Seagull Models HARMON ROCKET III Assembly Manual Download Page 2 | Manualshive

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HARMON ROCKET III.

Instruction Manual.

2

INTRODUCTION.

Thank you for choosing the

Harmon Rocket III

ARTF by SEAGULL MODELS. The

Harmon Rocket

III

was designed with the intermediate/advanced sport flyer 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.Flying the

Harmon Rocket III

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

Harmon Rocket III

. 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.

.40-.46 2-stroke engine
.52-.82 4-stroke engine
Computer radio with six 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
(1) Canopy hatch

WING ASSEMBLY

(1) Right wing half with pre-installed
aileron
(1) Left wing half with pre-installed
aileron
(1) Aluminium dihedral brace

Tail section assembly

(1) Horizontal stabilizer with pre-
installed elevator halves

Some more parts.

HARDWARE PACK

COWLING
Landing gear.....

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Summary of Contents for HARMON ROCKET III

Page 1: ...anual Specifications Wingspan 50 4in 128cm Wing area 558sq in 36 sq dm Approximate flying weight 6 2 6 4lbs 2 8 2 9kg Length 51 6in 131cm Recommended engine size 40 46 cu in 2 stroke 52 82 cu in 4 stroke Radio System required 4 channel with 6 servos Flying skill level Intermediate advanced Hand made Almost Ready to Fly R C Model Aircraft ASSEMBLY MANUAL ...

Page 2: ...enced 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 40 46 2 stroke engine 52 82 4 strok...

Page 3: ...y fit and are aligned properly before gluing This will ensure proper as sembly as the Harmon Rocket III 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 chemi cals including the following paint thinner cyano acrylate glue accel erator cyanoacrylategluede bonder and aceton...

Page 4: ...is will help ensure an equal amount of hinge is on either side of the hinge line when the aileron is mounted to the wing panel HINGING THE AILERONS 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 7 Repeat this process with the other wing panel sec...

Page 5: ...e 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 horizontal stabilizer panel and elevator 5 Turn the horizontal stabilizer panel over and deflect the elevator in the opposite direction from the opposite side Apply thin CA glue to each hinge making sure that the C A penetrates i...

Page 6: ...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 fuselage panel and rudder 3 Slide the rudder on the fuselage panel until there is only a slight gap The hinge is now centered on the fuselage panel and rudder Remove the T pins and snug the rudder against the fuselage panel A gap of 1 64 or...

Page 7: ... stronger and provides more working time allowing the builder to properly align the parts Using fast cure epoxy whenjoiningthewinghalvescouldresultinthe glue drying before the wing halves are aligned properly which may result in failure of the wing centre section during flight 3 Peel off the backing from the self adhe sive covering strip Apply the strip to the centre section of the wing starting f...

Page 8: ...ervos without throttle 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 Install the rubber grommets and brass collets onto the aileron servo Test fit the servo into the aileron servo mount Install the servo into the servo tray Using a small weight Weighted fuel pick up...

Page 9: ...STALLING THE AILERON LINKAGE 1 Using a ruler pen to draw a straight line as below picture Install the aileron servo tray into the servo mount Repeat the procedure for orther wing haft Thread Pen Straight line Servo arm Thread Thread Small weight Plastic tape ...

Page 10: ...ood 6 Thread one nylon adjustable control horn onto each aileron control rod Thread the horns on until they are flush with the ends of the control rods Repeat the procedure for the other aileron servo Cut M2 lock nut Snap keepper M2 clevis 2 Locate the two nylon control horns two nylon control horn backplates and two machine screws Control Horn Mounting Screws Mounting Plate 2MM x 30 MM 3 Position...

Page 11: ...le This tube is the vent tube 4 Carefully heat the vent tube using a heat gun or lighter to permanently set the angle of the tube Silicon tubing not inclued Vent tube Fuel Pickup Tube Fuel Fill Tube Important When the stopper assembly is installed 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 When the stopper assembl...

Page 12: ...d 1 4 from one end of the plain wire pushrod 2 Place your engine onto the engine mount Adjust the engine is centered of the edges of the engine case 4 Remove the engine Using an drill bit drill the mounting holes through the engine mount at the four locations marked 3 When you are satisfied with the align ment mark the locations of the engine mounting inside the tank The top of the vent tube shoul...

Page 13: ...he cowl with the marks you made on the fuselage then trim and cut 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 crank shaft is in nearly the middle of the cowl open ing Use the spinner backplate as a guide Hold the cowl firmly in place using pieces of mask ing tape Trim ...

Page 14: ...e Connect the fuel and pressure lines to the carburetor muffler and fuel filler valve 1 5mm wire needle valve 1 Install the spinner backplate propeller and spinner cone The spinner cone is held in place using two 3mm x 12mm wood screws 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...

Page 15: ...RED 1 Assembling and mounting the wheel pants as shown below pictures 2 Follow diagram below for wheel pant installation 10MM 3 You have to trim each axle using a toll cutting and cut off wheel Caution when cutting the axles and wear protective goggles Wheel Collar Axle Wheel Nut Wheel Pant Landing Gear Nut Plywood Washer ...

Page 16: ...O INSTALLATION 2 Install the rubber grommets and brass collets onto the aileron servo Test fit the servo into the aileron servo mount 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 A drop of C A glue on the wheel collar screws will help keep them from coming lose during ...

Page 17: ...m of the stabilizer 6 Using a modeling knife carefully re move the covering that overlaps the stabilizer mounting platform sides in the fuselage Re move the covering from both the top and the bottom of the platform sides Remove covering 8 After the epoxy has fully cured re move the masking tape or T pins used to hold the stabilizer in place Carefully inspect the glue joints Use more epoxy to fill ...

Page 18: ...cut with only enough pressure to only cut through the covering itself Cutting into the balsa structure may weaken it Pen VERTICAL STABILIZER INSTALLATION 2 Slide the vertical stabilizer into the slot in the top of the fuselage The rear edge of the stabilizer should be flush with the rear edge of the fuselage and the lower rudder hinge should engage the precut hinge slot in the lower fuselage The b...

Page 19: ...res Hold the stabilizer in place with T pins or masking tape and remove any excess epoxy using a paper towel and rubbing alcohol Allow the epoxy to fully cure before proceeding 3 Using a 1 5mm drill bit and the control horns as a guide drill the mounting holes through the elevator halves Control Horn Mounting Screws Mounting Plate 4 Mount the control horns by inserting the bolts through the contro...

Page 20: ...re down slightly so it lines up with the clasp without binding 5 Rudder pushrods assembly follow picture below 3 While holding the clasp firmly in place use a pen and outline the clasp onto the rud der 4 Remove the clasp and using a model ing knife remove the covering from inside the lines you drew Use 220 grit sandpaper and carefully roughen the inside surface of the ny lon clasp 4 One at a time ...

Page 21: ...Drill two 3 32 holes through the tray for the screws to pass through 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 2 Install the rubber grommets and brass collets onto the throttle servo Test fit the servo into the aileron servo mount 3 Secure the servos with the screws p...

Page 22: ...Rubber Band Modified Servo Arm Cut When balancing the airplane you may need to move the battery or receiver for ward or after to achieve proper balance 4 Using a 1 16 drill bit drill a hole through the side of the fuselage near the receiver for the antenna to exit Route the antenna out of the fuselage and secure it to the vertical stabi lizer using a rubber band and a modified servo arm See pictur...

Page 23: ...ight 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 should move in the correct direction and not bind in any way 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 vi bration which could...

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