubber bands following step

one to step four and repeat once. In t

otal, eight rubber bands are used for

mounting.

Adjust the wing and fuselage configuration

shown as in the diagrams.

A = A'

B = B'

C = C'

A A'

B B'

C C'

Elevator

Rudder

Aileron

10mm

20mm

5mm

Adjust the control throws as shown in

the diagram. These throws are good for

general flying. You can adjust according

to your personal preference.

Wooden Ø6x102mm

C. G.C. G.

1919

85mm85mm

3.35 in3.35 in

The ideal C.G. position is 85mm(3.35 in.) behind

the leading edge measured at where the wing meets

the fuselage. In order to obtain the C.G. specified,

add weight to the fuselage or move the battery

position. Check the C.G. before flying.

Important Safety PrecautionsImportant Safety Precautions

# First time flyer should never fly by himself / herself. Assistance from experienced flyer is# First time flyer should never fly by himself / herself. Assistance from experienced flyer is

absolutely necessary. absolutely necessary.

#Pre-flight adjustment must be done before flying, it is very dangerous to fly a badly#Pre-flight adjustment must be done before flying, it is very dangerous to fly a badly

pre-adjusted aircraft. pre-adjusted aircraft.

#Make sure the air field is spacious, never fly the plane too close to people and never get#Make sure the air field is spacious, never fly the plane too close to people and never get

too close to a running propeller. too close to a running propeller.

#If you find wrinkles on the covering as a result of weather changes, you can use hot iron#If you find wrinkles on the covering as a result of weather changes, you can use hot iron

to remove the wrinkles. Please begin with lower temperature setting and gradually raise to remove the wrinkles. Please begin with lower temperature setting and gradually raise

the temperature until the wrinkles are gone. Too hot an iron may damage the covering. the temperature until the wrinkles are gone. Too hot an iron may damage the covering.

#Check and re-tighten up all factory assembled screws, use thread locker if applicable. #Check and re-tighten up all factory assembled screws, use thread locker if applicable.

# HAPPY FLY 20 is specially designed to be powered by 0.25 2 stroke glow# HAPPY FLY 20 is specially designed to be powered by 0.25 2 stroke glow

engine, using a more engine, using a more

powerful engine does not mean better performance. In fact, over powerful engine does not mean better performance. In fact, over

powered engine may powered engine may cause severe damge and injuries.cause severe damge and injuries.

A022S0606

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