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GP/EP SIZE .61-.91 or 15-20CC SCALE 1:6 ¼   ARF

Instruction Manual

SPECIFICATION 
- Wingspan: 1450mm (57 in) 
- Length: 1533mm (60.3 in)
- Flying weight: 4600-5000 g
- Wing area: 38.5 dm2
- Wing loading: 128g/dm2
- Wing type: Naca airfoils
- Covering type: Genuine ORACOVER®
- Gear type: Retract gear With CNC Suspension 
  Metal Struts (included)
- Spinner size: scale type 70mm  (included)
- Radio: 6 channel minimum (not included) 
- Servo: 8 standard servo: 2 aileron; 2 flap; 1 elevator; 
  1 rudder; 1steering nose; 1 throttle; and 3 retract 
  gear (Futaba S3170G) (not included) 
- Recommended receiver battery: 
  4.8-6V / 2000 mAh NiMH (not included) 
- Servo mount: 21mm x 42 mm
- Propeller: suit with your engine 

- Engine: .61-.91 / 2-stroke glow engine  or 
  15-20cc gas engine (not included)
- Motor: brushless outrunner 2200 W, 
  500 KV (not included)
- Gravity CG: 138 mm (5,4 in) Back from  the 
  leading edge of the wing, at the fuselage
- Control throw Ailerons: Low: 8mm up/down, 
  10% expo; High: 10mm up/down, 10% expo
- Control throw Elevators: Low: 9mm up/down, 
  12% expo; High: 11mm up/down, 12% expo
- Control throw Rudder: Low: 20mm right/left, 
  15% expo; High: 30mm right/left, 15% expo
- Control throw Flap: 15-20 mm down
- Experience level: Intermediate
- Plane type: Scale Military
RECOMMENDED MOTOR AND BATTERY SET UP
- Motor: RIMFIRE .80 (not included)
- Lipo cell: 6 cells / 4000 – 5500mAh (not included)
- Esc: 60-100A (not included)

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3.    Place  the  servo  into  the  servo  tray.  Center  the 

servo within the tray and drill 1,6mm pilot holes 
through  the  block  of  wood  for  each  of  the  four 
mounting screws provided with the servo.

Remove the covering

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INSTALLING THE AILERON SERVOS

1.   Install  the  rubber  grommets  and  brass  eyelets 

onto the aileron servo.

2.  Using  a  modeling  knife,  remove  the  covering 

from over the pre-cut servo arm exit hole on the 
aileron  servo  tray  /  hatch.  This  hole  will  allow 
the  servo  arm  to  pass  through  when  installing 
the  aileron pushrods.

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5.  Place  the  aileron  servo  tray  /  hatch  into  the 

servo  box  on  the  bottom  of  the  wing  and  drill 
1,6mm  pilot  holes  through  the  tray  and  the 
servo box for each of the four mounting screws. 
Secure  the  servo  tray  in  place  using  the 
mounting screws provided ( 2mm x 12mm ).

6.  Repeat  step  #  2  -  #  5  to  install  the  second 

aileron servo in the opposite wing half.

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4.  Using the thread as a guide and using masking 

tape,  tape  the  servo  lead  to  the  end  of  the 
thread: carefully pull the thread out. When you 
have  pulled  the  servo  lead  out,  remove  the 
masking  tape  and  the  servo  lead  from  the 
thread.

Servo lead

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INSTALLING THE CONTROL HORNS FOR
AILERON

1.  One aileron  control horn in positioned  on each 

aileron.  Using  a  ruler  and  a  pen,  locate  and 
mark  the  location  of  the  control  horn.  It  should     
be mounted on the bottom side of the aileron at 
the  leading  edge,  in  line  with  the  aileron 
pushrod.

2.    Drill  two  holes  through  the  aileron  using  the 

control  horn  as  a  guide  and  screw  the  control 
horn in place. 

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INSTALLING THE AILERON LINKAGES

1. Working with the aileron linkage for now, thread 

one  nylon  clevis  at  least  14  turns  onto  one  of 
the 2mm x 180mm threaded wires.

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8.  Insert  the  90  degree  bend  down  through  the 

hole  in  the  servo  arm.  Install  one  nylon  snap 
keeper  over  the  wire  to  secure  it  to  the  arm. 
Install  the  servo  arm  retaining  screw  and 
remove the masking tape from the aileron.

9.  Repeat  step  #  4  -  #  8  to  install  the  second 

aileron  linkage.  After  both  linkages  are 
completed,  connect  both  of  the  aileron  servo 
leads  using  a  Y-harness  you  have  purchased 
separately.

Silicone Tube

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3. Repeat step # 1 - # 2 to install the control horn 

on the opposite aileron.

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2.  Attach the clevis to the outer hole in the control 

horn. Install a silicone tube on the clevis.

3.    Locate  one  nylon  servo  arm,  and  using  wire 

cutters, remove all but one of the arms. Using a 
2mm drill bit, enlarge the third hole out from the 
center  of  the  arm  to  accommodate  the  aileron 
pushrod wire.

4.  Plug  the  aileron  servo  into  the  receiver  and 

center the servo. Install the servo arm onto the 
servo. The  servo  arm  should  be  perpendicular 
to the servo and point toward the middle of the 
wing.

5.    Center  the  aileron  and  hold  it  in  place  using  a 

couple of pieces of masking tape.

6.  With  the  aileron  and  aileron  servo  centered, 

carefully  place  a  mark  on  the  aileron  pushrod 
wire where it crosses the hole in the servo arm.

7.    Using  pliers,  carefully  make  a  90  degree  bend 

down  at  the  mark  made.  Cut  off  the  excess 
wire, leaving about 4mm beyond the bend.

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RIGHT

WRONG

INSTALLING THE CONTROL HORNS for flap

        Repeat  step  #1  -  #3  from  installing  the  control 

horn  for  aileron  to  install  the  control  horn  for 
flap. 

INSTALLING THE flap LINKAGES

      Repeat step #1 - #9 from installing the aileron 

linkage to install the flap linkage.

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TOOLS AND SUPPLIES NEEDED

•  Medium C/A glue
•  30 minute epoxy
•  6 minute epoxy
•  Hand or electric drill
•  Assorted drill bits
•  Modeling knife
•  Straight edge ruler
•  2 bender plier
•  Wire cutters
•  Masking tape
•  Thread lock
•  Paper towels
•  Rubbing alcohol

SUGGESTION 

To avoid scratching your new airplane, do not unwrap 
the pieces until they are needed for assembly. Cover 
your  workbench  with  an  old  towel  or  brown  paper, 
both  to  protect  the  aircraft  and  to  protect  the  table. 
Keep  a  couple  of  jars  or  bowls  handy  to  hold  the 
small parts after you open the bag.

NOTE:

Please trial fit all the parts. Make sure you have the 
correct parts and that they fit and are aligned properly 
before gluing! This will assure proper assembly. The 
PC21  PILATUS  GP/EP  SIZE  .61-.91  or  15-20CC 
SCALE  1:6  ¼  ARF  is  hand  made  from  natural 
materials,  every  plane  is  unique  and  minor 
adjustments  may  have  to  be  made.  However,  you 
should find the fit superior and assembly simple.

The painted and plastic parts used in this kit are fuel 
proof. However, they are not tolerant of many harsh 
chemicals  including  the  following:  paint  thinner,  C/A 
glue accelerator, C/A glue debonder and acetone. Do 
not  let  these  chemicals  come  in  contact  with  the 
colors on the covering and the plastic parts.

SAFETY PRECAUTION:

•  This is not a toy
•  Be sure that no other flyers are using your radio 

frequency.

•  Do not smoke near fuel
•  Store  fuel  in  a  cool,  dry  place,  away  from 

children and pets.

•  Wear safety glasses.
•  The glow plug clip must be securely attached to 

the glow plug.

•  Do not flip the propeller with your fingers.
•  Keep loose clothing and wires away from the propeller.
•  Do not start the engine if people are near. Do not 

stand in line with the side of the propeller.

•  Make engine adjustments from behind the propeller 

only. Do not reach around the spinning propeller.

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PREPARATIONS

Use  a  covering  iron  with  a  covering  sock  on 
high  heat  to  tighten  the  covering  if  necessary. 
Apply  pressure  over  sheeted  areas  to 
thoroughly bond the covering to the wood.

INSTALLING THE AILERONS - Flaps

1.  Test fit the ailerons to the wing with the hinges. 

If  the  hinges  don’t  remain  centered,  stick  a  pin 
through  the  middle  of  the  hinge  to  hold  it  in 
position.

TEMPORARY PIN

TO KEEP HINGE

CENTERED

2.  Apply six drops of thin CA to the top and bottom 

of each hinge. Do not use CA accelerator. After 
the  CA  has  fully  hardened,  test  the  hinges  by 
pulling on the aileron.

C.A glue

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Screw 

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Screw 

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Connector

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Screw 

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Screw

Screw

7.  Install and secure the retract gear into the wing.

6.  Attach the metal rod to the control horn.

11.  Install  the  adjustable  servo  connector  to  the 

servo arm of the servo retract gear.

9.  Secure the axle.

8.  Secure the wheel.

8.  Secure the wheel.

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INSTALLING THE HORIZONTAL STABILIZER

1.  Using a modeling knife, cut away the covering from 

the fuselage for the stabilizer and remove it.

4.    Remove  the  stabilizer.  Using  the  lines  you  just 

drew as a guide, carefully remove the covering 
from between them using a modeling knife.

     When cutting through the covering to remove it, 

cut  with  only  enough  pressure  to  only  cut 
through  the  covering  it's  self.  Cutting  into  the 
balsa structure may weaken it. This could lead 
to possible failure during flight.

2.    Check  the  fit  of  the  horizontal  stabilizer  in  its 

slot.  Make  sure  the  horizontal  stabilizer  is 
square  and  centered  to  the  fuselage  by  taking 
measurements, but don't glue anything yet.

Remover the covering

Remover the covering

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2.  Plug the throttle servo into the receiver and turn 

on  the  radio  system.  Check  to  ensure  that  the 
throttle  servo  output  shaft  is  moving  in  the 
correct  direction.  When  the  throttle  stick  is 
moved  forward  from  idle  to  full  throttle,  the 
throttle barrel should also open and close using 
this  motion.  If  not,  reverse  the  direction  of  the 
servo, using the transmitter.

3.  Slide the adjustable metal connector / servo arm 

assembly  over  the  plain  end  of  the  pushrod 
wire.  Position  the  throttle  stick  and  the  throttle 
trim at their lowest positions. 

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INSTALLING THE THROTTLE

1.    Install  one  adjustable  metal  connector  through 

the  third  hole  out  from  the  center  of  one  servo 
arm,  enlarge  the  hole  in  the  servo  arm  using  a 
2mm  drill  bit  to  accommodate  the  servo 
connector.  Remove  the  excess  material  from 
the arm.

        After  installing  the  adjustable  metal  connector 

apply a small drop of thin C/A to the bottom nut. 
This  will  prevent  the  connector  from  loosening 
during flight.

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12.  With  the  elevator  halves  and  elevator  servo 

centered,  carefully  place  a  mark  on  the 
elevator  pushrod  wire  where  it  crosses  the 
hole in the servo arm. 

13. Using pliers, carefully make a 90 degree bend 

up at the mark made. Cut off the excess wire, 
leaving about 8mm beyond the bend.

14. Insert the 90 degree bend up through the hole 

in the servo arm, install one nylon snap keeper 
over the wire to secure it to the arm. Install the 
servo  arm  retaining  screw  and  remove  the 
masking tape the elevator halves.

10.  Plug  the  elevator  servo  into  the  receiver  and 

center the servo. Install the servo arm onto the 
servo. The servo arm should be perpendicular 
to the servo and point toward the middle of the 
fuselage.

11.  Be  sure  both  elevator  halves  are  flat.  Center 

both  elevator  halves  and  hold  them  in  place 
using a couple of pieces of masking tape.

INSTALLING THE RUDDER PUSHROD

1.  Locate the pushrod exit slot on the right side of 

the fuselage.

2.  Carefully  cut  away  the  covering  material  from 

the slot.

3.  Working  from  inside  the  fuselage,  slide  the 

threaded  end  of  the  remaining  pushrod  down 
the  inside  of  the  fuselage  until  the    pushrod  
reaches  the  exit  slot.  Carefully  reach  in  with  a 
small screw driver and guide the pushrod out of 
the exit slot.

4.    Install  the  clevis  on  the  rudder  pushrod.  Make 

sure 6mm of thread  shows inside the clevis.

6.    Drill  two  holes  through  the  rudder  using  the 

control  horn  as  a  guide  and  screw  the  control 
horn in place. 

7.  Attach clevis to the third hole in the control horn. 

Install a silicone tube on the clevis.

5.  The control horn should be mounted on the left  

side  of  the  rudder  at  the  leading  edge,  in  line 
with the rudder pushrod.

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8.  Locate  one  nylon  servo  arm,  and  using  wire 

cutters, remove all but one of the arms using a 
2mm drill bit, enlarge the third hole out from the 
center  to  accommodate  the  rudder  pushrod 
wire.

9.  Plug  the  rudder  servo  into  the  receiver  and 

center the servo. Install the servo arm onto the 
servo.

10.  Center  the  rudder  and  hold  it  in  place  using  a 

piece of masking tape.

11.  With  the  rudder  and  rudder  servo  centered, 

carefully  place  a  mark  on  the  rudder  pushrod 
wire where it crosses the hole in the servo arm.

12.  Using  a  pliers,  carefully  make  a  90  degree 

bend up at the mark made. Cut off excess wire, 
leaving about 8mm beyond the bend.

13. Insert the 90 degree bend up through the hole 

in the servo arm. Install one nylon snap keeper 
over the wire to secure it to the arm. Install the 
servo  arm  retaining  screw  and  remove  the 
masking tape from the rudder.

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Metal domino

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Remover the 
covering

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Screw

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Receiver

Switch

Screw

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Open and close 

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C.A glue

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C.A glue

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BALANCING

1.  It  is  critical  that  your  airplane  be  balanced 

correctly.  Improper  balance  will  cause  your 
plane to lose control and crash.

THE  CENTER  OF  GRAVITY  IS  LOCATED 
138mm  (5.4  in)  BACK  FROM  THE  LEADING 
EDGE  OF  THE  WING,  AT  THE  FUSELAGE. 
BALANCE  A  PLANE  UPSIDE  DOWN  WITH 
THE FUEL TANK EMPTY.

2.  Mount the wing to the fuselage. Using a couple 

of  pieces  of  masking  tape,  place  them  on  the 
top  side  of  the  wing  138mm  (5.4  in)  back  from 
the leading edge, at the fuselage sides.

3.  Turn  the  airplane  upside  down.  Place  your 

fingers  on  the  masking  tape  and  carefully  lift 
the plane.

4.  If  the nose of the plane falls, the plane is nose 

heavy.  To  correct  this  first  move  the  battery 
pack  further  back  in  the  fuselage.  If  this  is  not 
possible  or  does  not  correct  it,  stick  small 
amounts  of  lead  weight  on  the  fuselage  under     
the  horizontal  stabilizer.  If  the  tail  of  the  plane 
falls,  the  plane  is  tail  heavy.  To  correct  this, 
move the battery and receiver forward or if this 
is  not  possible,  stick  weight  into  the  firewall. 
When  balanced  correctly,  the  airplane  should 
sit level or slightly nose down when you lift it up 
with your fingers. 

open and close the canopy

GLUeing the expand part of horizontal 
and vertical stabilizer

 

ENGINE INSTALLATION

 INSTALLING THE THROTTLE PUSHROD HOUSING

1. Install the engine mount.

2.  Place  the  engine  into  the  engine  mount  and 

align  it  properly  with  the  front  of  the  cowling. 
The distance from the firewall to the front of the 
engine thrust washer should 120mm.

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8.  Connect  the  two  elevator  pushrod  using  the 

metal domino.

9.    Locate  one  nylon  servo  arm,  and  using  wire 

cutters, remove all but one of the arms. Using 
a 2mm drill bit, enlarge the third hole out from 
the  center  to  accommodate  the  elevator 
pushrod wire.

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Remover the 
covering

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2. Mount the servos to the tray using the mounting 

screws provided with your radio system.

SERVO INSTALLATION
INSTALLING THE FUSELAGE SERVOS

1.    Install  the  rubber  grommets  and  brass  collets 

into  the  elevator,  rudder  and  throttle  servos. 
Test  fit  the  servos  into  the  servo  tray. Trim  the 
tray if necessary to fit your servos.

3.    Working  from  inside  the  fuselage,  slide  the 

threaded end of the pushrod until it reaches the 
exit  slot.  Carefully  reach  in  with  a  small  screw 
driver and guide the pushrod out of the exit slot.

4.  Install  the clevis  into the two elevator  pushrod. 

Make sure 6mm of thread shows inside the clevis.

5.    The  control  horn  should  be  mounted  on  the 

bottom, left side and right side of the elevator at 
the  leading  edge,  in  line  with  the  elevator 
pushrod.

6.    Drill  two  holes  through  the  elevator  using  the 

control  horn  as  a  guide  and  screw  the  control 
horn in place.

7.    Attach  clevis  to  the  third  hole  in  the  control 

horn. Install a silicone tube on the clevis.

 INSTALLING THE ELEVATOR PUSHROD

1.    Locate  the  pushrod  exit  slot  on  the  right  side 

and  left  side  of  the  fuselage.  It  is  located 
slightly  ahead  and  below  the  horizontal 
stabilizer.

2.    Carefully  cut  away  the  covering  material  from 

the slot.

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3.  Slide  the  pushrod  housing  through  the  hole  in 

the  firewall,  through  the  hole  in  the  forward 
bulkhead, and into the servo compartment.

4.  Apply  a  couple  of  drops  of  thin  C/A  to  the 

pushrod housing where it exits the firewall and 
where it passes through the forward bulkhead. 
This will secure the housing in place.

5.  Using  a  modeling  knife,  cut  off  the  nylon 

pushrod housing in front of the servo tray.

     

If your engine is equipped with a remote needle 

valve, we suggest installing it into the engine at 
this time.

!

INSTALLING THE ENGINE

   Locate the long piece of wire used for the throttle 

pushrod.  One  end  of  the  wire  has  been 
pre-bend  in  to  a  "Z"  bend  at  the  factory.  This 
"Z"  bend  should  be  inserted  into  the  throttle 
arm  of  the  engine  when  the  engine  is  fitted 
onto  the  engine  mount.  Fit  the  engine  to  the 
engine mount using the screws provided.

50

INSTALLING THE MOTOR AND BATTERY

This model can fly with electric, here is our 

recommended for set up the system.

- Motor brushless: Rimfire .80

- Lipo cells: 6 cells / 4000 - 5500 mAh. 

  (not included)

- ESC: 60A - 100A.

Installing the electric motor

53

55

56

ESC

54

Screw

52

16mm

50mm

- OS .61-.91 two stroke

- OS 15cc GT

70mm

58

Zip tie

59

3.    With  the  horizontal  stabilizer  correctly  aligned, 

mark the shape of the fuselage onto the bottom 
and into the top of the horizontal stabilizer using 
a water soluble/ non-permanent felt-tip pen.

5.    When  you  are  sure  that  everything  is  aligned 

correctly,  mix  up  a  generous  amount  of  30 
minute epoxy. Apply a thin layer to the  bottom 
of  the  stabilizer  mounting  area  and  to  the 
stabilizer  mounting  platform  sides  in  the 
fuselage.  Insert  the  stabilizer  in  place  and 
re-align. 

Double 

check 

all 

of 

your 

measurements one more time before the epoxy 
cures.  Remove  any  excess  epoxy  using  a 
paper  towel  and  rubbing  alcohol  and  hold  the 
stabilizer in place with T-pins or masking tape. 

C.A glue

49

C.A glue

       

Do  not  secure  the  tank  into  place  permanently 

until  after  balancing  the  airplane.  You  may 
need  to  remove  the  tank  to  mount  the  battery 
in the fuel tank compartment.

9. Secure the fuel tank. 

!

8.  Feed  three  lines  through  the  fuel  tank 

compartment  and  through  the  pre-drilled  hole 
in the firewall. Pull the lines out from behind the 
engine,  while  guiding  the  fuel  tank  into  place. 
Push  the  fuel  tank  as  far  forward  as  possible, 
the front of the tank should just about touch the 
back of the firewall.

     Blow through one of the lines to ensure the fuel 

lines  have  not  become  kinked  inside  the  fuel 
tank  compartment.  Air  should  flow  through 
easily.

5.  Test  fit  the  stopper  assembly  into  the  tank.  It 

may  be  necessary  to  remove  some  of  the 
flashing  around  the  tank  opening  using  a 
modeling  knife.  If  flashing  is  present,  make 
sure none of it falls into the tank.

6. When satisfied with the alignment of the stopper 

assembly  tighten  the  3mm  x  20mm  machine 
screw  until  the  rubber  stopper  expands  and 
seals the tank opening. Do not over tighten the 
assembly as this could cause the tank to split. 

7.  Using a modeling knife, cut 3 lengths of fuel line 

150mm  long.  Connect  2  lines  to  the  2  vent 
tubes  and  1  line  to  the  fuel  pickup  tube  in  the 
stopper.

!

2. Using a modeling knife, cut one length of silicon 

fuel  line  (the  length  of  silicon  fuel  line  is 
calculated  by  how  the  weighted  clunk  should 
rest about 5mm away from the rear of the tank 
and  move  freely  inside  the  tank).  Connect  one 
end  of  the  line  to  the  weighted  clunk  and  the 
other  end  to  the  nylon  pick  up  tube  in  the 
stopper.

3. Carefully bend the second nylon tube up at a 45 

degree  angle  (using  a  cigarette  lighter).  This 
tube will be the vent tube to the muffler.

4. Carefully bend the third nylon tube down at a 45 

degree  angle  (using  a  cigarette  lighter).  This  
tube will be vent tube to the fueling valve.

       

When  the  stopper  assembly  is  installed  in  the 

tank,  the  top  of  the  vent  tube  should  rest  just 
below the top surface of the tank. It should not 
touch the top of the tank.

INSTALLING THE STOPPER ASSEMBLY

1.  The  stopper  has  been  pre-assembled  at  the 

factory.

57

Lipo-Battery

42

Elevator servo

To carburator

To vent tube

To muffler

MOUNTING THE COWL

1. Remove the muffler and needle valve assembly 

from the engine. Slide the fiberglass cowl over 
the engine.

2.    Measure  and  mark  the  locations  to  be  cut  out 

for  engine  head  clearance,  needle  valve, 
muffler,.  Remove  the  cowl  and  make  these 
cutouts  using  a  rotary  tool  with  a  cutting  disc 
and a rotary sanding drum attachment.

3.  Slide the cowl back into place. Align the front of 

the cowl with the crankshaft of the engine. The 
front  of  the  cowl  should  be  positioned  so  the 
crankshaft  is  in  the  middle  of  the  precut 
opening.  Hold  the  cowl  firmly  in  place  using 
several pieces of masking tape.

6.  Slide the cowl back over the engine and secure 

it  in  place  using  four  3mm  x  12mm  wood 
screws.

7. Install the muffler. Connect the fuel and pressure 

lines  to  the  carburator,  muffler  and  fuel  filler 
valve. Tighten the screws completely.

4.    While  holding  the  cowl  firmly  in  position,  drill 

four  1,6mm  pilot  holes  through  both  the  cowl 
and the side edges of the firewall.

5.  Using a 3mm drill bit, enlarge the four holes in 

the cowling

    

Enlarging the holes through the cowl will prevent 

the fiberglass from splitting when the mounting 
screws are installed.

!

4. Manually push the carburator barrel fully closed. 

Angle  the  arm  back  about  45  degree  from 
center and attach the servo arm onto the servo. 
With the carburator barrel fully closed, tighte the 
set screw in the adjustable metal connector.

5.    Remove  the  excess  throttle  pushrod  wire  using 

wire  cutters  and  install  the  servo  arm  retaining 
screw.

72

Throttle servo

Rudder rod

71

Open and close

Rudder servo

Control horn elevator

Elevator rod

Control horn rudder

Rudder rod

Control horn elevator

4

14

Instruction Manual

PC21 PILATUS

18

16

17

C.A glue

3.  Glue the wheel well by C.A glue.

4.  Install the servo retract gear.

10.  Secure the wooden wheel cover.

6

27

28

Screw

Joiner

2.  Remove the covering from the bottom of the
     wing.

19

15

Instruction Manual

PC21 PILATUS

5

Instruction Manual

PC21 PILATUS

Atter confirming the direction (see 
front view of fuel tank). Insert and 
tighten the screw.

5mm

Remove the covering

M3 clevis

M2 clevis

Crimp

Spring

Servo retract

6.  Attach the metal rod to the nose retract.

13.  Connect two spring to the nose gear arm.

12.  Secure the strut suspension to the retract
       and slide the two cable to the steering plate.

35

36

37

10.  Connect the metal rod to the servo retract.

4.  Install the adjustable servo connector to the
     servo arm of the servo retract gear.

INSTALLING THE nose gear retract

1. Trim the plastic wheel well.

7. Secure the nose retract.

12. Attach the rod to the servo arm.

13. Secure the wood plate.

14.  Make  the  same  way  for  installing  the  second 

retract gear.

    Attach the wing to the joiner tube and secure the 

wing panels to the fuselage.

11. Install the two cable to the servo steering arm.

2. Glue the wheel well by C.A glue.

3. Install the steering nose servo into the servo tray 

in the fuselage.

C.A glue

Steering nose servo

1.  We  highly  recommend  setting  up  a  plane  using 

the control throws listed.

2.   The  control  throws  should  be  measured  at  the 

widest   point of each control surface.

3.    Check  to  be  sure  the  control  surfaces  move  in 

the  correct directions.

   

    After  you  have  balanced  a  plane  on  the  C.G. 

You  should  laterally  balance  it.  Doing  this  will 
help the airplane track straighter.

1.  Turn the airplane upside down. Attach one loop 

of  heavy  string  to  the  engine  crankshaft  and 
one to the tail wheel wire. With the wings level, 
carefully lift the airplane by the string. This may 
require two people to make it easier.

!

CONTROL THROWS

LATERAL BALANCE

2.  If one  side  of the wing  fall, that side  is heavier 

than  the  opposite. Add  small  amounts  of  lead 
weight  to  the  bottom  side  of  the  lighter  wing 
half's  wing  tip.  Follow  this  procedure  until  the 
wing stays level when you lift the airplane.

5.  One set of the landing gear.

 

SECURE THE WING TO THE FUSELAGE

 

Gear close

 

Gear Open

5. Install the servo nose retract.

9.  Secure the axle.

Screw

Screw

Remover the 
covering

Remover the 
covering

Remover the 
covering

C.A glue

I/C FLIGHT GUIDELINES

Made in Vietnam

When  ready  to  fly,  first  extend  the 

transmitter aerial.

Operate  the  control  sticks  on  the 

transmitter  and  check  that  the  control 

surfaces  move  freely  and  in  the 

CORRECT directions.

ALWAYS  land  the  model  INTO  the 

wind, this ensures that the model lands 

at the slowest possible speed.

Switch on the transmitter.

Switch off the transmitter.

Check that the transmitter batteries 

have adequate power.

Switch off the receiver.

Switch on the receiver.

ALWAYS take off into the wind.

Check  that  the  wings  are  correctly 

fitted to the fuselage.

If the model does not respond correctly 

to  the  controls,  land  it  as  soon  as 

possible and correct the fault.

Empty the fuel tank after flying, fuel left 

in  the  tank  can  cause  corrosion  and 

lead to engine problems.

10

Instruction Manual

PC21 PILATUS

46

6.  After  the  epoxy  has  fully  cured,  remove  the 

masking  tape  or  T-pins  used  to  hold  the 
stabilizer in place and carefully inspect the glue 
joints.  Use  more  epoxy  to  fill  in  any  gaps  that 
were  not  filled  previously  and  clean  up  the 
excess  using  a  paper  towel  and  rubbing 
alcohol.

7.    Installing  the  elevator  using  C.A  glue  as 

installing the aileron.

48

C.A glue

C.A glue

47

 

INSTALLING THE RUDDER

Repeat step 1 - step 2 from the installing aileron
for the installing rudder.

 

INSTALLING THE LANDING GEAR

1.  Trim the plastic wheel well.

12mm

12mm

Servo retract

Servo arm

Silicone tube

M2 clevis

Retract

Metal rod

Adjustable servo 

connector

Gear strut

Control 
horn

Servo arm

Metal rod

Adjustable servo connector

Silicone tube

M2 clevis

Control horn

Retract

Servo retract

Gear strut

 

Gear close

 

Gear OPEN

Adjustable servo 

connector

Adjustable servo connector

Metal rod

Metal rod

Servo arm

Servo arm

Cable steering nose

Retract

Gear

Cable steering nose

Crimp

Crimp

Steering 

nose arm

Steering nose arm

Spring

Spring

Retract

138mm 

(5.4 in)

PC21 PILATUS

PC21 PILATUS

18

Instruction Manual

PC21 PILATUS

Elevator Control

Aileron Control

8mm 

8mm 

Rudder Control

20mm 

20mm 

9mm 

9mm 

Flap Control

15-20mm 

 Ailerons : 8 mm up 

8 mm down

 Elevator : 9 mm up 

9 mm down

 Rudder  : 20 mm right  20 mm left
 Flap       : 15-20 mm down

1. Completely charge your transmitter and receiver 

batteries  before your first day of flying.

2.    Check  every  bolt  and  every  glue  joint  in  your 

plane to ensure that everything is tight and well 
bonded.

3.   Double check the balance of the airplane. 

4.   Check the control surface.

5.    Check  the  receiver  antenna.  It  should  be  fully 

extended and not coiled up inside the fuselage.

6.   Properly balance the propeller.

FLIGHT PREPARATION PRE FLIGHT CHECK

BASIC CONNECTION FOR AIRPLANE AND ADJUSTMENT OF SERVOS

FOR YOUR RADIO INSTALLATION

Example of connection

For more information, refer to radio system instruction manual.

Follow instruction manual of Engine and Battery.

Flap Servo

Y-Harness

Switch

Receiver

Engine

Throttle Servo

Y-Harness

Battery (Receiver)

Flap Servo

Flap

Flap

Rudder

Rudder Servo

Elevator Servo

Elevator

Aileron Servo

Aileron Servo

Aileron

Aileron

Y-Harness

Y-Harness

Retract Gear Servo

Main retract

Nose retract

Nose servo

Summary of Contents for PC21 PILATUS

Page 1: ...mAh NiMH not included Servo mount 21mm x 42 mm Propeller suit with your engine Engine 61 91 2 stroke glow engine or 15 20cc gas engine not included Motor brushless outrunner 2200 W 500 KV not included Gravity CG 138 mm 5 4 in Back from the leading edge of the wing at the fuselage Control throw Ailerons Low 8mm up down 10 expo High 10mm up down 10 expo Control throw Elevators Low 9mm up down 12 exp...

Page 2: ...C A glue debonder and acetone Do not let these chemicals come in contact with the colors on the covering and the plastic parts SAFETY PRECAUTION This is not a toy Be sure that no other flyers are using your radio frequency Do not smoke near fuel Store fuel in a cool dry place away from children and pets Wear safety glasses The glow plug clip must be securely attached to the glow plug Do not flip t...

Page 3: ...o box for each of the four mounting screws Secure the servo tray in place using the mounting screws provided 2mm x 12mm 6 Repeat step 2 5 to install the second aileron servo in the opposite wing half 6 7 4 Using the thread as a guide and using masking tape tape the servo lead to the end of the thread carefully pull the thread out When you have pulled the servo lead out remove the masking tape and ...

Page 4: ...re cutters remove all but one of the arms Using a 2mm drill bit enlarge the third hole out from the center of the arm to accommodate the aileron pushrod wire 4 Plug the aileron servo into the receiver and center the servo Install the servo arm onto the servo The servo arm should be perpendicular to the servo and point toward the middle of the wing 5 Center the aileron and hold it in place using a ...

Page 5: ...l horn 4 14 Instruction Manual PC21 PILATUS 18 16 17 C A glue 3 Glue the wheel well by C A glue 4 Install the servo retract gear 2 Remove the covering from the bottom of the wing 19 15 Remove the covering M2 clevis 5 One set of the landing gear INSTALLING THE LANDING GEAR 1 Trim the plastic wheel well ...

Page 6: ...m of the servo retract gear 9 Secure the axle 8 Secure the wheel 10 Secure the wooden wheel cover 5 Instruction Manual PC21 PILATUS 12 Attach the rod to the servo arm Gear close 12mm Servo arm Metal rod Adjustable servo connector Silicone tube M2 clevis Control horn Retract Servo retract Gear strut ...

Page 7: ...ell 13 Secure the wood plate 14 Make the same way for installing the second retract gear Attach the wing to the joiner tube and secure the wing panels to the fuselage SECURE THE WING TO THE FUSELAGE Gear Open Servo retract Servo arm Silicone tube M2 clevis Retract Metal rod Adjustable servo connector Gear strut Control horn ...

Page 8: ...retract 35 36 4 Install the adjustable servo connector to the servo arm of the servo retract gear 7 Secure the nose retract 2 Glue the wheel well by C A glue 3 Install the steering nose servo into the servo tray in the fuselage C A glue Steering nose servo 5 Install the servo nose retract 9 Secure the axle Screw Screw 12mm ...

Page 9: ... two cable to the steering plate 37 10 Connect the metal rod to the servo retract 11 Install the two cable to the servo steering arm Gear close Gear OPEN Adjustable servo connector Adjustable servo connector Metal rod Metal rod Servo arm Servo arm Cable steering nose Retract Gear Cable steering nose Crimp Crimp Steering nose arm Steering nose arm Spring Spring Retract ...

Page 10: ...tabilizer is square and centered to the fuselage by taking measurements but don t glue anything yet Remover the covering Remover the covering 3 With the horizontal stabilizer correctly aligned mark the shape of the fuselage onto the bottom and into the top of the horizontal stabilizer using a water soluble non permanent felt tip pen 5 When you are sure that everything is aligned correctly mix up a...

Page 11: ... we suggest installing it into the engine at this time INSTALLING THE ENGINE Locate the long piece of wire used for the throttle pushrod One end of the wire has been pre bend in to a Z bend at the factory This Z bend should be inserted into the throttle arm of the engine when the engine is fitted onto the engine mount Fit the engine to the engine mount using the screws provided 50 OS 61 91 two str...

Page 12: ...TTERY This model can fly with electric here is our recommended for set up the system Motor brushless Rimfire 80 Lipo cells 6 cells 4000 5500 mAh not included ESC 60A 100A Installing the electric motor 53 55 56 ESC 54 Screw 52 16mm 50mm OS 15cc GT 70mm 57 Lipo Battery ...

Page 13: ...it falls into the tank 6 When satisfied with the alignment of the stopper assembly tighten the 3mm x 20mm machine screw until the rubber stopper expands and seals the tank opening Do not over tighten the assembly as this could cause the tank to split 7 Using a modeling knife cut 3 lengths of fuel line 150mm long Connect 2 lines to the 2 vent tubes and 1 line to the fuel pickup tube in the stopper ...

Page 14: ...d end of the pushrod until it reaches the exit slot Carefully reach in with a small screw driver and guide the pushrod out of the exit slot 4 Install the clevis into the two elevator pushrod Make sure 6mm of thread shows inside the clevis 5 The control horn should be mounted on the bottom left side and right side of the elevator at the leading edge in line with the elevator pushrod 6 Drill two hol...

Page 15: ...l two holes through the rudder using the control horn as a guide and screw the control horn in place 7 Attach clevis to the third hole in the control horn Install a silicone tube on the clevis 5 The control horn should be mounted on the left side of the rudder at the leading edge in line with the rudder pushrod 68 69 8 Locate one nylon servo arm and using wire cutters remove all but one of the arm...

Page 16: ...out for engine head clearance needle valve muffler Remove the cowl and make these cutouts using a rotary tool with a cutting disc and a rotary sanding drum attachment 3 Slide the cowl back into place Align the front of the cowl with the crankshaft of the engine The front of the cowl should be positioned so the crankshaft is in the middle of the precut opening Hold the cowl firmly in place using se...

Page 17: ... PC21 PILATUS 74 Screw 75 Receiver Switch 76 Open and close 77 78 79 C A glue 80 81 C A glue open and close the canopy GLUeing the expand part of horizontal and vertical stabilizer Remover the covering Remover the covering ...

Page 18: ...y To correct this move the battery and receiver forward or if this is not possible stick weight into the firewall When balanced correctly the airplane should sit level or slightly nose down when you lift it up with your fingers 1 We highly recommend setting up a plane using the control throws listed 2 The control throws should be measured at the widest point of each control surface 3 Check to be s...

Page 19: ... Check the control surface 5 Check the receiver antenna It should be fully extended and not coiled up inside the fuselage 6 Properly balance the propeller FLIGHT PREPARATION PRE FLIGHT CHECK BASIC CONNECTION FOR AIRPLANE AND ADJUSTMENT OF SERVOS FOR YOUR RADIO INSTALLATION Example of connection For more information refer to radio system instruction manual Follow instruction manual of Engine and Ba...

Page 20: ...s at the slowest possible speed Switch on the transmitter Switch off the transmitter Check that the transmitter batteries have adequate power Switch off the receiver Switch on the receiver ALWAYS take off into the wind Check that the wings are correctly fitted to the fuselage If the model does not respond correctly to the controls land it as soon as possible and correct the fault Empty the fuel ta...

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