SEAGULL 40SEAGULL 40 LOW WING TRAINER. Instruction Manual. 2 WING ASSEMBLY. NOTE: We highly recommend using 30 minute epoxy as it is stronger and provides more working time, allowing

SpecificationsWingspan ------------------------------------------ 60 in/ 153cm.Wing area ------------------------------------ 620 sq.in/ 40dm2.Length -------------------------------------------- 45 in/ 113.7cm.Approximate flying weight --------- 5.5 - 6.2 lbs/ 2.5-2.8kg.Recommended engine size - 0.40 -- 0.46 cu. in 2-stroke. 0.52 cu. in 4-stroke.Recommended R/C ------------------- 4 channel minimum.Flying skill level ----------------------------- Low wing Trainer.

Kit features.

• Ready-made-minimal assembly & finishing required.• Factory-installed pushrod.• Photo-illustrated step-by-step Assembly Manual.

Hand-made Almost Ready to Fly R/C Model Aircraft

ASSEMBLY MANUAL

Additional items required.Engine.4 Channel or greater Radio Control system.Glues.Tools.Starting Equipment.

Made in Vietnam.

SEAGULL 40LOW WING TRAINER

MS:10

“Graphics and specfications may change without notice”.

SEAGULL 40 LOW WING TRAINER. Instruction Manual.

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WING ASSEMBLY.

NOTE: We highly recommend using 30minute epoxy as it is stronger and providesmore working time, allowing the builder toproperly align the parts. Using fast cure epoxywhen joining the wing halves could result in theglue drying before the wing halves are alignedproperly which may result in failure of the wingcentre section during flight. 1) Test fit the Wing tube into each wing half.

The brace should slide in easily up to thecentreline that you drew. If not, use 220 gritsandpaper with a sanding block and sanddown the edges and ends of the brace until itfits properly.

NOTE: To avoid scratching your new aero-plane we suggest that you coveryour workbench with an old towel.Keep a couple of jars or bowls handyto hold the small parts after you openthe bags.Please trial fit all parts. Make sureyou have the correct parts and thatthey fit and are aligned properly be-fore gluing! This will ensure properassembly as the SEAGULL 40 ismade from natural materials andminor adjustments may have to bemade.The paint and plastic parts used inthis kit are fuel proof. However, theyare not tolerant of many harsh chemi-cals including the following: paintthinner, cyano-acrylate glue accel-erator, cyanoacrylate glue de-bonderand acetone. Do not let these chemi-cals come in contact with the colourson the covering and the plastic parts.

INTRODUCTION.

Thank you for choosing the SEAGULL 40 LOW WING TRAINER ARTF by SEAGULL MODELS. TheSEAGULL 40 was designed with the intermediate/advanced sport flyer in mind. It is a low-wingaeroplane 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 keptlight. You will find that most of the work has been done for you already. Flying the SEAGULL 40 issimply a joy.

This instruction manual is designed to help you build a great flying aeroplane. Please read thismanual thoroughly before starting assembly of your SEAGULL 40. Use the parts listing below toidentify all parts.

WARNING.

Please be aware that this aeroplane is not a toy and if assembled or used incorrectly itis capable 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/Csupplier and 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.

Wing tube.

www.seagullmodels.com

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3) Peel off the backing from the self adhe-sive covering strip. Apply the strip to the centresection of the wing starting from the bottomtrailing edge. Wrap the strip all the way aroundthe wing until it meets the trailing edge again.Trim off any excess strip.

Carefully slide the two wing halves togetherand firmly press them together, allowing theexcess epoxy to run out. There should not beany gap in the wing halves. Use rubbingalcohol and a paper tower to clean up anyexcess epoxy.

Apply masking tape at the wing join to holdthe wing halves together securely.

2) Remove the brace when satisfied withits fit ineach wing half. Coat both sides of onehalf of the dihedral brace with 30 minute epoxy.Next, pour some epoxy into the dihedral box inone wing panel. Make sure you cover the topand bottom as well as the sides of the dihedralbrace. Use enough epoxy to fill any gaps.

Glue attach.

Masking tape.

Remove covering.

Wing botton.

Epoxy.

INSTALLING THE AILERON SERVOS.

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.

1) Install the rubber grommets and brasscollets onto the aileron servo. Test fit theservo into the aileron servo mount.

2) Using a small weight (Weighted fuel pick-up works well) and thread, feed the stringthrough the wing as indicated.

Smallweight.

Servos.

Thread.


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4) Tape the servo lead to the wing to pre-vent it from falling back into the wing.

5) Reinstall the servo into the servo mountand secure the servo inplace using the woodscrews provided with you radio system.

Thread.

Thread.

Wing bottom. Small weight.

3) Attach servo lead to the aileron servo.Attach the string to the servo lead and care-fully thread it though the wing. Once you havethread the lead throught the wing, remove thestring so it can use for the other servo lead.

Thread.

Electric wire.

String.Small weight.

Plastic tape.


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2) Locate the two nylon control horns, twonylon control horn backplates and fourmachine screws.

1) Using a ruler & pen to draw a straightline as below picture.

2) Locate the two nylon control horns,two nylon control horn backplates and fourmachine screws.

3) Position the aileron horn on the bottomside of aileron. The clevis attachment holesshould be positioned over the hinge line.

(2) 2 x 20mm.

Control Horn.

Mounting Screws. Mounting Plate.

Repeat the procedure for the other winghalf.

Pen.

Straight line.

4) Using a 1mm drill bit and the controlhorns as a guide, drill the mounting holesthrough the aileron halves.

5) Mount the control horns by insertingthe screws through the control horn bases andaileron halves, then into the mountingbackplates. Do not overtighten the screws orthe backplates may crush the wood.

6) Thread one nylon adjustable controlhorn onto each aileron control rod. Thread thehorns on until they are flush with the ends ofthe control rods.

7) With the aileron servo centered andthe aileron even with the trailing edge of thewing attach the clevis to the control horn. Markthe control wire where it crosses the servoarm hole.

AILERON LINKAGE.

Pen.Mark point.


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3) The landing gear wire is held in placeusing two nylon landing gear straps and four3mm x 10mm wood screws.

The straps should be located equal dis-tance from the inside and outside ends

of the wire.

4) Using the two landing gear straps asa guide, mark the locations of the four 3 x10mm mounting screws onto the wing sur-face.

Gear mounting slot.

Landing gear wire.

8) Make a 90-degree bend at the markand cut off the excess wire leaving 10mm pastthe bend.

9) Connect the linkage as shown andsecure the control wire with a wire keeper.

Repeat the procedure for the otheraileron servo.

INSTALLING THE MAIN GEAR WIRES.

1) Using a modeling knife, remove thecovering from over the two main gear mount-ing slots located in the bottom of the wing.

2) Insert the 90º bend of one main gearwire into the predrilled hole in one mountingslot.

Cut.3x10mm.

7mm.


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FUEL TANK.

Be careful do not to drill through thetop of the wing!

6) Reinstall the gear wire and install thestraps using the four 3 x 10mm wood screws.Tighten the screws completely to secure thegear wire in place.

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

Pen.

Mark point.

5) Remove the two straps and the gearwire. Drill four 1.5mm pilot holes into the wingfor the wood screws.

1.5mm.

3 x 10mm.

Landing gear wire.

2) Using a modeling knife, cut one lengthof silicon fuel line (not included) to 2-1/4” long.Connect one end of the line to the weightedfuel pick up and the other end to the nylon pickup tube.

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

INSTALLING THE STOPPER ASSEMBLY.

4) Carefully heat the vent tube using aheat gun or lighter to permanently set theangle of the tube.

Vent tube. Fuel pick uptube.

Fuel fill tube.

When the stopper assembly is installed inthe tank, the top of the vent tube should restjust below the top surface of the tank. It shouldnot touch the top of the tank.


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2) Place your engine onto the enginemount. Adjust the engine is centered of theedges of the engine case.

3) When you are satisfied with the align-ment, mark the locations of the enginemounting.

MOUNTING THE ENGINE.

1) Install the pushrod housing through thepredrilled hole in the firewall and into the servocompartment. The pushrod housing shouldprotrude 1/4" out past the front of the firewall.

Make a Z-Bend 1/4" from one end of the plainwire pushrod.

4) Remove the engine. Using an drill bit,drill the mounting holes through the enginemount at the four locations marked.

Fuel fill tube.Fuel pick uptube.

Vent tube.

Battery tray.

C/A

Glu

e at

tach

men

t.

6) With the stopper assembly in place,the weighted pick up should rest about 3/8”away from the rear of the tank and move freelyinside the tank. The top of the vent tube shouldrest just below the top of the tank. It shouldnot touch the top of the tank.

7) When satisfied with the alignment ofthe stopper assembly tighten the 3mm 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.

Using a modeling knife, cut one length offuel line 20” long. Connect one line to the venttube and one line to the fuel pick up tube onthe stopper. See picture bellow.

Fuel tank.

Blow through the tubes to make sure thelines have not become kinked duringinstallation.

5) 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.


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3x25mm.

Pushrod wire.

6) Attach the Z-Bend in the pushrod wire tothe throttle arm on the carburetor.

5) Bolt the engine to the engine mount usingthe four machine screws. Double check thatall the screws are tight before proceeding.

Installing steering arm as below.

NOSE GEAR INSTALLATION.

2.5mm.

3x25mm.

112mm.

Adjust the nose gear steering arm until thearm is parallel with the fire wall.

Steering arm.

Adjustable connector.


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1) Install the rubber grommets and brasscollets onto the elevator, rudder and throttleservos. Test fit the servos into the preinstalledservo tray. Because the size of servos dif-fer, you may need to adjust the size of theprecut openings in the tray.

INSTALLING THE FUSELAGE SERVOS.

1) Install the switch into the precut holein the fuselage side. Use the two screws pro-vided with the switch to secure it in place.

INSTALLING THE SWITCH.

Switch.

Install the pushrod wire as shown.

INSTALLING THE SPINNER.

Install the spinner backplate, propeller andspinner cone. The spinner cone is held inplace using two 3 x 15mm wood screws.

The propeller should not touch any partof the spinner cone. If it does, use a sharpmodeling knife and carefully trim away thespinner cone where the propeller comes incontact with it.

AdjustableConnector.


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6) 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.

2) Position the servos into the servo traywith the output shafts orientated as shownbelow. Drill 1/16” pilot holes through the trayfor each of the mounting screws.

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

Throttle.Elevator.

Rudder.

Switch.

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.

2) Using a modeling knife, carefully removethe covering from over the vertical stabilizermounting slot in the top of the fuselage.

3) Slide the stabilizer into place in the pre-cut slot in the rear of the fuselage. The stabi-lizer should be pushed firmly against the frontof the slot.

4) 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.

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

When cutting through the covering toremove it, cut with only enough pressure toonly cut through the covering itself. Cutting intothe balsa structure may weaken it.

Remove covering.

Center line.

Pen.


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2) Slide the vertical stabilizer into the slotin the top of the fuselage. The rear edge ofthe stabilizer should be flush with the rear edgeof the fuselage and the lower rudder hingeshould engage the precut hinge slot in thelower fuselage. The bottom edge of the stabi-lizer should also be firmly pushed against thetop of the horizontal stabilizer.

3) 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) Remove the stabilizer. Using a mod-eling knife, remove the covering from belowthe lines you drew.

Pen.

Hinge slot.

in the fuselage. Slide the stabilizer in placeand realign. Double check all of your mea-surements 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.

8) 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.

VERTICAL STABILIZER INSTALLATION.

1) Using a modeling knife, remove thecovering from over the precut hinge slot cutinto the lower rear portion of the fuselage. Thisslot accepts the lower rudder hinge.

Hinge.

7) When you are sure that everything isaligned correctly, mix up a generous amountof 30 Minute Epoxy. Apply a thin layer to thetop and bottom of the stabilizer mounting areaand to the stabilizer mounting platform sides

Remove covering.


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6) When you are sure that everything isaligned correctly, mix up a generous amount of30 Minute Epoxy. Apply a thin layer to the mount-ing slot in the top of the fuselage and to the sidesand bottom of the vertical stabilizer mountingarea. Apply epoxy to the bottom and top edges

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.

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

90º

VerticalStabilizer.Horizontal

Stabilizer.

of the filler block and to the lower hinge also.Set the stabilizer in place and realign. Doublecheck all of your measurements once more be-fore the epoxy cures. Hold the stabilizer in placewith T-pins or masking tape and remove anyexcess epoxy using a paper towel and rubbingalcohol. Allow the epoxy to fully cure beforeproceeding.

CONTROL HORN INSTALLATION.

1) Locate the nylon control horns- nyloncontrol horn backplates and machine screws.

2)The position of elevator control horn onthe left side of elevator. The clevis attach- mentholes should be positioned over the hinge line.

Control Horn.

Mounting Screws. Mounting Plate.

(2) 2x20mm.

4) Mount the control horns then into themounting backplates. Do not overtighten thescrews or the backplates may crush the wood.

6) Install the rudder control horn usingthe same method as with the elevator controlhorns.

3) Using a 2mm drill bit and the controlhorns as a guide, drill the mounting holesthrough the elevator halves.

5) Position the rudder control horn on theleft side of the airplane.

Left side.


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ATTACHMENT WING - FUSELAGE.

See picture below:

BALANCING.

1) It is critical that your airplane be bal-anced correctly. Improper balance will causeyour plane to lose control and crash. The cen-ter of gravity is located 9cm back from the lead-ing edge of the wing, measured at the wingtip.

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

ELEVATOR-RUDDER PUSHRODINSTALLATION.

Elevator pushrod.

Rudder pushrod. Clevis.

Controlhorn.

Antenna.

Antenna wire.

Receiver.

Battery.

Tie wrap.

Throttle.

Elevator.

Rudder.Switch.

Wing bolt.

INSTALLING THE RECEIVER AND BATTERY.

Adjustable Servo connector.

Servo arm.(1 PCS).

(2 PCS).Thread locker glue.


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2) If the nose of the plane falls, the planeis nose heavy. To correct this first move thebattery pack further back in the fuselage. Ifthis is not possible or does not correct it, sticksmall amounts of lead weight on the fuselagesides under the horizontal stabilizer. If the tailof the plane falls, the plane is tail heavy. Tocorrect this, move the battery and receiver forward orif this is not possible, stick weight ontothe firewall. When balanced correctly, the air-plane should sit level or slightly nose downwhen you lift it up with your fingers.

CONTROL THROWS.

1) We highly recommend setting up theSEAGULL 40 using the control throws listedat right. We have listed control throws for bothLow Rate (initial test flying) and High Rate(aerobatic flying).

2) Turn on the radio system, and with thetrim tabs on the transmitter in neutral, centerthe control surfaces by making adjustmentsto the clevises or adjustable servo connectors.The servo arms should be centered also.

4) By moving the position of the adjust-able control horn out from the control surface,you will decrease the amount of throw of thatcontrol surface. Moving the adjustable con-trol horn toward the control surface will in-crease the amount of throw.

3) When the elevator, rudder and aileroncontrol surfaces are centered, use a ruler andcheck the amount of the control throw in eachsurface. The control throws should bemeasured at the widest point of each sur-face!

FLIGHT PREPARATION.

A) Check the operation and direction ofthe elevator, rudder, ailerons and throttle.

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

D) 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.

C) 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.

INITIAL FLYING/SPORT FLYING

Ailerons: 3/8” up 3/8” downElevator: 3/8 ” up 3/8” downRudder: 1/2” right 1/2” left

AEROBATIC FLYING

Ailerons: 1/2” up 1/2” downElevator: 5/8” up 5/8” downRudder: 1” right 1” left

Do not use the aerobatic settings forinitial test flying or sport flying.

E)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.

F) 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.

CG=9cm.


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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.

PREFLIGHT CHECK.

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

2) Check every bolt and every glue jointin the SEAGULL 40 to ensure that everythingis tight and well bonded.

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

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

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 SEAGULL 40 LOW WINGTRAINER.

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

Documents

SEAGULL 40SEAGULL 40 LOW WING TRAINER. Instruction Manual. 2 WING ASSEMBLY. NOTE: We highly recommend using 30 minute epoxy as it is stronger and provides more working time, allowing