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MS 74
Assembly Manual
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Piper MS 74 Assembly Manual

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Page 1
Made in Vietnam.
“Graphics and specfications may change without notice”.
Kit features.
• Ready-made—minimal assembly & finishing required.
• Ready-covered covering.
• Photo-illustrated step-by-step Assembly Manual.
Specifications
Approximate flying weight--------------------9.95- 11 lbs------------------4.5 - 5kg. Length--------------------------------------------- 56.2in-------------------------- 142.7cm. Recommended engine size---------------- .1.2-1.5 cu.in----------------- 4-stroke. .91 - 1.2 cu.in----------------2-troske.
Radio System required 4 channels with 6 servos Flying skill level Intermediate/advanced.
ASSEMBLY MANUAL
MS: 74
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PIPER CUB_ CODE SEA 74. Instruction Manual
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INTRODUCTION.
Thank you for choosing the PIPER CUB ARTF by SEAGULL MODELS. The PIPER CUB was designed with the intermediate/advanced sport scale in mind. It is a 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 has been fitted and the hinges are pre-installed . Flying the PIPER CUB 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 PIPER CUB. 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.
.1.2-1.5 4-stroke engine .91 - 1.2 cu.in 2-stroke
6 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
WING ASSEMBLY
(1) Right wing (1) Left wing (1) Aluminium dihedral brace
Tail section assembly
(1) Horizontal stabilizer/ elevator
halves.
(1) Rudder halves.
Some more parts.
HARDWARE PACK
COWLING
Landing gear.....
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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 wing panel until the T-pin is snug against the wing panel. This will help ensure an equal amount of hinge is on either side of the hinge line when the aileron is mounted to the aileron.
3) Slide the wing panel on the aileron 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.
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.
Note:
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 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.
To avoid scratching your new aero­plane 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 PIPER CUB 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.
NOTE:
HINGING THE AILERONS.
Hinge.
T- pin.
Hinge.
T- pin.
C/A glue.
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PIPER CUB_ CODE SEA 74. Instruction Manual
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HINGING THE ELEVATOR.
8) Af ter 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.
7) Repeat this process with the other wing panel, securely hinging the aileron in place.
HINGING THE RUDDER.
Glue the elevator hinges in place using the same tectniques used to hinge the ailerons.
Glue the rudder hinges in place using the same tectniques used to hinge the ailerons.
TURNBUCKLE INSTALLATION.
Installing the turnbuckle for the wing as same as pictures below.
Work the aileron up and down several times to “work in” the hinges and check for proper movement.
Note:
5) Turn the wing p anel 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.
The hole location of turnbuckles shown in pic­ture below .
Washer.
washer.
Turnbuckle.
Turnbuckle.
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Aileron control horn: See pictures below.
AILERON CONTROL HORN
ELEVATOR CONTROL HORN.
M3 LOCK NUT.
ALUMINUM WASHER.
ALUMINUM WASHER.
CONTRONL HORN M3 SCREW.
16mm.
Epoxy.
Wing
Epoxy.
Wing
Hinge.
Install the elevator control horn using the same method as with the aileron control horns.
2 sets.
3x35mm.
2 sets.
3x40mm.
Aluminum Washer.
16mm.
CONTRONL HORN M3
M3 LOCK NUT.
Epoxy.
Epoxy.
Aluminum Washer.
Wing.
Aileron.
Horizontal Stabilizer
.
Horizontal Stabilizer .
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PIPER CUB_ CODE SEA 74. Instruction Manual
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16mm.
See pictures below.Make yourself the template of your engine on paper .
ENGINE MOUNT INST ALLATION.
Mark and drill 4 holes for engine mount. Insert 4 blind nuts to firewall.
4x30mm.
Thread locker glue.
Rudder control horn: Using the same tectniques used aileron control horn. See picture below.
2 sets.
3x35mm.
EPOXY .
Rudder control horn.
Rudder.
FUSELAGE.
RUDDER CONTROL HORN.
Elevator control horn.
CONTRONL HORN M3 SCREW
.
M3 LOCK NUT.
ALUMINUM WASHER.
EPOXY .
FUSELAGE.
ALUMINUM WASHER.
Rudder.
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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.(The silicon tube is not included).
3) Carefully bend the second nylon tube up at a 45º angle. This tube is the vent tube.
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.
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.
Important: When the stopper assembly is in- stalled 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.
Carefully use a lighter or heat gun to permenently set the angle of the vent tube.
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.
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.
Vent tube.
Fuel pick up tube.
Fuel fill tube.
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1) Assemble and mounting the wheel as shown in the following pictures.
2) Follow diagram below for wheel installation:
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 .
Fuel pick-up tube.
Fuel fill tube.
Vent tube.
Rubber band.
Fuel tank.
WHEEL INSTALLATION.
Landing gear.
Wheel.
Wheel collar.
Wheel collar.
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3) 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.
INSTALLING THE LANDING GEAR
1.5mm diameter.
1.5mm diametter.
3x10mm.
4) Remove the engine. Using an drill bit, drill the mounting holes through the engine mount at the four locations marked.
2) Place your engine onto the engine mount. Adjust the engine is centered of the edges of the engine case.
3) When you are satisfied with the align­ment, mark the locations of the engine mounting.
1) Install the pushrod housing through the
predrilled hole in the firewall and into the servo compartment. The pushrod housing should protrude 1/4" out past the front of the firewall. Make a Z-Bend 1/4" from one end of the plain wire pushrod.
MOUNTING THE ENGINE.
Wheel Fairing.
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COWLING INST ALLA TION.
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 then trim and cut.
6) Att ach the Z-Bend in the pushrod wire to
the throttle arm on the carburetor.
5) Bolt the engine to the engine mount using
the four machine screws. Double check that all the screws are tight before proceeding.
Machine Screw 4x30mm.
Trim and cut.
Trim and cut.
Trim and cut.
Trim and cut.
Machine Screw 4x30mm.
Pushrod wire.
4.2 mm diameter.
155mm .
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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.
3) Install the muffler and muffler extension onto the engine and make the cut out 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 3x10mm screws (4).
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.
Machine Screw 3x10mm.
1.5mm were (needle valve).
INSTALLING THE SWITCH.
Install the switch into the precut hole in the
side of fuselage.
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THROTTLE SERVO ARM INSTALLATION.
Remove covering.
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.
Draw center line.
2) Secure the servos with the screws pro­vided with your radio system.
1) Install the rubber grommets and brass collets onto the throttle servo. T est fit the servo into the aileron servo mount.
Throttle servo.
Elevator servo.
Elevator servo.
Rudder servo.
Throttle servo arm.
Elevator servo .
Elevator servo .
Rudder servo .
Install adjustable servo connector in the servo arm .
pen.
Epoxy
INSTALLING THE HORIZONTAL
STABILIZER.
INSTALLING THE FUSELAGE SERVO.
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
.
Switch.
Adjustable Servo connector.
Servo arm.
Loctite secure.
1 pcs.
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C/A glue.
Hinge.
Remove covering.
90º
Vertical
Stabilizer.
Horizontal
Stabilizer.
Hinge slot.
Pen.
Put the vertical stabilizer into the in the top of the horizontal fin. The bottom edge of the stabilizer should also be firmly pushed against the top of the horizontal stabilizer .
INSTALLING THE VERTICAL STABILIZER.
INSTALLING THE AILERON SERVOS.
String.
Small weight.
Servos.
Small weight.
Thread.
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.
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Attach the string to the servo lead and carefully thread it though the wing.
INST ALLA TION THE PUSHROD.
Wing.
Aileron.
String.
Small Weight.
Wing.
Wing rib.
String.
Small Weight.
Aileron.
Aileron.
Servo electric wire.
Aileron Servo.
M2 lock nut.
M2 clevis.
75mm.
110mm.
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ELEVATOR - RUDDER PUSHROD
INSTALLATION.
Repeat the procedure for the other wing.
Elevator control horn.
Rudder control horn.
Elevator and rudder pushrods assembly follow pictures below.
Attach to servo arm in fuselage.
Attach to elevator - rudder control horn.
Wing.
Aileron.
M2 lock nut.
Throttle.
Elevator.
Rudder.
M2 Lock nut.M2 clevis.
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Rudder pushrod.
Control horn.
Elevator Pushrod.
Metal clevis.
Elevator pushrod.
M2 lock nut.
Elevator.
Elevator.
Rudder.
Throttle.
INSTALLING TAIL STRUT SUPPORT
The tail strut system assembly follow pic-
tures below.
2
1
1
2
2
Vertical Fin.
Horizontal Fin.
3x15mm.
3x10mm.
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2
2
1
Vertical Fin.
Horizontal Fin.
2
2
1
1
2
Vertical Fin.
Horizontal Fin.
Fuselage bottom.
M3 x 10mm.
3x10mm.
Bottom.
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MOUNTING THE TAIL WHEEL.
See picture below.
3x25mm.
3 x10 mm.
3
3
4
4
1
1
2
2
3
3
4
4
4
3
4
4
M3 x 10mm.
3
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2) Wrap the receiver and battery pack in the protective foam rubber to protect them from vibration.
3) Route the antenna in the antenna tube
inside the fuselage and secure it to the bot­tom of fuselage using a plastic tape.
INSTALLING THE BATTERY-RECEIVER.
T ail landing gear .
Spring.
3x25 mm.
3x10 mm.
Aluminum tail Landing gear.
1) Plug the six servo leads and the switch lead into the receiver. Plug the battery pack lead into the switch also.
INSTALLATION PILOT.
ATTACHMENT WING-FUSELAGE.
Attach the aluminium tube into fuselage.
Antenna.
Battery.
Receiver.
120MM.
Epoxy.
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Wing bolt.
M3x50mm.
4.5-5mm diameter screw.
M3x50mm.
Plastic Screw.
Insert two wing panels as pictures below.
Wing tube.
3x50mm.
Aluminum tube.
C/A glue.
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M4x10mm.
Parts requirement.See pictures below.
INSTALLING THE WING STRUT.
Fuselage.
60mm.
85mm.
M4x10mm.
1
2
3
Turnbuckle.
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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!
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.
1) It is critical that your airplane be bal­anced correctly . Improper balance will cause your plane to lose control and crash. The cen-
ter of gravity is locate
9.5cm back from the
leading edge of the wing, measured at wing tip.
BALANCING.
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 tail of the plane falls, the plane is tail heavy .
T o correct this, move the battery and receiver forward orif this is not possible, stick weight onto 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 the PIPER CUB 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).
9.5cm.
CONTROL THROWS.
M4x25mm.
1
Plastic Screw.
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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 PIPER CUB 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.
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.
INITIAL FLYING
AEROBA TIC FL YING
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.
We wish you many safe and enjoyable flights with your PIPER CUB .
7) Check the receiver antenna. It should be fully extended and not coiled up inside the fuselage.
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