Specifications:Wing span -------------------------------------------- 118.1in (300cm).Wing area ---------------------------------------- 899sq.in (58sq dm).Weight ---------------------------------------------------- 6.2lbs (2.8kg).Length -------------------------------------------------- 57.1in (145cm).Radio --------------------------------------------------------- 6 channels.Servo --------------------------------------------- 4 MN48 mini servos. 3 servos flying skill level intermediate/advanced.

ASSEMBLY MANUAL

MS:137

“Graphics and specifications may change without notice”.

(Glider)

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KA8-B Instruction Manual.

INTRODUCTION.

Thank you for choosing the KA8-B ARTF by SEAGULL MODELS. The KA8-B was designed withthe sports trainer flyer in mind. It is a High-wing aeroplane which is easy to fly and quick to assemble.The airframe is conventionally built using balsa, plywood and veneer to make it stronger than theaverage ARTF , yet the design allows the aeroplane to be kept light. You will find that most of the workhas been done for you already. The pushrods are pre-made to the correct lengths, the motor mounthas been fitted and the hinges are pre-installed and pinned for security. Flying the KA8-B is simplya joy.

This instruction manual is designed to help you build a great flying aeroplane. Please read thismanual throughly before starting assembly of your KA8-B. Use the parts listing below to identify allparts.

WARNING.

Please be aware that this aeroplane is not a toy and if it is assembled or used incorrectly it will causeinjury 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 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.

ADDITIONAL ITEMS REQUIRED.

- 6 channels radio with 7 servos.- Glow plug to suit engine.- Propeller to suit engine.- Protective foam rubber for radiosystem.- Silicone fuel line.- Stick-on weights for balance

(If necessary).

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 ASSEMBLY1) Fuselage.

WING ASSEMBLY1) Right wing half with pre-installedaileron.2) Left wing half with pre-installed aileron.

TAIL SECTION ASSEMBLY1) Vertical stabilizer with pre-installedrudder.2) Horizontal stabilizer with pre-installedelevartor halves.

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Instruction Manual.

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.

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.

HINGING THE RUDDER .

Note:

Hinge.

T-pin.

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.

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

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

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.

Note:

Hinge.

C/A glue.

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KA8-B Instruction Manual.

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.

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

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

Note:

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.

HINGING THE ELEVATOR .

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Instruction Manual.

Aileron control horn.

INSTALL THE AILERON CONTROLHORN .

2 sets.3x35mm.

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

2) Position the control horn on the bottom ofthe aileron. You will see pre-drill hole 6mm forthe horn mounting screw on the aileron.

3) Place epoxy into hole. This will harden thethreads and prevent the crews from pullingloose.

4) Thread a control horn end with aluminumwasher, lock nut until the top edge of the end is9mm from the vase of the horn as shown.

6mm.

ELEVATOR CONTROL HORNINSTALLATION.

2 sets.3x35mm.

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

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KA8-B Instruction Manual.

Rudder servo .

SERVO ARM INSTALLATION.

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

Adjustable Servoconnector.

Servo arm.

Loctite secure.

1 PCS.

Elevator servo .

Elevator control horn.

6mm.

INSTALLING THE FUSELAGE SERVO.

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.

Throttle servo .

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Instruction Manual.

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

String.Small weight.

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

INSTALLING THE SWITCH.

Switch.

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 ofthe mount allow the servo lead to pass through.

AILERON SERVO INSTALLATION.Rudder servo arm.

Elevator servo arm.

Trim and cut.

Throttle servo arm.

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KA8-B Instruction Manual.

Snap keeper.

Servo arm.

8mm

Snap keeper.

M2 lock nut. Metal clevis.

8mm

Cut.

AILERON PUSHROD HORN INSTALLATION

FLAP SERVO INSTALLATION.

Attach the string to the servo lead and carefully thread it though the wing.

M2x6mm.Wing rib.

Wing.

Small weight.

String.

Flap servo.

M2x6mm.

Aileron servo.

Aileron servo.

Flap servo.

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Instruction Manual.

AIRBREAKES PUSHROD CONTROLHORN INSTALLATION.

M2x6mm.

Repeat the procedure for the otheraileron servo.

C/A glue.

C/A glue.

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KA8-B Instruction Manual.

ELEVATOR PUSHROD INSTALLATION.

M3x30mm.

M3x30mm.

678mm.

Cut.

THE HORIZONTAL STABILIZER INSTALLATION.

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Instruction Manual.

8mm

Cut.

Pen.

8mm

Snap keeper.

3mm

3mm

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KA8-B Instruction Manual.

RUDDER PUSHROD.

M2x12mm.

Snap keeper.

Servo arm.

8mm

Snap keeper.

M2 lock nut. Metal clevis.

Pen.

8mm

Cut.

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Instruction Manual.

SERVO INSTALLATION.

The tow hook.

The above is the tow hook position.

C/A glue.

C/A glue.

Cut.

Cut.

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KA8-B Instruction Manual.

Receiver.

Battery.

ATTACHMENT WING -FUSELAGE.

Wing bolt.

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 LOCATED60 MM BACK FROM THE LEADING EDGEOF THE WING AT THE WING ROOT.

3) Turn the airplane upside down. Placeyour fingers on the masking tape and carefullylift the plane .

2) Mount the wing to the fuselage. Using acouple of pieces of masking tape, place themon the top side of the wing 60 mm back fromthe leading edge of the wing at the wing root.

INSTALLING THE RECEIVER AND BATTERY.

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

3) Route the antenna in the antenna tubeinside the fuselage and secure it to the bottomof fuselage using a plastic tape.

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

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Instruction Manual.

CONTROL THROWS.

Ailerons: 15mm up 15mm down.

Elevator: 15mm up 15mm down.

Rudder: 25mm right 25mm left.

60mm.

*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* tothe tail to balance.

Accurately mark the balance point on the topof the wing on both sides of the fuselage. Thebalance point is located 60 mm back fromthe leading edge of the wing at the wing root.This is 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 .

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KA8-B Instruction Manual.

E) Check the throttle. Moving thethrottle stick forward should open the carbu-retor barrel. If it does not, flip the servo re-versing switch on your transmitter to changethe direction.

FLIGHT PREPARATION.

C) Check the elevator first. Pull backon the elevator stick. The elevator halvesshould move up. If it they do not, flip the servoreversing switch on your transmitter to changethe direction.

D) Check the rudder. Looking frombehind the airplane, move the rudder stick tothe right. The rudder should move to the right.If it does not, flip the servo reversing switch onyour transmitter to change the direction.

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

B) Plug in your radio system per themanufacture’s instructions and turn every thingon.

F) From behind the airplane, look atthe aileron on the right wing half. Move theaileron stick to the right. The right aileronshould move up and the other aileron shouldmove down. If it does not, flip the servo re-versing switch on your transmitter to changethe direction.

PREFLIGHT CHECK.

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

2) Check every bolt and every glue jointin the KA8-B to ensure that everything is tightand well bonded.

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

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.

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

We wish you many safe and enjoyableflights with your KA8-B.

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

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