“Graphics and specifications may change without notice”.
MS:159
ASSEMBLY MANUAL
Specifications:
Wing span ----------------------------61.8in (157cm).
Wing area -----------------1100.5sq.in (71.0sq dm).
Weight ----------------------- 6.6-7.5lbs (3.0-3.4kg).
Length ---------------------------------59.1in (150cm).
Engine --------------- 0.61-0.95cu.in ----2-stroke.
Radio --------------------6 channels with 6 servos.
Electric conversion :optional
ULTRA JET Instruction Manual.
2
INTRODUCTION.
Thank you for choosing the ULTRA JET ARTF by SEAGULL MODELS COMPANY LTD. The
ULTRA JET was designed with the intermediate/advanced sport flyer in mind. It is a not semi scale
airplane which is easy to fly and quick to assemble. The airframe is conventionally built using balsa,
plywood 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 not fitted
and the hinges are pre-installed. Flying the ULTRA JET 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 ULTRA JET . Use the parts listing below to
identify all parts.
WARNING.
Please be aware that this aeroplane is not a toy and if it is assembled or used incorrectly it
will cause 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.
KIT CONTENTS
1
2
2
3
3
5
5
4
3
7
7
7
7
6
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ADDITIONAL ITEMS REQUIRED.
0.61-0.95 2-stroke.
Computer radio with 6 servos.
Glow plug to suit engine.
Pusher propeller to suit engine.
Protective foam rubber for radio
system.
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.
1 Fuselage
2 Wing Set
3 Vertical Fins
4 Canopy
5 Leading Edge Extension
6 Aluminum Wing Tube
7 Hardware bag included
KIT CONTENTS.
INSTALL ELEVON CONTROL HORN.
Elevon control horn.
Epoxy.
Epoxy .
Fiberglass control horn.
INSTALL LEADING EDGE
EXTENSION
ULTRA JET Instruction Manual.
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1) Attach the Leading Edge Extension to the
wing. Use a hobby knife to remove the covering
at the Leading Edge Extension and wing end.
2) Apply epoxy to the surface of the Wing and
Leading Edge Extension and hole them
together until the epoxy had set.
Remove covering.
Remove covering.
Fill epoxy.
Fill epoxy.
Fill epoxy.
Seal covering iron.
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1) Using a modeling knife, carefully cut
off 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.
INST ALLING THE STOPPER ASSEMBL Y .
Thread locker glue.
2) Using a modeling knife, cut one length
of silicon fuel line. Connect one end of the line
to the weighted fuel pick up and the other end
to the nylon pick up tube.
3) Carefully bend the second nylon tube
up at a 45º angle. This tube is the vent tube.
Vent tube.
Fuel pick up tube.
Fuel fill tube.
ENGINE MOUNT INST ALLATION.
1) Locate the items necessary to install the
engine mount included with your model.
2) Use four 4x30mm head bolts and four 4mm
washers to attach the engine mount rails to
the firewall. Tighten the screws . Make sure to
use threadlock on the screws to help prevent
them from vibrating loose.
4x30mm.
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1) Install the rubber grommets and brass
collets onto the throttle servo. T est fit the servo
into the throttle servo mount.
INSTALLING THE FUSELAGE SERVOS.
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.
8) Use plywood template to hold in place
the fuel tank with C/A glue to secure the fuel
tank inside the fuselage.
Vent tube.
Fuel pick up tube.
Fuel fill tube.
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.
M3x10mm.
FUEL TANK INSTALLATION.
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.
7) Slide the fuel tank into the fuselage. Guide
the lines from the tank through the hole in the
firewall.
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.
5) With the stopper assembly in place,
the weighted pick-up 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 3 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.
C/A glue.
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2) Secure the servos with the screws provided with your radio system.
THROTTLE SERVO ARM INSTALLATION.
Install adjustable servo connector in the servo
arm as same as picture below:
Throttle servo.
Retract servo.
Retract servo arm.
Trim and cut.
3/ 32” Hole.
INSTALLING THE SWITCH.
Install the switch into the precut hole in the
side, in the fuselage.
Steering servo.
Steering servo arm.
Adjustable Servo
Servo arm.
Loctite secure.
1
Diameter= 2mm.
2
Diameter= 3mm.
Throttle servo arm.
ULTRA JET Instruction Manual.
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M3x30mm
7) Slide the throttle pushrod wire into the tube.
Position the engine between the mounts. Use
four M3x30mm machine screws to secure the
engine to the mount as shown.
5) Slide the pushrod tube in the firewall and
guide it through the fuel tank mount. Use
medium C/A to glue the tube to the firewall and
the fuel tank mount.
6) Connect the Z-bend in the 450mm throttle
pushrod to the outer hole of the carburetor arm.
Pushrod tube hole.
3) Use a drill to drill the four holes in the engine
mount rails.
4) On the fire wall has drill a hole in the firewall
for the throttle pushrod the location for the
throttle pusshrod tube (pre-drill).
4.5mm.
4mm.
2) Use a pin drill and 4mm drill bit to drill a
small indentation in the mount for the engine
mounting screw.
MOUNTING THE ENGINE.
1) Position the engine with the drive washer
(130mm) forward of the firewall as shown.
130mm.
Switch.
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9) Move the throttle stick to the closed position
and move the carburetor to closed. Use a 1.5mm
hex wrench to tighten the screw that secures
the throttle pushrod wire. Make sure to use
threadlock on the screw so it does not vibrate
loose.
8) Reinstall the servo horn by sliding the
connector over the pushrod wire. Center the
throttle stick and trim and install the servo horn
perpendicular to the servo center line.
Pushrod wire
Screw.
ELECTRIC POWER CONVERSION.
1) Locate the items neccessary to install the
electric power conversion included with your
model.
2) Att ach the draw cross lines on the sub firewall
to locate the centred mounting position of your
electric motor box to the firewall suitable with
the cross lines drawn on the electric motor box
and firewall. Using epoxy and balsa stick to
secure the motor box to the firewall. Please see
pictures below.
- Model size: .61-75 size models
- Motor: 50mm 310 rev per volt
- Propeller: 13x10 ~ 14x10
- ESC: 60A
- Lipo Batteries: 8 cell 3200mA
Recommendation EP parts as shown (not
included with your model)
Ruler.
Pen.
ULTRA JET Instruction Manual.
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Electric motor.
M3x15mm.
4mm.
Blind nut.
3) Attach the motor to the front of the electric
motor box using four 3mm blind nut, four
M3x15mm hex head bolts to secure the motor.
Please see picture shown.
M4x60mm.
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Battery.
Speed control.
5) Attach the speed control to the side of the
motor box using two-sided tape and tie wraps.
Connect the appropriate leads from the speed
control to the motor. Make sure the leads will
not interfere with the operation of the motor.
4) Locate the plywood battery tray to the
fuselage. Tighten the screws using machine
screws M3x15mm to secure the tray in position.
INSTALLING THE SPINNER.
Install the spinner backplate, propeller and
spinner cone.
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.
INSTALLING NOSE RETRACTABLE
LANDING GEAR .
Locate the items ceccessary to install the
Retractable landing gear as shown.
M2x6mm.
1) Install Retractable landing gear..
ULTRA JET Instruction Manual.
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2mm Diameter Screw.
M3x15mm.
2) Install Pushrod.
M2 lock nut.
M2 clevis.
70mm.
Retract pushrod.
M3 lock nut.
M3 clevis.
1
1
Cable Steering.
2mm.
2mm.
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Axle.
Landing gear.
Axle.
Wheel collar.
Axle.
Wheel.
2
3) Install Wheel.
2.
Wheel collar.
Screw.
M2x10mm.
Screw.
INSTALLING THE AILERON
M3 clevis.
ULTRA JET Instruction Manual.
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3) Use drill bit in a pin vise to drill the mouting
holes in the blocks.
String.
Small weight.
1) Using a small weight (Weighted fuel pick-up
works well) and string, feed the string through
the wing as indicated.
2) Place the servo between the mounting
blocks and space it from the hatch. Use a pencil
to mark the mounting hole locations on the
blocks.
Servos.
Small weight.
Thread.
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.
4) Apply 2-3 drops of thin C/A to each of the
mounting holes. Allow the C/A to cure without
using accelerator.
6) Secure the servo to the aileron hatch using
Phillips screwdriver and the screws provided
with the servo.
5) Use dental floss to secure the connection
so they cannot become unplugged.
7) Apply 1-2 drops of thin C/A to each of the
mounting tabs. Allow the C/A to cure without
using accelerator.
8) A string has been provided in the wing to
pull the aileron lead through to the wing root.
Remove the string from the wing at the servo
location and use the tape to attach it to the
servo extension lead. Pull the lead through the
wing and remove the string.
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Small weight.
String.
ELEVON PUSHROD HORN INST ALLA TION.
M3 lock nut.
M3 clevis.
125mm.
155mm.
9) Set the elevon hatch in place and use a
Phillips screw driver to install it with four wood
screws.
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Epoxy.
INSTALLING RETRACTABLE
LANDING GEAR .
2mm Diameter Screw.
Elevon pushrod.
M3 lock nut.
M3x15mm.
Screw.
Wheel Fairing.
2mm.
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Epoxy.
Wheel Collar.
Screw.
Wheel .
Screw.
Wheel Collar.
Wheel .
RETRACTABLE LANDING GEAR
PUSHROD INSTALLATION
1) Locate items necessary to install landing
gear pushrod .
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ATTACHMENT TAIL - WING.
M3 lock nut.
M3 clevis.
30mm.
50mm.
M3x20mm.
Pushrod .
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2) Apply the epoxy to the surface of both tail
and wing end. The tail is held in position and
install it to the wing end. Please see pictures
shown.
Remove covering.
Remove covering.
Fill epoxy .
Fill epoxy .
Fill epoxy .
1) Attach the tail to the wing. Use a hobby knife
to remove the covering at the tail and wing end.
3) With the tail held firmly in place, use a
pen and draw lines onto the tail where it and
the wing sides meet. Do this on both the right
and left sides and top and bottom of the tail.
4) Remove the tail and wing. Using the
lines you just drew as a guide, carefully remove the covering from between them using
a modeling knife.
Pen.
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2
120mm.
5) Apply the epoxy to the surface of both tail
and wing end. The tail is held in position and
install it to the wing end. Please see pictures
shown.
Fill epoxy .
Fill epoxy.
INSTALLATION PILOT AND CANOPY.
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1
1) Locate items necessary to install pilot, and
canopy.
2) A scale pilot is included with this ARF. The
Seagull Pilot included fitting well to the cockpit.
(or you can order others scale pilot figures
made by Seagull factory. They are available at
Seagull distributors.)
3) Position the pilot figure on the canopy floor
as show. Locate the oval shaped on the canopy
floor and remove the covering. Use epoxy to
glue this into the base of the pilot figure and
glue the cockpit panel in place with C/A glue,
please see pictures as shown.
If you are going to install a pilot figure, please
use a sanding bar to sand the base of the figure
so that it is flat.
Fill epoxy.
When cutting through the covering to re-
move it, cut with only enough pressure
to only cut through the covering itself. Cutting
into the balsa structure may weaken it.
Remove covering.
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Insert two wing panels as pictures below.
Wing bolt.
2
C/A glue.
INSTALLING RECEIVER AND BATTERY.
Receiver.
1) Plug the five servo leads and the switch
lead into the receiver. Plug the battery pack
lead into the switch also.
3) Route the antenna in the antenna tube
inside the fuselage and secure it to the bottom of fuselage using a plastic tape.
2) Wrap the receiver and battery pack in
the protective foam rubber to protect them
from vibration.
Battery.
ATTACHMENT WING-FUSELAGE.
Wing tube.
Attach the aluminium tube into fuselage.
C/A glue.
M2x6mm.
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 GRA VITY IS LOCATED
250 MM BACK FROM THE LEADING EDGE
OF THE WING AT THE WING ROOT.
ULTRA JET Instruction Manual.
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*If possible, first attempt to balance the model
by changing the position of the receiver battery
and receiver. If you are unable to obt ain good
balance by doing so, then it will be necessary
to add weight to the nose or tail to achieve the
proper balance point.
With the wing attached to the fuselage, all
parts of the model installed ( ready to fly), and
empty fuel tanks, hold the model at the marked
balance point with the stabilizer level.
Lift the model. If the tail drops when you lift,
the model is “tail heavy” and you must add
weight* to the nose. If the nose drops, it is
“nose heavy” and you must add weight* to the
tail to balance.
CONTROL THROWS.
Ailerons: 18mm - 18mm up.
18mm - 18mm down.
Accurately mark the balance point on the top
of the wing on both sides of the fuselage. The
balance point is located 250 mm back from
the leading edge of the wing at the wing root.
This is the balance point at which your model
should balance for your first flights. Later , you
may wish to experiment by shifting the balance
up to 10mm forward or back to change the
flying characteristics. Moving the balance
forward may improve the smoothness and
arrow- like tracking, but it may then require
more speed for take off and make it more
difficult to slow down for landing. Moving the
balance aft makes the model more agile with
a lighter and snappier ”feel”. In any case,please
start at the location we recommend .
2) Mount the wing to the fuselage. Using a
couple of pieces of masking tape, place them
on the top side of the wing
250mm back from
the leading edge of the wing at the wing root.
3) Turn the airplane upside down. Place
your fingers on the masking tape and carefully
lift the plane .
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7) Check the receiver antenna. It should
be fully extended and not coiled up inside the
fuselage.
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.
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.
4) Check the control surfaces. All should
move in the correct direction and not bind in
any way .
We wish you many safe and enjoyable
flights with your ULTRA JET.
D) 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.
E) From behind the airplane, look at
the elevon on the right wing half. Move the
aileron stick to the right. The right elevon
should move up and the other elevon should
move down. If it does not, flip the servo reversing switch on your transmitter to change
the direction.
C) Check the nose steering rudder.
Looking from behind the airplane, move the
rudder stick to the right. The nose wheel rudder should move to the right. If it does not, flip
the servo reversing switch on your transmitter to change the direction.
A) Plug in your radio system per the
manufacturer's instructions and turn everything on.
Check the operation and direction of the
elevator, rudder, ailerons and throttle.
FLIGHT PREPARATION.
3) Double check the balance of the airplane. Do this with the fuel tank empty.
2) Check every bolt and every glue joint
in the ULTRA JET to ensure that
everything is tight and well bonded.
1) Completely charge your transmitter
and receiver batteries before your first day of
flying.
PREFLIGHT CHECK.
B) Check the elevator first. Pull back
on the elevator stick. The elevon halves
should move up. If it they do not, flip the servo
reversing switch on your transmitter to change
the direction.
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