Hand-made Almost Ready to Fly R/C Model Aircraft
ASSEMBLY MANUAL
Made in Vietnam.
Kit features
• Ready-made—minimal assembly & finishing required.
• Ready-covered covering.
• Factory-installed engine mount.
• Photo-illustrated step-by-step Assembly Manual.
HARRIER 3D
Specifications
Wingspan---------------------------------------- 60.5 in---------------------------- 154cm.
Wing area-------------------------------- 948.38 sq.in-------------------- 61.18 sq.dm.
Approximate flying weight--------------------7-8lbs--------------------- 3.17-3.62kg.
Length----------------------------------------------- 66 in------------------------ 167.64cm.
Recommended engine size--------- .61-1.00 cu. in---------------------- 2-stroke.
--------- .91-1.10 cu.in----------------------- 4-stroke.
Radio System required 4 channel with 6 servos.
Flying skill level Intermediate/advanced.
HARRIER 3D Instruction Manual
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INTRODUCTION
Thank you for choosing the Harrier 3D ARTF by SEAGULL MODELS. The Harrier 3D was designed
with the intermediate/advanced sport flyer in mind. It is a 3D airplane which is easy to fly and quick
to assemble. The airframe is conventionally built using balsa, plywood and veneer to make it stronger
than the average ARTF , yet the design allows the aeroplane to be kept light. You will find that most
of the work has been done for you already. The motor mount has been fitted and the hinges are preinstalled . Flying the Harrier 3D is simply a joy.
This instruction manual is designed to help you build a great flying aeroplane. Please read this
manual thoroughly before starting assembly of your Harrier 3D . Use the parts listing below to
identify all parts.
WARNING
Please be aware that this aeroplane is not a toy and if assembled or used incorrectly it is
capable of causing injury to people or property. WHEN YOU FLY THIS AEROPLANE YOU
ASSUME ALL RISK & RESPONSIBILITY.
If you are inexperienced with basic R/C flight we strongly recommend you contact your R/C supplier
and join your local R/C Model Flying Club. R/C Model Flying Clubs offer a variety of training
procedures designed to help the new pilot on his way to successful R/C flight. They will also be able
to advise on any insurance and safety regulations that may apply.
ADDITIONAL ITEMS REQUIRED
.61-1.00 2-stroke engine
.91-1.10 4-stroke engine
Computer radio with six servos
Glow plug to suit engine
Propeller to suit engine
Protective foam rubber for radio
system
Silicone fuel line
TOOLS & SUPPLIES NEEDED
Thick cyanoacrylate glue
30 minute epoxy
5 minute epoxy
Hand or electric drill
Assorted drill bits
Modelling knife
Straight edge ruler
2mm ball driver
Phillips head screwdriver
220 grit sandpaper
90° square or builder’s triangle
Wire cutters
Masking tape & T-pins
Thread-lock
Paper towels
PARTS LISTING
FUSELAGE ASSEMBLY
(1) Fuselage
(1) Canopy hatch
WING ASSEMBLY
(1) Right wing half with pre-installed
aileron
(1) Left wing half with pre-installed
aileron
(2) Aluminium dihedral brace
Tail section assembly
(1) Vertical stabilizer with pre-
installed rudder
(1) Horizontal stabilizer with pre-
installed elevator halves
Some more parts.
HARDWARE PACK
COWLING
Landing gear.....
HARRIER 3D Instruction Manual
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NOTE: To avoid scratching your new aero-
plane we suggest that you cover your
workbench with an old towel. Keep a
couple of jars or bowls handy to hold
the small parts after you open the
bags.
Please trial fit all parts. Make sure you
have the correct parts and that they
fit and are aligned properly before
gluing! This will ensure proper assembly as the Harrier 3D is made
from natural materials and minor adjustments may have to be made.
The paint and plastic parts used in
this kit are fuel proof. However, they
are not tolerant of many harsh chemicals including the following: paint
thinner, cyano-acrylate glue accelerator, cyanoacrylate glue de-bonder
and acetone. Do not let these chemicals come in contact with the colours
on the covering and the plastic parts.
HARRIER 3D Instruction Manual
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4)Deflect the aileron and completely
saturate each hinge with thin C/A glue. The
ailerons front surface should lightly contact the
wing during this procedure. Ideally, when the
hinges are glued in place, a 1/64” gap or less
will be maintained throughout the lengh of the
aileron to the wing panel hinge line.
Note:
The control surfaces, including the
ailerons, elevators, and rudder, are
prehinged with hinges installed, but the
hinges are not glued in place. It is
imperative that you properly adhere the
hinges in place per the steps that follow
using a high-quality thin C/A glue.
1) Carefully remove the aileron from one
of the wing panels. Note the position of the
hinges.
2) Remove each hinge from the wing panel
and aileron and place a T-pin in the center of
each hinge. Slide each hinge into the aileron
until the T -pin is snug against the aileron. This
will help ensure an equal amount of hinge is
on either side of the hinge line when the aileron
is mounted to the wing panel.
HINGING THE AILERONS
Note:
The hinge is constructed of a special
material that allows the C/A to wick or
penetrate and distribute throughout the
hinge, securely bonding it to the wood
structure of the wing panel and aileron.
3) Slide the aileron on the wing panel until
there is only a slight gap. The hinge is now
centered on the wing panel and aileron.
Remove the T-pins and snug the aileron
against the wing panel. A gap of 1/64” or less
should be maintained between the wing panel
and aileron.
5) T urn the wing panel over and deflect the
aileron in the opposite direction from the
opposite side. Apply thin C/A glue to each
hinge, making sure that the C/A penetrates into
both the aileron and wing panel.
6) Using C/A remover/debonder and a
paper towel, remove any excess C/A glue that
may have accumulated on the wing or in the
aileron hinge area.
HARRIER 3D Instruction Manual
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8) After both ailerons are securely hinged,
firmly grasp the wing panel and aileron to
make sure the hinges are securely glued and
cannot be pulled out. Do this by carefully
applying medium pressure, trying to separate
the aileron from the wing panel. Use caution
not to crush the wing structure.
Note:
Work the aileron up and down several
times to “work in” the hinges and check
for proper movement.
7) Repeat this process with the other wing
panel, securely hinging the aileron in place.
1) Carefully remove the elevator from one
of the horizontal stabilizer panels. Note the
position of the hinges.
2) Remove each hinge from the horizontal
stabilizer panel and elevator and place a T -pin
in the center of each hinge. Slide each hinge
into the elevator until the T -pin is snug against
the elevator. This will help ensure an equal
amount of hinge is on either side of the hinge
line when the elevator is mounted to the
horizontal stabilizer panel.
HINGING THE ELEVA T ORS
3) Slide the elevator on the horizontal
stabilizer panel until there is only a slight gap.
The hinge is now centered on the horizontal
stabilizer panel and elevator. Remove the Tpins and snug the elevator against the
horizontal stabilizer panel. A gap of 1/64” or
less should be maintained between the
horizontal stabilizer panel and elevator .
4)Deflect the elevator and completely
saturate each hinge with thin C/A glue. The
elevators front surface should lightly contact
the horizontal stabilizer during this procedure.
Ideally , when the hinges are glued in place, a
1/64” gap or less will be maintained throughout
the lengh of the elevator to the horizontal
stabilizer panel hinge line.
Note:
The hinge is constructed of a special
material that allows the C/A to wick or
penetrate and distribute throughout the
hinge, securely bonding it to the wood
structure of the horizontal stabilizer
panel and elevator .
5) Turn the horizontal stabilizer p anel over
and deflect the elevator in the opposite
direction from the opposite side. Apply thin CA
glue to each hinge, making sure that the C/A
penetrates into both the elevator and horizontal
stabilizer panel.
HARRIER 3D Instruction Manual
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6) Using C/A remover/debonder and a
paper towel, remove any excess C/A glue that
may have accumulated on the horizontal
stabilizer or in the elevator hinge area.
8) After both horizontal stabilizer are
securely hinged, firmly grasp the horizontal
stabilizer panel and elevator to make sure the
hinges are securely glued and cannot be pulled
out. Do this by carefully applying medium
pressure, trying to separate the elevator from
the horizontal stabilizer panel. Use caution not
to crush the horizontal stabilizer structure.
7) Repeat this process with the other
horizontal stabilizer panel, securely hinging the
elevator in place.
Using a small weight (Weighted fuel pick-up
works well) and thread, feed the string through
the wing as indicated.
INST ALLING THE AILERON SERVOS
Attach a 12 inch servo lead to the aileron servo.
Attach the string to the servo lead and carefully
thread it though the wing. Once you have
thread the lead throught the wing, remove the
string so it can use for the other servo lead.
Tape the servo lead to the wing to prevent it
from falling back into the wing.
HARRIER 3D Instruction Manual
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Because the size of servos differ,
you may need to adjust the size of
the precut opening in the mount. The
notch in the sides of the mount allow the
servo lead to pass through.
2) Install the aileron servo into the servo
mount, with the output shaft towards the leading edge of the wing, using the wood screws
provided with your radio system. Drill 1mm
pilot holes through the mount.
Repeat the procedure for the other wing
half.
AILERON LINKAGE
INST ALLING THE AILERON LINKAGE
1) Using a ruler & pen to draw a straight
line as below picture.
2) Locate the nylon control horns,nylon
control horn backplates and two machine
screws.
3) Position the aileron horn on the bot-
tom side of aileron. The clevis attachment
holes should be positioned over the hinge line.
4) Using a 1.5mm drill bit and the control
horns as a guide, drill the mounting holes
through the aileron halves.
6)Thread one nylon adjustable control
horn on to each aileron control rod. Thread
the horns on until they are flush with the ends
of the control rods.
5) Mount the control horns by inserting
the bolts through the control horn bases and
aileron halves, then into the mounting
backplates. Do Not overtighten the nuts or the
backplates may crush the wood.
1) Install the rubber grommets and brass
collets onto the aileron servo. Test fit the servo
into the aileron servo mount.
(2) 2MMx30mm.
Control Horn.
Mounting Screws.
Mounting Plate.
Straight line.
HARRIER 3D Instruction Manual
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PARTS REQUIRED
FUEL TANK
{1} Molded Nylon Fuel T ank
{1} Preassembled Stopper Assembly
{1} Metal Weighted Pick-Up
{1} Silicon tube
INST ALLING THE STOPPER ASSEMBL Y
1) Using a modeling knife, carefully cut of f
the rear portion of one of the 3 nylon tubes
leaving 1/2” protruding from the rear of the
stopper. This will be the fuel pick up tube.
2) Using a modeling knife, cut one length
of silicon fuel line. Connect one end of the
line to the weighted fuel pickup and the other
end to the nylon pickup tube.
3) Carefully bend the second nylon tube
up at a 45º angle. This tube is the vent tube.
HARRIER 3D Instruction Manual
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5) With the stopper assembly in place, the
weighted pickup should rest away from the
rear of the tank and move freely inside the tank.
The top of the vent tube should rest just below
the top of the tank. It should not touch the top
of 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
overtighten the assembly as this could cause
the tank to split.
Carefully use a lighter or heat gun to
permenently set the angle of the vent tube.
Important: 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.
4) 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 falls into the tank.
Slide the tank into the fuselage from inside so
that the neck is at the top of the fuselage and
it locates through the engine bulkhead. Gently
secure it to the top horizontal former with a
cable tie.
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.
You should mark which tube is the vent and
which is the fuel pickup when you attach fuel
tubing to the tubes in the stopper. Once the
tank is installed inside the fuselage, it may be
difficult to determine which is which.
Attach the silicone fuel and pressure pipes to
the tank. The lower pipe is the ‘feed’ and the
upper two the ‘pressure and fill’. The fill pipe
is the next pipe.
HARRIER 3D Instruction Manual
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WHEEL AND WHEEL PANTS
1) Assemble and mounting the wheel pants
as shown in the following pictures.
2) Follow diagram below for wheel pant
installation:
3) You have to trim each axle using a toll
cutting and cut-off wheel.
4) A drop of C/A glue on the wheel collar
screws will help keep them from coming lose
during operation.
Repeat the process for the other wheel.
Wheel Collar.
Axle.
Wheel.
Nut.
Wheel Pant.
Landing Gear.
Nut.
(2) Washer .
8 mm.
(2) Wheel Collar.
Axle.
Wheel.
Nut.
Nut.
(2) Washer .
Landing gear.
Caution when cutting the axles and wear
protective goggles.
46mm
HARRIER 3D Instruction Manual
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MOUNTING THE ENGINE
1)Trial fit your engine on the motor mount.
The engine should be positioned so there is
ample clearance in the cowling for spinner
backplate mounted to the prop drive shaft.
2)Marking 4 points on the plastic motor
mount.
3)Screw 4 pilot holes with 5 mm diameter.
4) Secure your engine on the motor mount
by mounting with 4 bolts, 8 washers, and 4
nuts provided.
A drop C/A glue on the bolt threads will help
prevent loosening in flight.
5) Attach the Z-Bend in the pushrod wire
to the throttle arm on the carburetor. You will
need to remove the throttle arm from the carburetor to be able to attach the Z-bend. When
complete, reattach the throttle arm to the carburetor.
PARTS REQUIRED
COWLING
{1} Molded Fiberglass Cowling
{4} 3mm x 12mm Wood Screws
1) Slide the fiberglass cowl over the engine and line up the back edge of the cowl with
the marks you made on the fuselage.
INST ALLING THE MAIN LANDING GEAR
1) The blind nuts for securing the landing
gear are already mounted inside the fuselage.
2) Using the hardware provided, mount
the main landing gear to the fuselage.
131mm
HARRIER 3D Instruction Manual
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2) While keeping the back edge of the cowl
flush with the marks, 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 nearly the middle of the cowl opening. Use the spinner backplate as a guide. Hold
the cowl firmly in place using pieces of masking tape.
Because of the size of the cowl, it may
be necessary to use a needle valve extension for the high speed needle valve. Make
this out of sufficient length 1.5mm wire and
install it into the end of the needle valve. Secure the wire in place by tightening the set
screw in the side of the needle valve.
3) Install the muffler and muffler extension
onto the engine and make the cutout in the
cowl for muffler clearance. Connect the fuel
and pressure lines to the carburetor, muffler
and fuel filler valve. Secure the cowl to fuselage using the 3mmx12mm screws (4).
1) Install the spinner backplate, propeller
and spinner cone. The spinner cone is held in
place using two 3mm x 12mm wood screws.
The propeller should not touch any part
of the spinner cone. If it does, use a
sharp modeling knife and carefully trim away
the spinner cone where the propeller comes
in contact with it.
This item is not included.
INSTALLING THE SPINNER
Hard wood block.
HARRIER 3D Instruction Manual
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Because the size of servos differ, you may
need to adjust the size of the precut opening
in the mount. The notch in the sides of the
mount allow the servo lead to pass through.
THROTTLE SERVO INST ALL TION
1) Install adjustable servo connector in
the servo arm.
3) Secure the servos with the screws provided with your radio system.
2) Install the rubber grommets and brass
collets onto the throttle servo. T est fit the servo
into the aileron servo mount.
3) Secure the servos with the screws pro-
vided with your radio system.
4) Install the pushrod throttle.
1) Locate and cut out the covering film
from the servo holes in both sides of fuselage.
Adjustable Servo connector.
Servo arm.
ELEVATOR - RUDDER SERVO
INSTALLATION
2) Install the rubber grommets and brass
collets onto the aileron servo. Test fit the servo
into the aileron servo mount.
Because the size of servos differ, you may
need to adjust the size of the precut opening
in the mount. The notch in the sides of the
mount allow the servo lead to pass through.
HARRIER 3D Instruction Manual
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2)Using a modeling knife, carefully remove
the covering at mounting slot of horizontal stabilizer ( both side of fuselage).
6) Using a modeling knife, carefully remove the covering that overlaps the stabilizer
mounting platform sides in the fuselage. Remove the covering from both the top and the
bottom of the platform sides.
7) When you are sure that everything is
aligned correctly, mix up a generous amount
of 30 Minute Epoxy. Apply a thin layer to the
top and bottom of the stabilizer mounting area
and to the stabilizer mounting platform sides
in the fuselage. Slide the stabilizer in place
and realign. Double check all of your measurements once more before the epoxy cures.
Hold the stabilizer in place with T-pins or masking tape and remove any excess epoxy using
a paper towel and rubbing alcohol.
8) After the epoxy has fully cured, remove the masking tape or T-pins used to hold
the stabilizer in place. Carefully inspect the
glue joints. Use more epoxy to fill in any gaps
that may exist that were not filled previously
and clean up the excess using a paper towel
and rubbing alcohol.
When cutting through the covering to remove
it, cut with only enough pressure to only cut
through the covering itself. Cutting into the
balsa structure may weaken it.
3) Slide the stabilizer into place in the precut slot in the rear of the fuselage. The stabilizer should be pushed firmly against the front
of the slot.
4) With the stabilizer held firmly in place,
use a pen and draw lines onto the stabilizer
where it and the fuselage sides meet. Do this
on both the right and left sides and top and
bottom of the stabilizer.
HORIZONTAL STABILIZER
1) Using a ruler and a pen, locate the
centerline of the horizontal stabilizer , at the trailing edge, and place a mark. Use a triangle
and extend this mark, from back to front,
across the top of the stabilizer. Also extend
this mark down the back of the trailing edge
of the stabilizer.
5) Remove the stabilizer . Using the lines
you just drew as a guide, carefully remove the
covering from between them using a modeling knife.
HARRIER 3D Instruction Manual
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CONTROL HORN INSTALLTION
1) Locate the two nylon control horns, two
nylon control horn backplates and four
machine screws.
2) Position the elevator horn on the both
side of elevator. The clevis attach- ment holes
should be positioned over the hinge line.
HINGING THE RUDDER
1) Carefully remove the rudder from one of
the fuselage panel. Note the position of the
hinges.
2) Remove each hinge from the fuselage
panel and rudder and place a T -pin in the center
of each hinge. Slide each hinge into the rudder
until the T-pin is snug against the rudder. This
will help ensure an equal amount of hinge is
on either side of the hinge line when the rudder
is mounted to the fuselage .
3) Slide the rudder on the fuselage panel
until there is only a slight gap. The hinge is
now centered on the fuselage panel and rudder.
Remove the T-pins and snug the rudder
against the fuselage panel. A gap of 1/64” or
less should be maintained between the
fuselage panel and rudder.
4)Deflect the rudder and completely
saturate each hinge with thin C/A glue. The
rudder front surface should lightly contact the
fuselage during this procedure. Ideally, when
the hinges are glued in place, a 1/64” gap or
less will be maintained throughout the lengh
of the rudder to the fuselage panel hinge line.
Note: The hinge is constructed of a special
material that allows the C/A to wick or penetrate
and distribute throughout the hinge, securely
bonding it to the wood structure of the fuselage
panel and rudder.
5) T urn the fuselage panel over and deflect
the rudder in the opposite direction from the
opposite side. Apply thin C/A glue to each
hinge, making sure that the C/A penetrates into
the rudder and fuselage panel.
6) Using C/A remover/debonder and a
paper towel, remove any excess C/A glue that
may have accumulated on the fuselage or in
the rudder hinge area.
Work the rudder up and down several
times to “work in” the hinges and check
for proper movement.
Note:
2MM x 20MM.
HARRIER 3D Instruction Manual
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3) Using a 1.5mm drill bit and the control
horns as a guide, drill the mounting holes
through the elevator halves.
Control Horn.
Mounting Screws.
Mounting Plate.
3) Connect the elevator and rudder servos
to your radio’s receiver and turn on the system. Set the trim tabs on the transmitter to
neutral and center the servo arms. The elevator and rudder servo arms should be perpendicular to the servos.
4) One at a time, hold the pushrods in position over the respective servos to check for
proper servo direction. If any servo turns in
the wrong direction, switch your radio’s reversing switches as necessary to achieve the
correct direction.
4) Mount the control horns by inserting the
bolts through the control horn bases and
elevator halves, then into the mounting
backplates. Do not overtighten the nuts or the
backplates may crush the wood.
5) Position the rudder control horn on the
left side of the airplane. Mount the control horn
parallel with the horizontal stabilizer .
6) Install the rudder control horn using the
same method as with the elevator control
horns.
2) Elevator pushrods assembly follow
pictures below.
1) Thread one nylon adjustable control
horn on to each aileron control rod. Thread
the horns on until they are flush with the ends
of the control rods.
ELEVA TOR - RUDDER PUSHROD INST ALLATION
Elevator control horn.
Rudder control horn.
13 mm.
HARRIER 3D Instruction Manual
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1) Set the tail wheel assembly in place on
the plywood plate. The pivot point of the tail
wheel wire should be even with the rudder
hinge line and the tail wheel bracket should
be centered on the plywood plate.
2 Using a pen, mark the locations of the
two mounting screws. Remove the tail wheel
bracket and drill 1mm pilot holes at the locations marked.
MOUNTING THE TAIL WHEEL BRACKET
3) Secure the tail wheel bracket in place
using two 3mm x 15mm wood screws. Be
careful not to overtighten the screws.
1) Align the tail wheel wire so that the wire
is parallel with the bottom of the rudder. The
control clasp has a predrilled hole through the
top of it. Slide this hole onto the tail wheel wire
while sliding the clasp over the bottom of the
rudder.
MOUNTING THE CONTROL CLASP
2) Using a ruler and a pen place a mark
onto the bottom of the rudder, in front of the
rear edge of the tail wheel wire. The back edge
of the clasp should line up with this mark.
Y ou may find it necessary to bend the tail wheel
wire down slightly so it lines up with the clasp
without binding.
3) While holding the clasp firmly in place,
use a pen and outline the clasp onto the rudder.
4) Remove the clasp, and using a modeling knife, remove the covering from inside the
lines you drew. Use 220 grit sandpaper and
carefully roughen the inside surface of the nylon clasp.
INSTALLING TAIL STRUST SUPPORT
Tail strut system assembly follow pictures
below:
5) Rudder pushrods assembly follow
picture below.
5) Slide the clasp back into position and
carefully glue it into place using Kwik Bond Thin
C/A. Hold the clasp in place until the glue completely cures. Rescue the clap with bolt and
nut as picture below.
M3 x 4cm.
M3 x 4cm.
HARRIER 3D Instruction Manual
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LOCK CABLE.
M3 x 4cm.
M3 x 4cm.
M3 x 3cm.
UPPER AND BOTTOM OF
HORIZONTAL FIN.
M3 x 3cm.
CABLE.
CABLE
LOCK.
M3 x 4cm.
M3 x 4cm.
HARRIER 3D Instruction Manual
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FUSELAGE
BOTTOM.
UPPER
OF FUSELAGE.
See pictures detail ( pic. 1-2)
ATTACHMENT WING-FUSELAGE
See pictures below:
Picture 2:
M3 nut.
M3 Clevis.
Picture 1:
M3 Clevis.
M3 nut.
Picture 1:
LOCK CLEVIS.
HARRIER 3D Instruction Manual
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CANOPY HATCH
1) Plug the six servo leads and the switch
lead into the receiver. Plug the battery pack
lead into the switch also.
2 Wrap the receiver and battery pack in
the protective foam rubber to protect them
from vibration.
INSTALLING THE RECEIVER AND BA TTERY
3) Position the battery pack in the fuel
tank compartment and the receiver just behind the fuel tank . Use extra foam pieces to
hold them in position.
Antenna
Rubber
Band
Modified
Servo Arm
Cut
When balancing the airplane you may
need to move the battery or receiver forward or after to achieve proper balance.
4) Using a 1/16” drill bit, drill a hole through
the side of the fuselage, near the receiver, for
the antenna to exit. Route the antenna out of
the fuselage and secure it to the vertical stabilizer using a rubber band and a modified servo
arm. See picture as below.
INSTALLING THE SWITCH
Install the switch into the precut hole in the
fuselage side. Use the two screws provided
with the switch to secure it in place. Drill two
3/32” holes through the tray for the screws to
pass through.
Wing bolts( 4 pcs).
Switch.
HARRIER 3D Instruction Manual
21
CONTROL THROWS
1) We highly recommend setting up the
Harrier 3D using the control throws listed at
right. We have listed control throws for both
Low Rate (initial test flying/sport flying) and
High Rate (aerobatic flying).
2) Turn on the radio system, and with the
trim tabs on the transmitter in neutral, center
the control surfaces by making adjustments
to the clevises or adjustable servo connectors. The servo arms should be centered also.
correct this, move the battery and receiver forward orif this is not possible, stick weight onto
the firewall or use a brass heavy hub spinner
hub, similar to those offered by Harry Higley.
When balanced correctly, the airplane should
sit level or slightly nose down when you lift it
up with your fingers.
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
170 -180mm back from
the leading edge of the wing, measured at the
fuselage.
2) 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
sides under the horizontal stabilizer. If the t ail
of the plane falls, the plane is tail heavy . To
BALANCING
3) When the elevator , rudder and aileron
control surfaces are centered, use a ruler and
check the amount of the control throw in each
surface. The control throws should be
measured at the widest point of each surface!
4) By moving the position of the adjustable control horn out from the control surface,
you will decrease the amount of throw of that
control surface. Moving the adjustable control horn toward the control surface will increase the amount of throw.
FLIGHT PREPARATION
A) Check the operation and direction of
the elevator, rudder, ailerons and throttle.
B) Plug in your radio system per the
manufacturer's instructions and turn everything on.
C) Check the elevator first. Pull back on
the elevator stick. The elevator halves should
move up. If it they do not, flip the servo reversing switch on your transmitter to change
the direction.
D) Check the rudder. Looking from behind the airplane, move the rudder stick to the
right. The rudder should move to the right. If it
does not, flip the servo reversing switch on
your transmitter to change the direction.
E) Check the throttle. Moving the throttle
stick forward should open the carburetor barrel. If it does not, flip the servo reversing switch
on your transmitter to change the direction.
F) From behind the airplane, look at the
aileron on the right wing half. Move the aileron
stick to the right. The right aileron should move
up and the other aileron should move down. If
it does not, flip the servo reversing switch on
your transmitter to change the direction.
Ailerons low rate - 5/8” up/down
Ailerons medium rate - 1” up/down
Ailerons high rate - 2 1/2” up/down
Elevator low rate - 9/16” up/down
Elevator medium rate - 1 3/4” up/down
Elevator high rate - 2 3/4” up/down
Rudder low rate - 1 3/4” right/left
Rudder medium rate - 3” right/left
Rudder high rate - 5 1/2” right/left
Recomended Control Throws
Do not use the Aerobatic 3/D settings for
initial test flying.
HARRIER 3D Instruction Manual
22
5) If your radio transmitter is equipped
with dual rate switches double check that they
are on the low rate setting for your first few
flights.
PREFLIGHT CHECK
1) Completely charge your transmitter
and receiver batteries before your first day of
flying.
2) Check every bolt and every glue joint
in the Harrier 3D to ensure that everything is
tight and well bonded.
3) Double check the balance of the airplane. Do this with the fuel tank empty.
4) Check the control surfaces. All should
move in the correct direction and not bind in
any way .
6) Check to ensure the control surfaces
are moving the proper amount for both low
and high rate settings.
8) Properly balance the propeller. An out
of balance propeller will cause excessive vibration which could lead to engine and/or airframe failure.
We wish you many safe and enjoyable
flights with your Harrier 3D.
7) Check the receiver antenna. It should
be fully extended and not coiled up inside the
fuselage.
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