PERCIVAL MEW GULL MS: SEA 98. ASSEMBLY MANUAL “Graphics and Specfications may change without notice”. Specifications Wingspan--------------------------------- 74 in ------------------------ 188cm. Wing area-------------------------------- 797.2 sq.in ---------- 51.4 sq.dm. Weight------------------------------------ 11lbs ---------------------- 4.5 -5 kg. Length------------------------------------- 60.7 in ------------------- 154.3cm. Recommended engine size---------- 1.20 cu.in ---------------- 2-stroke. 1.25-1.50----------------- 4-stroke. Radio System required 6 channel with 6 digital servos. Flying skill level Intermediate/advanced. Kit features. • • • Ready-made—minimal assembly & finishing required. Ready-covered covering. Photo-illustrated step-by-step Assembly Manual. Made in Vietnam. PERCIVAL MEW GULL . Instruction Manual. INTRODUCTION. Thank you for choosing the PERCIVAL MEW GULL ARTF by SEAGULL MODELS. The PERCIVAL MEW GULL was designed with the intermediate/advanced sport flyer in mind. It is a 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. The motor mount has been fitted and the hinges are pre-installed . Flying the PERCIVAL MEW GULL 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 PERCIVAL MEW GULL . 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. 1.20 cu.in 1.25 - 1.50 2-stroke 4-stroke engine Radio System required 4 channels with 6 digital servos 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 2 PARTS LISTING. FUSELAGE ASSEMBLY (1) Fuselage (1) Canopy WING ASSEMBLY (1) Right wing half/ aileron (1) Left wing half with/ aileron (1) Aluminium dihedral brace Tail section assembly (1) Horizontal stabilizer/ elevator halves. (1) Rudder halves. Some more parts. HARDWARE PACK COWLING Landing gear..... www.seagullmodels.com 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 PERCIVAL MEW GULL 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 chemicals including the following: paint thinner, cyano-acrylate glue accelerator, cyanoacrylate glue de-bonder and acetone. Do not let these chemicals come in contact with the colours on the covering and the plastic parts. Hinge 3) Slide the wing panel on the aileron until there is only a slight gap. The hinge is now centered on the wing panel and aileron. Remove the T-pins and snug the aileron against the wing panel. A gap of 1/64” or less should be maintained between the wing panel and aileron. T-pins. Hinge. HINGING THE AILERONS. Note: The control surfaces, including the ailerons, elevators, and rudder, are prehinged with hinges installed, but the hinges are not glued in place. It is imperative that you properly adhere the hinges in place per the steps that follow using a high-quality thin C/A glue. 1) Carefully remove the aileron from one of the wing panels. Note the position of the hinges. 2) Remove each hinge from the wing panel and aileron and place a T-pin in the center of each hinge. Slide each hinge into the wing panel until the T-pin is snug against the wing panel. This will help ensure an equal amount of hinge is on either side of the hinge line when the aileron is mounted to the aileron. 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. 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. 5) Turn the wing panel over and deflect the aileron in the opposite direction from the opposite side. Apply thin C/A glue to each hinge, making sure that the C/A penetrates into both the aileron and wing panel. 6) Using C/A remover/debonder and a paper towel, remove any excess C/A glue that may have accumulated on the wing or in the aileron hinge area. 3 PERCIVAL MEW GULL . 7) Repeat this process with the other wing panel, securely hinging the aileron in place. 8) After both ailerons are securely hinged, firmly grasp the wing panel and aileron to make sure the hinges are securely glued and cannot be pulled out. Do this by carefully applying medium pressure, trying to separate the aileron from the wing panel. Use caution not to crush the wing structure. Instruction Manual. AILERON CONTROL HORN Aileron control horn installation: See pictures below. 2 sets. 3x40mm. CONTRONL HORN M3 SCREW. Note: Work the aileron up and down several times to “work in” the hinges and check for proper movement. Epoxy. ALUMINUM WASHER. HINGING THE ELEVATOR. Glue the elevator hinges in place using the same tectniques used to hinge the ailerons. HINGING THE RUDDER. M3 LOCK NUT. ALUMINUM WASHER. 18mm . Epoxy. Glue the rudder hinges in place using the same tectniques used to hinge the ailerons. Wing bottom. Aileron control horn. Hinge. 4 Aileron. www.seagullmodels.com ELEVATOR CONTROL HORN. RUDDER CONTROL HORN. Install the elevator control horn using the same method as with the aileron control horns. Rudder control horn: Using the same tectniques used aileron control horn. See picture below. 2 sets. 2 sets. 3x50mm. 3x45mm. CONTRONL HORN M3 CONTRONL HORN . M3 SCREW ALUMINUM WASHER. Aluminum Washer. EPOXY. Epoxy. Horizontal stabilizer Elevator Rudder FUSELAGE ALUMINUM WASHER. Aluminum Washer. M3 LOCK NUT. M3 LOCK NUT. EPOXY. Horizontal Stabilizer. Elevator. 18mm. EPOXY. Rudder. Fuselage. 18mm. Rudder control horn. Elevator control horn. Hinge. 5 PERCIVAL MEW GULL . ENGINE MOUNT INSTALLATION. see pictures below.Make yourself the template of your engine on paper. Instruction Manual. 3) Carefully bend the second nylon tube up at a 45º angle. This tube is the vent tube. 4x30mm. Mark and drill 4 holes for engine mount. Insert 4 blind nuts to firewall. Thread locker glue. Balsa wood. Vent tube. Fuel pick up tube. INSTALLING THE STOPPER ASSEMBLY. Fuel fill tube. 1) Using a modeling knife, carefully cut off the rear portion of one of the 3 nylon tubes leaving 1/2” protruding from the rear of the stopper. This will be the fuel pick up tube. Carefully use a lighter or heat gun to permenently set the angle of the vent tube. 2) Using a modeling knife, cut one length of silicon fuel line. Connect one end of the line to the weighted fuel pick up and the other end to the nylon pick up 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. 6 www.seagullmodels.com 4) Test fit the stopper assembly into the tank. It may be necessary to remove some of the flashing around the tank opening using a modeling knife. If flashing is present, make sure none falls into the tank. 5) With the stopper assembly in place, the weighted pick-up should rest away from the rear of the tank and move freely inside the tank. The top of the vent tube should rest just below the top of the tank. It should not touch the top of the tank. 6) When satisfied with the alignment of the stopper assembly tighten the 3 x 20mm machine screw until the rubber stopper expands and seals the tank opening. Do not overtighten the assembly as this could cause the tank to split. FUEL TANK INSTALLATION. Vent tube. Fuel pick-up tube. Fuel fill tube. Blow through one of the lines to ensure the fuel lines have not become kinked inside the fuel tank compartment. Air should flow through easily. 2 _ Electric Conversion (EP Power) (OPTION). Pictures and instruction will update soon . 1 _ Glow Engine. INSTALLING THE BATTERY. Battery. 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. INSTALLING THE MAIN GEAR WIRES. A. Rubber band. B. Fuel tank. 1) Using a modeling knife, remove the covering from over the two main gear mounting slots located in the bottom of the wing. 7 PERCIVAL MEW GULL . Instruction Manual. 2) Insert the 90º bend of one main gear wire and support mounting block into the predrilled hole in one mounting slot. Axle. Wheel collar. Remove covering. 1.5mm. M3 x 15mm. Axle. Wheel. M3 x 10mm. Wheel collar. M8. M3 x 10mm. Landing gear. 8 M4 x 6mm. www.seagullmodels.com M3 x 10mm. M3 x 10mm. 150mm. M3 x 10mm. 4.2 mm diameter. M3 x 10mm. MOUNTING THE ENGINE. 1) Install the pushrod housing through the predrilled hole in the firewall and into the servo compartment. The pushrod housing should protrude 1/4" out past the front of the firewall. Make a Z-Bend 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. 5) Bolt the engine to the engine mount using the four machine screws. Double check that all the screws are tight before proceeding. 6) Attach the Z-Bend in the pushrod wire to the throttle arm on the carburetor. Pushrod wire. 3) When you are satisfied with the alignment, mark the locations of the engine mounting. 4) Remove the engine. Using an drill bit, drill the mounting holes through the engine mount at the four locations marked. Machine Screw M4x30mm. 9 PERCIVAL MEW GULL . Instruction Manual. Because of the size of the cowl, it may be necessary to use a needle valve extension for the high speed needle valve. Make this out of sufficient length 1.5mm wire and install it into the end of the needle valve. Secure the wire in place by tightening the set screw in the side of the needle valve. COWLING INSTALLATION. 1) Slide the fiberglass cowl over the engine and line up the back edge of the 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 crankshaft is in nearly the middle of the cowl opening. Use the spinner backplate as a guide. Hold the cowl firmly in place using pieces of masking tape. 3) Install the muffler and muffler extension onto the engine and make the cut out in the cowl for muffler clearance. Connect the fuel and pressure lines to the carburetor, muffler and fuel filler valve. Secure the cowl to fuselage using the 3x10mm screws (4). Trim and cut. Machine Screw M3x10mm. . Trim and cut. Trim and cut. 10 www.seagullmodels.com SPINNER INSTALLATION. Install the spinner backplate, propeller and spinner cone. Elevator servo . Throttle servo . 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. Rudder servo . Elevator servo . needle valve. INSTALLING THE SWITCH. Install the switch into the precut hole in the side of fuselage. Switch. INSTALLING THE FUSELAGE SERVO. THROTTLE SERVO ARM INSTALLATION. 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 adjustable servo connector in the servo arm . Loctite secure. Adjustable Servo connector. 1) Install the rubber grommets and brass collets onto the throttle servo. Test fit the servo into the aileron servo mount. 2) Secure the servos with the screws provided with your radio system. Servo arm. 1 PCS. 11 PERCIVAL MEW GULL . Instruction Manual. Installing the aileron servo in place using the same techniques used to flap servo. Throttle servo arm. Elevator servo. Small weight. String. Rudder servo. Aileron Servo. Elevator servo. Electric wire. INSTALLING THE AILERON SERVOS. Servos. Small weight. Thread. Wing. Wing rib. INSTALLING THE AILERON SERVOS. Small Weight. Small Weight. String. String. Attach the string to the servo lead and carefully thread it though the wing. AILERON PUSHROD HORN INSTALLATION Wing. 85mm. M3 clevis. M3 lock nut. Aileron. 110mm. 12 www.seagullmodels.com Wing. Aileron. Wing. Aileron. Wing. M3 lock nut. Epoxy. Aileron. Repeat the procedure for the other wing. WING ASSEMBLY. NOTE: We highly recommend using 30 minute epoxy as it is stronger and provides more working time, allowing the builder to properly align the parts. Using fast cure epoxy when joining the wing halves could result in the glue drying before the wing halves are aligned properly which may result in failure of the wing centre section during flight. 2) Remove the brace when satisfied with its fit in each 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. 1) Test fit the wing tube into each wing half. The brace should slide in easily up to the centreline that you drew. If not, use 220 grit sandpaper with a sanding block and sand down the edges and ends of the brace until it fits properly. Masking tape. 13 PERCIVAL MEW GULL . Instruction Manual. Carefully slide the two wing halves together and firmly press them together, allowing the excess epoxy to run out. There should not be any gap in the wing halves. Use rubbing alcohol and a paper tower to clean up any excess epoxy. Apply masking tape at the wing join to hold the wing halves together securely. INSTALLING VERITICAL FIN. Masking tape. 1) Remove the covering as picture shown below. 3) Peel off the backing from the self adhesive covering strip. Apply the strip to the centre section of the wing starting from the bottom trailing edge. Wrap the strip all the way around the wing until it meets the trailing edge again. Trim off any excess strip. MOUNTING THE TAIL WHEEL. Hinge. See pictures below. Masking tape. Cut. M3 x 25mm. Remove the covering. M3 x 25mm. 14 Epoxy. www.seagullmodels.com Cut. Epoxy. Epoxy. Epoxy. Epoxy. Covering strip. Hinge. Hinge slot. C/A glue. 2) 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. Put the stabilizer in place and realign. Double check all of your measurements once more before the epoxy cures. Hold the stabilizer in place with T-pins or masking tape and remove any excess epoxy using a paper towel and rubbing alcohol. INSTALLING HORIZONTAL FIN. 1) Remove the covering as same as pictures shown below. 2) Sand the aluminium tube using sandpaper. This will improve the bond of the epoxy to the cardboard horizontal fin. Coat both sides of one half of the aluminium tube with 30 minute epoxy. Next, pour some epoxy into the cardboard horizontal fin. Use enough epoxy to fill any gaps. 15 PERCIVAL MEW GULL . Instruction Manual. Epoxy. 3) Insert aluminium tube into the cardboard of fuselage. Aluminium tube. 3 x 70mm. Epoxy. Cut. 4) Slide the two horizontal fin halves together and carefully align them at the possition on the fuselage. Wipe away any excess epoxy using paper towels. Fill epoxy. Epoxy. Epoxy. 16 www.seagullmodels.com Rudder control horn. Elevator control horn. ELEVATOR - RUDDER PUSHROD HORN INSTALLATION. M2 clevis. 1) Elevator and rudder pushrods assembly follow pictures below. M2 Lock nut. Attach to elevator - rudder control horn. Attach to servo arm in fuselage. Throttle. Rudder. Elevator. Control horn. Metal clevis. M2 lock nut. Elevator pushrod. Elevator Pushrod. Rudder pushrod. 17 PERCIVAL MEW GULL . Instruction Manual. 2) Install servos arm to servos. Notice the position of the servo arms on the servos. See picture below. Elevator. C/A glue. A. Throttle. Rudder. INSTALLING THE RECEIVER. Elevator. 1) Plug the servo leads and the switch lead into the receiver. Plug the battery pack lead into the switch also. 2) Wrap the receiver and battery pack in the protective foam rubber to protect them from vibration. A. 3) Route the antenna in the antenna tube inside the fuselage and secure it to the bottom of fuselage using a plastic tape. See picture below. Receiver. A. Epoxy. Tie Wrap. Antenna. 18 www.seagullmodels.com ATTACHMENT WING - FUSELAGE. Bolt the wing to fuselage. CONTROL THROWS. 1) We highly recommend setting up the PERCIVAL MEWGULL using the control throws listed at right. We have listed control throws for Low Rate (initial test flying/sport flying) (aerobatic flying). Wing bolt. 2) Turn on the radio system, and with the trim tabs on the transmitter in neutral, center the control surfaces by making adjustments to the clevises or adjustable servo connectors. The servo arms should be centered also. BALANCING. 1) It is critical that your airplane be balanced correctly. Improper balance will cause your plane to lose control and crash. The center of gravity is located 70mm back from the leading edge of the wing, measured at the wing tip. 2) If the nose of the plane falls, the plane is nose heavy. To correct this first move the battery pack further back in the fuselage. If this is not possible or does not correct it, stick small amounts of lead weight on the fuselage sides under the horizontal stabilizer. If the tail of the plane falls, the plane is tail heavy. To correct this, move the battery and receiver forward or if this is not possible, stick weight onto the firewall or use a brass heavy hub spinner hub. When balanced correctly, the airplane should sit level or slightly nose down when you lift it up with your fingers. 3) When the elevator, rudder and aileron control surfaces are centered, use a ruler and check the amount of the control throw in each surface. The control throws should be measured at the widest point of each surface! INITIAL FLYING/SPORT FLYING Ailerons: Elevator: Rudder: 10mm” up 10mm” down. 10mm” up 10mm” down. 15mm” right 15mm” left. AEROBATIC FLYING Ailerons: 15mm” up 15mm” down. Elevator: 15mm” up 15mm” down. Rudder: 20mm” right 20mm” 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. Moving the adjustable control horn toward the control surface will increase the amount of throw. FLIGHT PREPARATION. A) Check the operation and direction of the elevator, rudder, ailerons and throttle. B) Plug in your radio system per the manufacturer's instructions and turn everything on. 70mm C) Check the elevator first. Pull back on the elevator stick. The elevator halves should move up. If it they do not, flip the servo reversing switch on your transmitter to change the direction. 19 PERCIVAL MEW GULL . D) Check the rudder. Looking from behind the airplane, move the rudder stick to the right. The rudder should move to the right. If it does not, flip the servo reversing switch on your transmitter to change the direction. F) From behind the airplane, look at the aileron on the right wing half. Move the aileron stick to the right. The right aileron should move up and the other aileron should move down. If it does not, flip the servo reversing switch on your transmitter to change the direction. E) Check the throttle. Moving the throttle stick forward should open the carburetor barrel. If it does not, flip the servo reversing switch on your transmitter to change the direction. PREFLIGHT CHECK. 1) Completely charge your transmitter and receiver batteries before your first day of flying. 2) Check every bolt and every glue joint in the PERCIVAL MEW GULL to ensure that everything is tight and well bonded. 20 Instruction Manual. 3) Double check the balance of the airplane. 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. 5) If your radio transmitter is equipped with dual rate switches double check that they are on the low rate setting for your first few flights. 6) Check to ensure the control surfaces are moving the proper amount for both low and high rate settings. 7) Check the receiver antenna. It should be fully extended and not coiled up inside the fuselage. 8) Properly balance the propeller. An out of balance propeller will cause excessive vibration which could lead to engine and/or airframe failure. We wish you many safe and enjoyable flights with your PERCIVAL MEW GULL .