Instruction Manual
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
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:
1. Please trial fit all the parts. Make sure you have
2. The painted and plastic parts used in this kit are
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.
SPECIFICATION
- Wingspan: 1400mm (55.1 in)
- Length: 1540mm (60.6 in)
- Flying weight: 4.8-5.2 kg
- Wing area: 40dm2
- Wing loading: 125g/dm2
- Wing type: Naca airfoils
- Covering type: Genuine ORACOVER®
- Retract gear type: Electric retract gear (not
included); CNC Suspension Metal Struts (included)
- Radio: 6 - 9 channel . 8 mini hi-torque servo:
2 aileron; 2 flap; 2 elevator; 1 rudder;
1 steering nose; (not included)
- Servo mount : 12mm x 24mm
- Engine: edf 90mm with minimum thrust up 4 kg ;
8-12 cells (not included)
- Gravity CG: 165-170 mm (6.2-6.7 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: 8mm up/down,
12% expo; High: 10mm up/down, 12% expo
- Control throw Rudder: Low: 20mm right/left,
15% expo; High: 20mm right/left, 15% expo
- Control throw Flaps: Mid: 15mm down;
Landing: 20mm down
- Experience level: advanced
RECOMMENDED EDF AND BATTERY SET UP
- EDF: 90mm, Minimum thrust 4 kg. Midi-Fan evo/
HET 650-68-1130 WeMoTec (not included)
- Lipo cell: 8-12 cells / 4000mAh 60C (not included)
- Esc 120-160 A Phoenix Castle (not included)
I n s t r u c t i o n M a n u a l
2
PRECEPTOR 90MM
Instruction Manual
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
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:
1. 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 PRECEPTOR EDF 90MM ARF
SCALE 1:7 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.
2. 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.
1
• 2 bender plier
• Wire cutters
• Masking tape
• Thread lock
• Paper towels
• Rubbing alcohol
PREPARATIONS
Remove the tape and separate the ailerons
from the wing and the elevators from the stab.
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
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
1
Instruction Manual
3. Place the servo into the servo tray. Center the
INSTALLING THE AILERON SERVOS
1. Install the rubber grommets and brass eyelets
2. Using a modeling knife, remove the covering
4. Using the thread as a guide and using masking
7
To the cowl
PRECEPTOR 90MM
Instruction Manual
2
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
3
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.
4
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
5
5. Place the aileron servo tray / hatch into the
servo box on the bottom of the wing and drill
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.
INSTALLING THE CONTROL HORNS
1. Remove the covering from the slot on the
bottom of the aileron.
2. Insert the control horn into the slot and secure it
by using C.A glue.
6
To the cowl
8
Remove the covering
Instruction Manual
INSTALLING THE AILERON LINKAGES
1. Working with the aileron linkage for now, thread
INSTALLING THE CONTROL HORNS for flap
Repeat step #1 - #3 from installing the control
3. Repeat step # 1 - # 2 to install the control horn
PRECEPTOR 90MM
Instruction Manual
3
INSTALLING THE AILERON LINKAGES
1. Working with the aileron linkage for now, thread
one clevis at least 14 turns onto one of the
threaded wires.
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
13
10
11
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.
12
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 LINKAGE
Repeat step #1 - #9 from installing the aileron
linkage to install the flap linkage.
9
3. Repeat step # 1 - # 2 to install the control horn
on the opposite aileron.
C.A glue
control
Instruction Manual
INSTALLING THE LANDING GEAR
In case you want to use with the. Electric retract
(not included with the kit), please pay attention with
the dimension as picture below
PRECEPTOR 90MM
Instruction Manual
4
INSTALLING THE LANDING GEAR
20
18
19
Remove the covering
1. The retract set (Electric retract not included with
the kit).
2. Remove the covering.
21
14
15
Not included
C.A glue
3. Trim the plastic cover.
4. Glue the plastic cover.
16
17
In case you want to use with the. Electric retract
(not included with the kit), please pay attention with
the dimension as picture below
.
5. Secure the retract to the wing.
6. Install and secure the wheel.
Instruction Manual
7. Secure the strut to the retract.
8. Lock-up the axle.
Instruction Manual
3. Install the servo.
4. Secure the servo plate.
6. Remove the covering.
5. Make the same way for the second stabilizer.
22
23
Screw
Screw
5. Secure the retract to the wing.
6. Install and secure the wheel.
INSTALLING THE HORIZONTAL STABILIZER
PRECEPTOR 90MM
Instruction Manual
5
25
Screw
24
Screw
1. Repeat these step from the installing aileron for
the installing elevator.
27
C.A glue
28
Remove the covering
2. Remove the covering.
7. Secure the strut to the retract.
8. Lock-up the axle.
26
Machine screw
9. Secure the wooden plate.
Instruction Manual
10. Install the horizontal stabilizer and glue it
PRECEPTOR 90MM
Instruction Manual
6
34
8. Repeat these step from installing the aileron
linkages to install the elevator linkages.
9. Remove the rear of the covering.
33
C.A glue
36
Remove the covering
35
7. Install and glue the elevator control horn.
30
3. Install the servo.
4. Secure the servo plate.
32
Remove the covering
29
Screw
31
6. Remove the covering.
5. Make the same way for the second stabilizer.
PRECEPTOR 90MM
Instruction Manual
7
INSTALLING THE VERTICAL STABILIZER
1. Repeat these step from the installing aileron for
the installing rudder.
40
C.A glue
41
Remove the covering
2. Remove the covering.
42
3. Install the rudder servo.
Screw
39
Epoxy glue
10. Install the horizontal stabilizer and glue it
using epoxy glue.
37
Remove the covering
38
Servo lead
Instruction Manual
2. Remove the plastic.
3. C.A glue plastic.
INSTALLING THE STEERING NOSE gear
1. Install the steering nose servo into the servo
9. Install the vertical stabilizer and glue it using
epoxy glue.
50
Epoxy glue
49
Servo lead
PRECEPTOR 90MM
Instruction Manual
47
8
8. Remove the covering.
48
Remove the covering
Remove the covering
43
46
7. Repeat these step from installing the aileron
linkages to install the rudder linkages.
4. Secure the servo plate.
5. Remove the covering.
45
C.A glue
44
Remove the covering
6. Install and glue the rudder control horn.
Instruction Manual
INSTALLING THE EDF (Electric ducted fan)
system
1. Trim 1 hole from the air outlet for the wires of EDF.
2. Slide the air outlet to the fuselage.
PRECEPTOR 90MM
Instruction Manual
9
4. Secure the strut to the electric retract and slide
the two cable to the steering plate.
55
Crimp
6. Secure the alxe.
7. Slide and install the two cable steering nose to
the servo.
M3
58
Screw
57
5. Install the nose retract.
56
Screw
52
53
Remove the plastic
C.A glue
54
2. Remove the plastic.
3. C.A glue plastic.
51
INSTALLING THE STEERING NOSE gear
1. Install the steering nose servo into the servo
tray in the fuselase.
63
65
64
66
Screw
PRECEPTOR 90MM
Instruction Manual
10
3. Slide the air inlet to the fuselage.
4. Tie down the sponge (included with the kit) to the
EDF,(Must fit with the air inlet) and fix it with the tape.
5. Secure the EDF.
60
61
Hole
Air outlet
EDF
Air inlet
62
INSTALLING THE EDF (Electric ducted fan)
system
59
1. Trim 1 hole from the air outlet for the wires of EDF.
2. Slide the air outlet to the fuselage.
8. Trim the plastic cover.
9. Glue the plastic cover.
6. Wooden belt for EDF (Included with the kit).
7. Secure the belt to the fuselage.
Instruction Manual
68
8. Trim the plastic cover.
9. Glue the plastic cover.
69
70
C.A glue
Screw
67
6. Wooden belt for EDF (Included with the kit).
7. Secure the belt to the fuselage.
72
10. Fix the air outlet.
11. Cut the hole on the fuselage for air inlet.
12. Glue the plastic cover.
13. Glue the wooden plate onto the vertical stabilizer.
Remove the covering
71
C.A glue
73
74
C.A glue
PRECEPTOR 90MM
Instruction Manual
11
C.A glue
Instruction Manual
OPEN AND CLOSE the canopy
BALANCING
1. It is critical that your airplane be balanced
2. Mount the wing to the fuselage. Using a couple
3. Turn the airplane upside down. Place your
4. If the nose of the plane falls, the plane is nose
Instruction Manual
Aileron Control
8mm
8mm
Rudder Control
20mm
20mm
Flap Control
15mm
Elevator Control
8mm
8mm
PRECEPTOR 90MM
Instruction Manual
12
LATERAL BALANCE
After you have balanced a plane on the C.G.
You should laterally balance it. Doing this will
help the airplane track straighter.
5. 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.
6. 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.
CONTROL THROWS
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.
Ailerons : 8mm up 8mm down
Elevator : 8mm up 8mm down
Rudder : 20mm right 20mm left
Flap T/O: 15mm - Landing 20mm
LOW RATE
OPEN AND CLOSE the canopy
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
165-170mm BACK FROM THE LEADING
EDGE OF THE WING, AT THE FUSELAGE.
This location is recommended for initial test
flying and trimming. 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 165-170mm 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.
75
Open and Close
165-170mm
FLIGHT PREPARATION PRE FLIGHT CHECK
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.
PRECEPTOR 90MM
Instruction Manual
13
Ailerons : 10mm up 10mm down
Elevator : 10mm up 10mm down
Rudder : 20mm right 20mm left
Hi RATE
Always operate in open areas, away
from factories, hospitals, schools,
buildings and houses etc. NEVER fly
your aircraft close to people or built
up areas.
NEVER fly in wet conditions or on
windy or stormy days.
When ready to fly, first extend the
transmitter aerial.
Switch on the transmitter.
Switch on the receiver.
Check that the wings are correctly
fitted to the fuselage.
I/C FLIGHT WARNINGS
Always operate in open areas, away
from factories, hospitals, schools,
buildings and houses etc. NEVER fly
your aircraft close to people or built
up areas.
THE PROPELLER IS DANGEROUS
Keep fingers, clothing (ties, shirt
sleeves, scarves) or any other loose
objects that could be caught or drawn
in, away from the propeller. Take care
at ALL times.
Keep all onlookers (especially small
children and animals) well back from
the area of operation. This is a flying
aircraft, which will cause serious
injury in case of impact with a person
or animal.
NEVER fly near power lines, aerials
or other dangerous areas including
airports, motorways etc.
NEVER use damaged or deformed
propellers or spinners.
DO NOT dispose of empty fuel
containers on a fire, this can lead to
an explosion.
NEVER fly in wet conditions or on
windy or stormy days.
ALWAYS adjust the engine from
behind the propeller, and do not allow
any part of your body to be in line
with the propeller.
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.
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