SPORTS TRAINER - ENGINE SIZE.40 - .46 - 2STROKE Hand-made Almost Ready to Fly R/C Model Aircraft ASSEMBLY MANUAL Specifications Wing span ____________________________ 155cm. Wing area _________________________ 3950 sq cm . Approximate flying weight _______________ 2.6-2.8kg. Recommended engine size 0.40-0.46 cu. ins 2-stroke. Recommended R/C __________ 4 channels minimum. Flying skill level ___________________ Sports Trainer. Electric conversion: optional Additional items required. Engine.
BOOMERANG 40. Instruction Manual. INTRODUCTION. Thank you for choosing the Boomerang 40 ARTF by SEAGULL MODELS. The Boomerang 40 was designed with the 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 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.
BOOMERANG 40. NOTE: 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 Boomerang 40 is made from natural materials and minor adjustments may have to be made.
BOOMERANG 40. Instruction Manual. Epoxy. 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.
BOOMERANG 40. HINGING THE RUDDER. Glue the rudder hinges in place using the same techniques used to hinge the ailerons. Instruction Manual. 2) Remove the brace when satisfied with its fit ineach wing half. Coat both sides of one half of the dihedral brace with 30 minute epoxy. Next, pour some epoxy into the dihedral box in one wing panel. Make sure you cover the top and bottom as well as the sides of the dihedral brace. Use enough epoxy to fill any gaps.
BOOMERANG 40. 5. Carefully apply masking tape around the top and bottom edge of the root rib of each wing half to protect them from damage caused by epoxy. 6. Mix a generous amount of 30 minute epoxy. Coat the exposed half of the dihedral brace, and the remaining wing joiner box and both root ribs with epoxy. Slide the two wing halves together and carefully align them at the leading and trailing edges. Wipe away any excess epoxy using paper towels.
BOOMERANG 40. Instruction Manual. INSTALLING THE AILERON SERVO. Install the aileron servo into the servo mount, with the output shaft towards the leading edge of the wing, using the wood screws provided with your radio system. Drill 1/16” pilot holes through the mount before installing the screws. This will prevent the wood from splitting. Wire keeper. Pushrod wire. INSTALLING THE AILERON LINKAGE. 1. Thread one nylon adjustable control horn onto each aileron torque rod.
BOOMERANG 40. Instruction Manual. INSTALLING THE NOSE GEAR WHEEL. Pen. Plastic trap. 4. Insert the main gear wire into the mounting slot. 5. Remove the two straps and the gear wire. Drill four 3/32” pilot holes into the fuselage for the wood screws. 2mm. ENGINE MOUNT INSTALLATION. 1) Locate the items necessary to install the engine mount included with your model. . 4x30mm. 3mm X 12mm. 8 2) Use four 4x30mm head bolts and four 4mm washers to attach the engine mount rails to the firewall.
BOOMERANG 40. Instruction Manual. FUEL TANK. INSTALLING THE STOPPER ASSEMBLY. 1. Using a modeling knife, carefully cut off the rear portion of one of the two nylon tubes leaving 1/2” protruding from the rear of the stopper. This will be the fuel pick up tube. 2. Using a modeling knife, cut one length of silicon fuel line (not included) to 2-1/4” long. Connect one end of the line to the weighted fuel pickup and the other end to the nylon pickup tube. 3.
BOOMERANG 40. Instruction Manual. Fuel tank. Top of tank. Vent tube. Fuel fill tube. Fuel tank. Fuel pickup tube. B C/A glue. INSTALLING THE FUEL TANK. 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. 1) Slide the fuel tank into the fuselage. Guide the lines from the tank through the hole in the firewall. Vent tube.
BOOMERANG 40. Instruction Manual. Elevator servo. Rudder servo. Trim and cut. Throttle servo. THROTTLE SERVO ARM INSTALLATION. Install adjustable servo connector in the servo arm as same as picture below: Loctite secure. Adjustable Servo connector. Servo arm. Switch. Nut. MOUNTING THE ENGINE. PARTS REQUIRED. Elevator servo arm. Throttle servo arm. 1. Install the pushrod housing through the predrilled hole in the firewall and into the servo compartment.
BOOMERANG 40. Instruction Manual. 3mm X 15mm. Pushrod wire. 4. Remove the engine. Using an drill bit, drill the mounting holes through the engine mount at the four locations marked. 1.5mm. NOSE GEAR INSTALLATION. 1.5mm. 5. Bolt the engine to the engine mount using the four machine screws. Double cheek that all the screws are tight before proceeding. 6. Attach the Z-Bend in the pushrod wire to the throttle arm on the carburetor.
BOOMERANG 40. Installing steering arm as follow. Instruction Manual. - Model size: .35-.45 size models Motor: 35mm 830 rev per volt Propeller: 10x7 ESC: 50A Lipo Batteries: 4cell 3200mA 2) Attach the electric motor box to the firewall suitable with the cross lines drawn on the electric motor box and firewall. Using epoxy and balsa stick to secure the motor box to the firewall. Please see pictures below. Steering arm. Adjust the nose gear steering arm until the arm is parallel with the fire wall. 3mm.
BOOMERANG 40. Instruction Manual. Blind nut. Blind nut. Battery. M4x70mm. Speed control. M3x15mm. INSTALLING THE SPINNER. 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 in contact with it.
BOOMERANG 40. Instruction Manual. 3. Slide the stabilizer into place in the precut slot in the rear of the fuselage. The stabilizer should be pushed firmly against the front of the slot. 4. With the stabilizer held firmly in place, use a pen and draw lines onto the stabilizer where it and the fuselage sides meet. Do this on both the right and left sides and top and bottom of the stabilizer. Pen. HORIZONTAL STABILIZER. 1.
BOOMERANG 40. Instruction Manual. 7. When you are sure that everything is aligned correctly, mix up a generous amount of 30 Minute Epoxy. Apply a thin layer to the top and bottom of the stabilizer mounting area and to the stabilizer mounting platform sides in the fuselage. Slide the stabilizer in place and realign. Double check all of your measurements once more before the epoxy cures.
BOOMERANG 40. Instruction Manual. 4. Slide the vertical stabilizer back in place. Using a triangle, check to ensure that the vertical stabilizer is aligned 90º to the horizontal stabilizer. Horizontal Stabilizer. 90º Control Horn. Vertical Stabilizer. Mounting Screws. 5. When you are sure that everything is aligned correctly, mix up a generous amount of Flash 30 Minute Epoxy.
BOOMERANG 40. Instruction Manual. Pen. Pen. 8mm. 8mm. Cut. Elevator. RUDDER PUSHROD HORN INSTALLATION. Rudder. Control horn. INSTALLING THE RECEIVER AND BATTERY. 1) Plug the five servo leads and the switch lead into the receiver. Plug the battery pack lead into the switch also. Rudder pushrod. 2) Wrap the receiver and battery pack in the protective foam rubber to protect them from vibration.
BOOMERANG 40. Instruction Manual. 1) Test fit the fin and the tail gear, to make sure that everything fits properly. When you are happy with the fit, glue the fin permanently in place. Receiver. 2) See below picture how to assembly the tail-Dragger Conversion. Battery. ATTACHMENT WING-FUSELAGE. Wing bolt. TAIL - DRAGGER CONVERSION. M3x12mm.
BOOMERANG 40. Instruction Manual. 2. Using the two landing gear straps as a guide, mark the locations of the four 3mm x 12mm mounting screws onto the fuselage surface. 3. The landing gear wire is held in place using two nylon landing gear straps and four 3mm x 12mm wood screws. The straps should be located equal distance from the inside and outside ends of the wire. Pen. M3x12mm. Plastic trap. 4. Insert the main gear wire into the mounting slot. 5. Remove the two straps and the gear wire.
BOOMERANG 40. Instruction Manual. Lift the model. If the tail drops when you lift, the model is “tail heavy” and you must add weight* to the nose. If the nose drops, it is “nose heavy” and you must add weight* to the tail to balance. 3mm X 12mm. *If possible, first attempt to balance the model by changing the position of the receiver battery and receiver. If you are unable to obtain good balance by doing so, then it will be necessary to add weight to the nose or tail to achieve the proper balance point.
BOOMERANG 40. INITIAL FLYING/SPORT FLYING Ailerons: Elevator: Rudder: 3/8” up 3/8” up 1/2” right 3/8” down 3/8” down 1/2” left AEROBATIC FLYING Ailerons: 1/2” up Elevator: 5/8” up Rudder: 1” right 1/2” down 5/8” down 1” left Do not use the aerobatic settings for initial test flying or sport flying. 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.
