CESSNA 337 SKYMASTER Instruction Manual. 2 INTRODUCTION. Thank you for choosing the CESSNA 337 SKYMASTER ARTF by SEAGULL MODELS COMPANY LTD. The CESSNA 337 SKYMASTER was designed

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www.seagullmodels.com

Specifications:Wing span -------------------------76.8in (195.0cm)Wing area --------------806.0sq.in (52.0sq dm)Weight -----------------------------9.9-11.0lbs(4.5-5.0kg)Length ---------------------------57.1in (145.0cm)Engine -------------0.36 - 0.46 cu.in -----2-stroke. 0.52 - 0.72cu.in -----4-stroke.Radio ----------------- 6 channels with 10 servos.Electric conversion :optional..

ASSEMBLY MANUAL MS:146

“Graphics and specifications may change without notice”.

“Cessna, 337 Skymaster, emblems, logos, and body designsare trademarks of Textron Innovations Inc. and are usedunder license by Seagull Models Manufacturing and TradingCompany LTD.”

68-6412-32462

CESSNA 337 SKYMASTER Instruction Manual.

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INTRODUCTION.

Thank you for choosing the CESSNA 337 SKYMASTER ARTF by SEAGULL MODELS COMPANYLTD. The CESSNA 337 SKYMASTER was designed with the intermediate/advanced sport flyer inmind. It is a semi scale airplane which is easy to fly and quick to assemble. The airframe isconventionally built using balsa, plywood to make it stronger than the average ARTF , yet the designallows the aeroplane to be kept light. You will find that most of the work has been done for youalready.The motor mount has been fitted and the hinges are pre-installed . Flying the CESSNA 337SKYMASTER is simply a joy.

This instruction manual is designed to help you build a great flying aeroplane. Please read thismanual thoroughly before starting assembly of your CESSNA 337 SKYMASTER . Use the partslisting below to identify all parts.

WARNING.

Please be aware that this aeroplane is not a toy and if assembled or used incorrectly it iscapable of causing injury to people or property. WHEN YOU FLY THIS AEROPLANE YOUASSUME ALL RISK & RESPONSIBILITY.If you are inexperienced with basic R/C flight we strongly recommend you contact your R/C supplierand join your local R/C Model Flying Club. R/C Model Flying Clubs offer a variety of trainingprocedures designed to help the new pilot on his way to successful R/C flight. They will also be ableto advise on any insurance and safety regulations that may apply.

KIT CONTENTS

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22

33

3

44

5

2A

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KIT CONTENTS.

ADDITIONAL ITEMS REQUIRED.

0.36-0.46 2-stroke engine0.52 -0.72 4-stroke engine6 channel with 10 servosGlow plug to suit enginePush pull propeller to suit engineProtective foam rubber for radiosystemSilicone fuel line

TOOLS & SUPPLIES NEEDED.

Thick cyanoacrylate glue30 minute epoxy5 minute epoxyHand or electric drillAssorted drill bitsModelling knifeStraight edge ruler2mm ball driverPhillips head screwdriver220 grit sandpaper90° square or builder’s triangleWire cuttersMasking tape & T-pinsThread-lockPaper towels

HINGING THE FLAP .

The control surfaces, including theailerons, elevators, and rudder, areprehinged with hinges installed, butthe hinges are not glued in place. Itis imperative that you properlyadhere the hinges in place per thesteps that follow using a high-qualitythin C/A glue.

Note:

1) Carefully remove the flap from one ofthe wing panels. Note the position of the hinges.

Hinge.

T-pin.

2) Remove each hinge from the wing paneland flap and place a T-pin in the center of eachhinge. Slide each hinge into the aileron untilthe T-pin is snug against the aileron. This willhelp ensure an equal amount of hinge is oneither side of the hinge line when the flap ismounted to the wing panel.

3) Slide the flap on the wing panel untilthere is only a slight gap. The hinge is nowcentered on the wing panel and flap. Removethe T-pins and snug the flap against the wingpanel. A gap of 1/64” or less should bemaintained between the wing panel and flap.

1 Fuselage2 Wing Set2A Center Wing3 Tail Set4 Cowlings5 Aluminum Wing Tube


4

The control surfaces, including theailerons, elevators, and rudder, areprehinged with hinges installed, butthe hinges are not glued in place. Itis imperative that you properlyadhere the hinges in place per thesteps that follow using a high-qualitythin C/A glue.

HINGING THE AILERONS .

Note:

1) Carefully remove the aileron from oneof the wing panels. Note the position of thehinges.

2) Remove each hinge from the wing paneland aileron and place a T-pin in the center ofeach hinge. Slide each hinge into the aileronuntil the T-pin is snug against the aileron. Thiswill help ensure an equal amount of hinge ison either side of the hinge line when the aileronis mounted to the wing panel.

Hinge.

4)Deflect the flap and completely saturateeach hinge with thin C/A glue. The ailerons frontsurface should lightly contact the wing duringthis procedure. Ideally, when the

The hinge is constructed of a specialmaterial that allows the C/A to wickor penetrate and distributethroughout the hinge, securelybonding it to the wood structure ofthe wing panel and flap.

hinges are glued in place, a 1/64” gap or lesswill be maintained throughout the lengh of theflap to the wing panel hinge line.

Note:

8) After both flap are securely hinged, firmlygrasp the wing panel and flap to make surethe hinges are securely glued and cannot bepulled out. Do this by carefully applyingmedium pressure, trying to separate the flapfrom the wing panel. Use caution not to crushthe wing structure.

7) Repeat this process with the other wingpanel, securely hinging the flap in place.

6) Using C/A remover/debonder and apaper towel, remove any excess C/A glue thatmay have accumulated on the wing or in theflap hinge area.

5) Turn the wing panel over and deflect theflap in the opposite direction from the oppositeside. Apply thin C/A glue to each hinge, makingsure that the C/A penetrates into both the flapand wing panel.

Work the flap down several times to“work in” the hinges and check forproper movement.

Note:

C/A glue.

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4)Deflect the aileron and completelysaturate each hinge with thin C/A glue. Theailerons front surface should lightly contact thewing during this procedure. Ideally, when the

The hinge is constructed of a specialmaterial that allows the C/A to wickor penetrate and distributethroughout the hinge, securelybonding it to the wood structure ofthe wing panel and aileron.

hinges are glued in place, a 1/64” gap or lesswill be maintained throughout the lengh of theaileron to the wing panel hinge line.

Note:

3) Slide the aileron on the wing panel untilthere is only a slight gap. The hinge is nowcentered on the wing panel and aileron.Remove the T-pins and snug the aileronagainst the wing panel. A gap of 1/64” or lessshould be maintained between the wing paneland aileron.

Hinge.

T-pin.

Hinge.

7) Repeat this process with the other wingpanel, securely hinging the aileron in place.

6) Using C/A remover/debonder and apaper towel, remove any excess C/A glue thatmay have accumulated on the wing or in theaileron hinge area.

5) Turn the wing panel over and deflect theaileron in the opposite direction from theopposite side. Apply thin C/A glue to eachhinge, making sure that the C/A penetrates intoboth the aileron and wing panel.


6

INSTALL THE AILERONS CONTROLHORN.

1) Locate the hardware necessary to installthe control horns for the ailerons.

Work the aileron up and down severaltimes to “work in” the hinges andcheck for proper movement.

Note:

HINGING THE ELEVATORS.

Glue the elevator hinges in place using thesame techniques used to hinge the ailerons.

HINGING THE RUDDER.

Glue the rudder hinges in place using thesame techniques used to hinge the ailerons.

Hinge.

8) After both ailerons are securely hinged,firmly grasp the wing panel and aileron tomake sure the hinges are securely glued andcannot be pulled out. Do this by carefullyapplying medium pressure, trying to separatethe aileron from the wing panel. Use cautionnot to crush the wing structure.

Aileron control horn .

Epoxy .

Epoxy .

Fiberglass control horn .

Epoxy .

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Install the flap control horn using the samemethod as same as the aileron control horns.

INSTALL FLAP CONTROL HORN.

Epoxy

Epoxy .

Flap control horn .

Install the elevator control horn using thesame method as same as the aileron controlhorns.

INSTALL ELEVATOR CONTROL HORN.

Epoxy

Epoxy

Elevator control horn

Repeat steps to install the rudder control hornas same as steps done for ailerons.

INSTALL RUDDER CONTROL HORN.

Fiberglass control horn .Fiberglass control horn .

Fiberglass control horn .


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2) Use four 4x30mm head bolts and four 4mmwashers to attach the engine mount rails tothe firewall. Tighten the screws . Make sure touse threadlock on the screws to help preventthem from vibrating loose.

1) Using a modeling knife, carefully cutoff the rear portion of one of the 3 nylon tubesleaving 1/2” protruding from the rear of thestopper. This will be the fuel pick up tube.

INSTALLING THE STOPPER ASSEMBLY .

2) Using a modeling knife, cut one lengthof silicon fuel line. Connect one end of the lineto the weighted fuel pick up and the other endto the nylon pick up tube.

3) Carefully bend the second nylon tubeup at a 45º angle. This tube is the vent tube.

Epoxy.

Rudder control horn.

1) Locate the items necessary to install theengine mount included with your model. .

ENGINE MOUNT INSTALLATION.

Epoxy.

4x30=mm.

Balsa.

Rubber band.

A.

B

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4) Test fit the stopper assembly into thetank. It may be necessary to remove some ofthe flashing around the tank opening using amodeling knife. If flashing is present, makesure none falls into the tank.

Vent tube. Fuel pick up tube.

Fuel fill tube.

5) With the stopper assembly in place,the weighted pick-up should rest away fromthe rear of the tank and move freely inside thetank. The top of the vent tube should rest justbelow the top of the tank. It should not touchthe top of the tank.

6) When satisfied with the alignment ofthe stopper assembly tighten the 3 x 20mmmachine screw until the rubber stopper ex-pands and seals the tank opening. Do notovertighten the assembly as this could causethe tank to split.

Fuel tank.

8) Use plywood template to hold in place thefuel tank with C/A glue to secure the fuel tankinside the fuselage.

9) Use balsa stick to help prevent moveablefrom transferring to the fuel tank.

FUEL TANK INSTALLATION BEFORE.

You should mark which tube is the ventand which is the fuel pickup when you attachfuel tubing to the tubes in the stopper. Oncethe tank is installed inside the fuselage, it maybe difficult to determine which is which.

7) Slide the fuel tank into the fuselage.Guide the lines from the tank through the holein the firewall.

Fuel tank.

Epoxy

A.

B


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vent tube.

Fuel pick-up tube.

Fuel fill tube.

10) Connect the lines from the tank to theengine and muffler. The vent line will connectto the muffler and the line from the clunk to thecarburetor.

Fuel tank.

8) Use plywood template to hold in place thefuel tank with C/A glue to secure the fuel tankinside the fuselage.

9) Use balsa stick to help prevent moveablefrom transferring to the fuel tank.

FUEL TANK INSTALLATION AFTER.

You should mark which tube is the ventand which is the fuel pickup when you attachfuel tubing to the tubes in the stopper. Oncethe tank is installed inside the fuselage, it maybe difficult to determine which is which.

7) Slide the fuel tank into the fuselage.Guide the lines from the tank through the holein the firewall.

Fuel tank.

Epoxy

Rubber band.

Blow through one of the lines to en-sure the fuel lines have not become kinkedinside the fuel tank compartment. Airshould flow through easily.

vent tube.

Fuel pick-up tube.

Fuel fill tube.

10) Connect the lines from the tank to theengine and muffler. The vent line will connectto the muffler and the line from the clunk to thecarburetor.

balsa wood included.

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Throttle servo.

Blow through one of the lines to en-sure the fuel lines have not become kinkedinside the fuel tank compartment. Airshould flow through easily.

INSTALLING THE FUSELAGE SERVOS.

1) Install the rubber grommets and brasscollets onto the throttle servo. Test fit the servointo the aileron servo mount.

2) Secure the servos with the screws pro-vided with your radio system.

Because the size of servos differ, youmay need to adjust the size of the precut open-ing in the mount. The notch in the sides of themount allow the servo lead to pass through.

Elevator servo.

Rudder servo.

Rudder servo.

THROTTLE SERVO ARM INSTALLATION.

Install adjustable servo connector in the servoarm as same as picture below:

Adjustable Servoconnector.

Servo arm.

Loctite secure.

Nut.Landing gear servo.


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2) Use a pin drill and 2mm drill bit to drill asmall indentation in the mount for the enginemounting screw.

105mm.

MOUNTING THE ENGINE BEFORE.

1) Position the engine with the drive washer(110mm) forward of the firewall as shown.

Trim and cut.

Switch.

rudder servo arm.

Rudder servo arm.

Elevator servo arm.

INSTALLING THE SWITCH.

3/ 32” Hole.

Install the switch into the precut hole in theside, in the fuselage.

Throttle servo arm.

Landing gear servo arm.

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Linkage..

5) Slide the pushrod tube in the firewall andguide it through the fuel tank mount. Usemedium C/A to glue the tube to the firewalland the fuel tank mount.6) Connect the Z-bend in the 450mm throttlepushrod to the outer hole of the carburetorarm.

Pushrod tube hole.

3) Use a drill to drill the four holes in the enginemount rails.

4) On the fire wall has the location for thethrottle pusshrod tube (pre-drill).

M3x15mm.

2mm

Pushrod wire.

Machine screw M3x15mm.

Trim and cut.

7) Slide the throttle pushrod wire into thetube. Position the engine between themounts. Use four 3x15mm machine screws tosecure the engine to the mount as shown.

9) Move the throttle stick to the closed positionand move the carburetor to closed. Use a 2.5mmhex wrench to tighten the screw that securesthe throttle pushrod wire. Make sure to usethreadlock on the screw so it does not vibrateloose.


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2) Use a pin drill and 2mm drill bit to drill asmall indentation in the mount for the enginemounting screw.

105mm.

MOUNTING THE ENGINE AFTER.

1) Position the engine with the drive washer(110mm) forward of the firewall as shown.

2mm

5) Slide the pushrod tube in the firewall andguide it through the fuel tank mount. Usemedium C/A to glue the tube to the firewalland the fuel tank mount.6) Connect the Z-bend in the 450mm throttlepushrod to the outer hole of the carburetorarm.

Pushrod tube hole.

3) Use a drill to drill the four holes in the enginemount rails.

4) On the fire wall has the location for thethrottle pusshrod tube (pre-drill).

2mm diameter.


7) Slide the throttle pushrod wire into thetube. Position the engine between themounts. Use four 3x15mm machine screws tosecure the engine to the mount as shown.

Pushrod wire.

Screw.

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Linkage..

9) Move the throttle stick to the closed positionand move the carburetor to closed. Use a 2.5mmhex wrench to tighten the screw that securesthe throttle pushrod wire. Make sure to usethreadlock on the screw so it does not vibrateloose.

LANDING GEAR INSTALLATION:A. NOSE GEAR:1) Locate the items necessary to attach thenose landing gear that are included with yourmodel.

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1

2

4

5

41

2

23

Screw.


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Adjustable connector.

M2 clevis.

Screw..

2) Install landing gear at the top Fuselage.

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32

5

17


5mm.

2) Install LED lights at the top Cowling.

1) Slide the fiberglass cowl over the en-gine and line up the back edge of the cowl withthe marks you made on the fuselage then trimand cut as shown.

COWLING BEFORE.

Trim and cut.

Trim and cut.

Trim and cut.

C/A glue.

Drill a hole 5mm.


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4) Install the muffler and muffler extensiononto the engine and make the cutout in thecowl for muffler clearance. Connect the fueland pressure lines to the carburetor, mufflerand fuel filler valve. Secure the cowl to fuse-lage using the 3x10mm screws.


3) While keeping the back edge of thecowl flush with the marks, align the front ofthe cowl with the crankshaft of the engine. Thefront of the cowl should be positioned so thecrankshaft is in nearly the middle of the cowlopening. Use the spinner backplate as a guide.Hold the cowl firmly in place using pieces ofmasking tape.

Needle valve.

Because of the size of the cowl, it may be nec-essary to use a needle valve extension for thehigh speed needle valve. Make this out of suf-ficient length 1.5mm wire and install it into theend of the needle valve. Secure the wire inplace by tightening the set screw in the side ofthe needle valve.

1) Slide the fiberglass cowl over the en-gine and line up the back edge of the cowl withthe marks you made on the fuselage then trimand cut as shown.

COWLING AFTER.

Trim and cut.

Trim and cut.

Trim and cut.

Because of the size of the cowl, it may be nec-essary to use a needle valve extension for thehigh speed needle valve. Make this out of suf-ficient length 1.5mm wire and install it into theend of the needle valve. Secure the wire inplace by tightening the set screw in the side ofthe needle valve.

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3) While keeping the back edge of thecowl flush with the marks, align the front ofthe cowl with the crankshaft of the engine. Thefront of the cowl should be positioned so thecrankshaft is in nearly the middle of the cowlopening. Use the spinner backplate as a guide.Hold the cowl firmly in place using pieces ofmasking tape.

4) Install the muffler and muffler extensiononto the engine and make the cutout in thecowl for muffler clearance. Connect the fueland pressure lines to the carburetor, mufflerand fuel filler valve. Secure the cowl to fuse-lage using the 3x10mm screws.


Needle valve.

ELECTRIC POWER CONVERSION

Recommendation EP parts as shown (notincluded with your model)

- Model size: .35-.45 size models- Motor: 35mm 830 rev per volt- Propeller: 10x7- ESC: 50A- Lipo Batteries: 4 cell 3200mA

4mm.

BEFORE.

These parts included to your model


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4mm

M4x60mm.

M4x60mm.

Blind nut.

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Speed control.

ELECTRIC POWER CONVERSION

Recommendation EP parts as shown (notincluded with your model)

- Model size: .35-.45 size models- Motor: 35mm 830 rev per volt- Propeller: 10x7- ESC: 50A- Lipo Batteries: 4 cell 3200mA

M3x15mm.

4mm.

4mm.

AFTER.

These parts included to your model


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Battery.

M4x60mm.

M3x15mm.

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The propeller should not touch any partof the spinner cone. If it does, use a

sharp modeling knife and carefully trim awaythe spinner cone where the propeller comesin contact with it.

INSTALLING THE SPINNER BEFORE.

Install the spinner backplate, propeller andspinner cone.

INSTALLING THE SPINNER AFTER.

Install the spinner backplate, propeller andspinner cone.

The propeller should not touch any partof the spinner cone. If it does, use a

sharp modeling knife and carefully trim awaythe spinner cone where the propeller comesin contact with it.

Speed control.

INSTALLING THE AILERON.


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4) Apply 2-3 drops of thin C/A to each of themounting holes. Allow the C/A to cure withoutusing accelerator.

6) Secure the servo to the aileron hatch usingPhillips screwdriver and the screws providedwith the servo.

5) Use dental floss to secure the connectionso they cannot become unplugged.

7) Apply 1-2 drops of thin C/A to each of themounting tabs. Allow the C/A to cure withoutusing accelerator.

8) A string has been provided in the wing topull the aileron lead through to the wing root.Remove the string from the wing at the servolocation and use the tape to attach it to theservo extension lead. Pull the lead through thewing and remove the string.

3) Use drill bit in a pin vise to drill the moutingholes in the blocks.

String.Small weight.

1) Using a small weight (Weighted fuel pick-upworks well) and string, feed the string throughthe wing as indicated.

2) Place the servo between the mountingblocks and space it from the hatch. Use a pencilto mark the mounting hole locations on theblocks.

Servos. Small weight.

Thread.

Because the size of servos differ, youmay need to adjust the size of the precut open-ing in the mount. The notch in the sides ofthe mount allow the servo lead to pass through.

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Small weight.

9) Set the aileron hatch in place and use aPhillips screw driver to install it with four woodscrews.

Small weight.

String.

Electric wire.

AILERON PUSHROD HORN INSTALLATION

M2 lock nut.M2 clevis.

40mm.

70mm.

Wing.

Aleron.

M2 lock.


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Repeat the procedure for theaileron servo.

FLAG PUSHROD HORN INSTALLATION

Wing.

Flag.

M2 lock.

WHEEL AND WHEEL PANTS.

1) Assemble and mounting the landinggear ,wheels to the wheel pants as shown inthe following pictures.

2) Follow diagram below for wheel pantinstallation:

2

1

3

5

4

6

64

2

3

5

1

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3) A drop of C/A glue on the wheel collarscrews will help keep them from coming loseduring operation.

Repeat the process for the other wheel.

M4x20mm.

1) The blind nuts for securing the landinggear are already mounted inside the fuselage.

2) Using the hardware provided, mount themain landing gear to the fuselage.

INSTALLING THE MAIN LANDING GEAR.

INSTALLING THE VERTICAL STABILIZER.

1) Using a modeling knife, remove thecovering from over the precut hinge slot cutinto the lower rear portion of the tail at the fu-selage.

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Epoxy.

Remove covering.


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3) Slide the vertical stabilizer back inplace. Using a triangle, check to ensure thatthe vertical stabilizer is aligned 90º to the hori-zontal stabilizer.

2) While holding the vertical stabilizerfirmly in place, use a pen and draw a line oneach side of the vertical stabilizer where itmeets the top of the fuselage.

4) When you are sure that everything isaligned correctly, mix up a generous amount ofFlash 30 Minute Epoxy. Apply a thin layer to themounting slot and to bottom of the vertical sta-bilizer mounting area. Apply epoxy to the bot-tom and top edges of the filler block and to thelower hinge also. Set the stabilizer in placeand realign. Double check all of your measure-ments once more before the epoxy cures. Holdthe stabilizer in place with T-pins or maskingtape and remove any excess epoxy using apaper towel and rubbing alcohol. Allow the ep-oxy to fully cure before proceeding.Be verycareful not to get epoxy glue in the pushrodtubes.

2) Using a modeling knife, carefully removethe covering at mounting slot of horizontal sta-bilizer ( both side of fuselage).

Remove covering.

3) Put the stabilizer into place in the po-sition of the fuselage.

5) When you are satisfied with the align-ment, hold the stabilizer in place with T- pinsor masking tape, but do not glue at this time.

4) Install the stabilizer onto the fuselage.Align the centerline drawn on the top and therear of the stabilizer with the centre of the fu-selage. When that is aligned, hold the stabi-lizer in that position using T-pins or maskingtape. Align the horizontal stabilizer with thewing. When viewed from the rear, the hori-zontal stabilizer should be level with the wing.If it is not level, use sandpaper and sand downthe high side of the stabilizer mounting plat-form until the proper alignment is achieved.The tips of the stabilizer should also be equaldistance from the tips of the wing.

INSTALLING THE HORIZONTAL STABILIZER.

1) Using a ruler and a pen, locate thecenterline of the horizontal stabilizer, at the trail-ing edge, and place a mark. Use a triangleand extend this mark, from back to front,across the top of the stabilizer. Also extendthis mark down the back of the trailing edge ofthe stabilizer.

Epoxy.

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6) With the stabilizer held firmly in place,use a pen and draw lines onto the stabilizerwhere it and the fuselage sides meet. Do thison both the right and left sides and top andbottom of the stabilizer.

7) Remove the stabilizer. Using the linesyou just drew as a guide, carefully remove thecovering from between them using a model-ing knife.

Remove covering.

8) Using a modeling knife, carefully re-move the covering that overlaps the stabilizermounting platform sides in the fuselage. Re-move the covering from both the top and thebottom of the platform sides.

When cutting through the covering to re-move it, cut with only enough pressure

to only cut through the covering itself. Cuttinginto the balsa structure may weaken it.

9) When you are sure that everything isaligned correctly, mix up a generous amountof 30 Minute Epoxy. Apply a thin layer to thebottom of the stabilizer mounting area and tothe stabilizer mounting platform sides in thefuselage. Putting the stabilizer in place andrealign. Double check all of your measure-ments once more before the epoxy cures.Hold the stabilizer in place with T-pins or mask-ing tape and remove any excess epoxy usinga paper towel and rubbing alcohol.

Epoxy.

10) After the epoxy has fully cured, re-move the masking tape or T-pins used to holdthe stabilizer in place. Carefully inspect theglue joints. Use more epoxy to fill in any gapsthat may exist that were not filled previouslyand clean up the excess using a paper toweland rubbing alcohol.

Epoxy.

Epoxy.

C/A glue.


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Elevator control horn.

ELEVATOR PUSHROD HORNINSTALLATION.

1) Install the elevator control horn usingthe same method as with the aileron controlhorns. 2) Position the elevator control horn on

the both side of elevator.

C/A glue.

Control horn.M2 lock nut.

Metal clevis.Elevator pushrod.


690mm.

720mm.


RUDDER PUSHROD HORNINSTALLATION.


690mm.

720mm.


C/A glue.

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Cut.

Rudder Control horn.C/A glue.

C/A glue.

Rudder pushrod.

M2 lock nut.Metal clevis.

Rudder Control horn.

M2 lock nut.

Metal clevis.

Rudder pushrod. Control horn.

Rudder pushrod.


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Screw.

Rudder pushrod.

Elevator pushrod.

Cut.

Epoxy.

M2x6mm.

INSTALLATION THE STRUTS.

Wing.

Wing.

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Epoxy.

pen.

remove covering.

Fuselage.

Fuselage.

Fuselage.

Wing.

Fuselage.

INSTALLATION PILOT.

1) A scale pilot is included with this ARF. TheSeagull Pilot included fitting well to the cockpit.(or you can order others scale pilot figuresmade by Seagull factory. They are available atSeagull distributors.)

If you are going to install a pilot figure, pleaseuse a sanding bar to sand the base of the figureso that it is flat.

2) Position the pilot figure on the canopy flooras show. Locate the oval shaped on the canopyfloor and remove the covering. Use epoxy toglue this into the base of the pilot figure, pleasesee pictures as shown.

1

2


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Fuel tank

Battery.

INSTALLING THE BATTERY-RECEIVER.

1) Plug the five servo leads and the switchlead into the receiver. Plug the battery packlead into the switch also.

2) Wrap the receiver and battery pack inthe protective foam rubber to protect themfrom vibration.

3) Route the antenna in the antenna tubeinside the fuselage and secure it to the bot-tom of fuselage using a plastic tape.

APPLY THE DECALS.

1) If all the decals are precut and ready tostick. Please be certain the model is clean andfree from oily fingerprints and dust. Positiondecal on the model where desired, using thephotos on the box and aid in their location.

2) If all the decals are not precut, please usescissors or a sharp hobby knife to cut thedecals from the sheet. Please be certain themodel is clean and free from oily fingerprintsand dust. Position decal on the model wheredesired, using the photos on the box and aidin their location.

- Apply a bead of canopy glue around the insideedge of the canopy. Position the canopy ontothe hatch. Use tape to hold the canopy secureuntil the glue fully cures.

3) Position the canopy onto the fuselage. Tracearound the canopy and onto the fuselage usinga felt-tipped pen.

4) Install the canopy and secure it with M2x6mmscrews.

25mm

C/A glue.

1

2C/A glue.

Insert two wing panels as pictures below.

Wing tube.

Attach the aluminium tube into fuselage.

ATTACHMENT WING-FUSELAGE.

Battery lights.

M2x6mm.

35


Antenna.2.5mm.

M3x25mm.


36

BALANCING.

1) It is critical that your airplane bebalanced correctly. Improper balance willcause your plane to lose control and crash.THE CENTER OF GRAVITY IS LOCATED80 MM BACK FROM THE LEADING EDGEOF THE WING AT THE WING ROOT.

3) With the airplane upright, place yourfingers on the masking tape and carefully liftthe plane.

2) Mount the wing to the fuselage. Using acouple of pieces of masking tape, place themon the bottom side of the wing 80 mm backfrom the leading edge of the wing at the wingroot.

Accurately mark the balance point on the topof the wing on both sides of the fuselage. Thebalance point is located 80 mm back from theleading edge of the wing at the wing root. Thisis the balance point at which your modelshould balance for your first flights. Later, youmay wish to experiment by shifting the balanceup to 10mm forward or back to change theflying characteristics. Moving the balanceforward may improve the smoothness andarrow- like tracking, but it may then requiremore speed for take off and make it moredifficult to slow down for landing. Moving thebalance aft makes the model more agile witha lighter and snappier ”feel”. In any case,pleasestart at the location we recommend .

*If possible, first attempt to balance the modelby changing the position of the receiver batteryand receiver. If you are unable to obtain goodbalance by doing so, then it will be necessaryto add weight to the nose or tail to achieve theproper balance point.

With the wing attached to the fuselage, all partsof the model installed ( ready to fly), and emptyfuel tanks, hold the model at themarked balance point with the stabilizer level..

Lift the model. If the tail drops when you lift,the model is “tail heavy” and you must addweight* to the nose. If the nose drops, it is“nose heavy” and you must add weight* to thetail to balance.

M3x6mm.

M3x6mm.

INSTALLATION WING -FUSELAGETRUTS.

37


CONTROL THROWS.

Ailerons: 10mm - 12mm up. 10mm - 12mm down.

Elevator: 10mm - 12mm up. 10mm - 12mm down.

Rudder: 20mm - 25mm left. 20 mm - 25mm right.

80mm.


38

D) Check the throttle. Moving the throttlestick forward should open the carburetor bar-rel. If it does not, flip the servo reversing switchon your transmitter to change the direction.

E) From behind the airplane, look at theaileron on the right wing half. Move the aileronstick to the right. The right aileron should moveup and the other aileron should move down. Ifit does not, flip the servo reversing switch onyour transmitter to change the direction.

C) Check the rudder. Looking from be-hind the airplane, move the rudder stick to theright. The rudder should move to the right. If itdoes not, flip the servo reversing switch onyour transmitter to change the direction.

B) Check the elevator first. Pull back onthe elevator stick. The elevator halves shouldmove up. If it they do not, flip the servo re-versing switch on your transmitter to changethe direction.

Check the operation and direction of theelevator, rudder, ailerons and throttle.

FLIGHT PREPARATION.

A) Plug in your radio system per themanufacturer's instructions and turn every-thing on.

3) Double check the balance of the air-plane. Do this with the fuel tank empty.

2) Check every bolt and every glue jointin the CESSNA 337 SKYMASTER to ensurethat everything is tight and well bonded.

1) Completely charge your transmitterand receiver batteries before your first day offlying.

PREFLIGHT CHECK.

4) Check the control surfaces. All shouldmove in the correct direction and not bind inany way.

7) Check the receiver antenna. It shouldbe fully extended and not coiled up inside thefuselage.

5) If your radio transmitter is equippedwith dual rate switches double check that theyare on the low rate setting for your first fewflights.

6) Check to ensure the control surfacesare moving the proper amount for both lowand high rate settings.

8) Properly balance the propeller. An outof balance propeller will cause excessive vi-bration which could lead to engine and/or air-frame failure.

We wish you many safe and enjoyableflights with your CESSNA 337 SKYMASTER.

Documents

CESSNA 337 SKYMASTER Instruction Manual. 2 INTRODUCTION. Thank you for choosing the CESSNA 337 SKYMASTER ARTF by SEAGULL MODELS COMPANY LTD. The CESSNA 337 SKYMASTER was designed