Seagull Models L-4 Grasshopper 90 inches, Assembly Manual

Page 1: ...ications Wingspan 90 0 in 228 6 cm Wing area 1182 3 sq ins 76 3 sq dm Weight 13 2 lbs 6 0 kg Length 56 8 in 144 2 cm Engine Motor size 20cc gasoline Radio 4 channels with 5 servos ASSEMBLY MANUAL Code SEA 325 ...

Page 2: ...nstruction manual is designed to help you build a great lying aeroplane Please read this manual throughly before starting assembly of your L 4 Grasshopper 90 inches Use the parts listing below to indentify all parts 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 R...

Page 3: ...urfaces including the ailer ons 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 us ing a high quality thin C A glue Carefully remove the aileron from one of the wing panels Note the position of the hinges Remove each hinge from the wing panel and aileron and place ...

Page 4: ...he 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 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 Repeat this process with the other wing panel securely hinging the aileron in place Ater both ailerons are se...

Page 5: ...may need to adjust the size of the precut opening in the mount he notch in the sides of the mount allow the servo lead to pass through Minimum servo spec Torque 80 oz in 5 8 kg cm 4 8V 100 oz in 7 2 kg cm 6 0V Place the servo between the mounting blocks and space it from the hatch Use a pencil to mark the mounting hole loca tions on the blocks ...

Page 6: ...sing Phillips screwdriver and the screws provided with the servo Apply 1 2 drops of thin C A to each of the mounting tabs Allow the C A to cure without using accelerator Apply 2 3 drops of thin C A to each of the mounting holes Allow the C A to cure without using accelerator 1 5mm C A glue Remove the string from the wing at the servo location and use the tape to attach it to the servo extension le...

Page 7: ... servos with the screws pro vided with your radio system INSTALLING THE FUSELAGE SERVOS Because the size of servos difer you may need to adjust the size of the precut opening in the mount he notch in the sides of the mount allow the servo lead to pass through Install the rubber grommets and brass collets into all servos Test it the servos into the fuselage servo mounts 105mm 3x10mm ...

Page 8: ...NSTALLING THE RECEIVER SWITCH Install the switch into the precut hole in the side in the fuselage 3 32 Hole Switch INSTALLING THE ENGINE SWITCH Trim and cut Trim and cut hrottle servo arm Rudder servo hrottle servo Rudder servo arm Elevator servo Elevator servo arm ...

Page 9: ...9 2 INSTALLING LANDING GEAR Locate items necessary to install Sprin Landing Gear Switch 1 2 3 4 5 6 7 1 4 inch 6mm ...

Page 10: ...L 4 Grasshopper 90 inches Instruction Manual 10 12 13 14 15 8 9 10 11 Epoxy ...

Page 11: ...11 20 21 22 23 16 17 18 19 Epoxy Epoxy ...

Page 12: ...L 4 Grasshopper 90 inches Instruction Manual 12 28 29 30 31 25 26 27 24 3x15mm 3x15mm ...

Page 13: ...13 36 37 38 39 32 33 34 35 3x15mm 3x15mm 3x12mm ...

Page 14: ... 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 Carefully bend the second nylon tube up at a 45º angle his tube is the vent tube Test it the stopper assembly into the tank It may be necessary to remove some of the lashing around the tank opening using a modeling knife If lashing is present make...

Page 15: ...ine which is which Use balsa block to hold in place the fuel tank with C A glue to secure the fuel tank Use balsa block to hold in place the fuel tank with C A glue to secure the fuel tank inside the fuselage Connect the lines from the tank to the engine and muler he vent line will connect to the muler and the line from the clunk tothe carburetor Fuel pick up tube Fuel ill tube Ven tube With the s...

Page 16: ...hem from vibrating loose hread locker glue MOUNTING THE ENGINE Positiontheenginewiththedrivewasher 140mm forward of the iewallas shown 140mm Use a pin drill and 4mm drill bit to drill a small indentation in the mount for the engine mounting screw 4mm Use a drill to drill the four holes in the engine mount rails 1 2 3 ENGINE MOUNT INSTALLATION Locate the items necessary to install the engine mount ...

Page 17: ...stall the servo horn perpendiular to the servo center line Move the throttle stick to the closed po sition and move the carburetor to closed Use a 2 5mm hex wrench to tighten the screw that secures the throttle pushrod wire Make sure to use threadlock on the screw so it does not vibrate loose COWLING Please see below pictures 4 8 9 1 5 6 7 ...

Page 18: ...L 4 Grasshopper 90 inches Instruction Manual 18 3 2 4 5 8 9 6 7 ...

Page 19: ...19 11 15 10 14 12 16 13 17 ...

Page 20: ...uction Manual 20 19 18 20 21 24 22 23 Use a drill and drill bit to drill the holes for the cowl mounting screws Make sure the cowl position is correct before drill ing each hole Tape the cowl to the fuselage using low tack tape Epoxy ...

Page 21: ... be nec essary to use a needle valve extension for the high speed needle valve Make this out of suf icient 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 3x10mm ...

Page 22: ... 19x10 ESC 85A 6S 8S Lipo Attach the electric motor box to the ire wall suitable with the cross lines drawn on the electric motor box and irewall Using epoxy and balsa stick to secure the motor box to the irewall Please see pic tures below Attach the motor to the front of the electric motor box using four 4mm blind nut four M4x25mm hex head bolts to se cure the motor Please see picture shown hen u...

Page 23: ...e motor box using two sided tape and tie wraps Connect the appropriate leads from the speed control to the mo tor Make sure the leads will not interfere with the operation of the motor Battery M4x20mm Balsa stick Epoxy Speed control 7 8 9 10 14 13 12 11 Epoxy 3mm ...

Page 24: ...zer Measure from the tip of the stabilizer to the wing Position the stabilizer so both measurements are equal Cowling has not been installed at this time he 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 propel ler comes in contact with it 15 16 2 1 2 17 1 ELEVATOR AND STABILIZER INSTALLATION M6x30mm ...

Page 25: ...se lage noting the position from the previ ous step his will guarantee the joiner is placed correctly so the elevators will be oriented as prepared in the previous step Use a ruler and carefully cut the cover ing 1 8 inch 3mm inside the line drawn on the stabilizer to remove the covering from the center of the stabilizer Remove the top and bottom covering Use care not to cut into the underlying wo...

Page 26: ...in both the ele vators and stabilizer surfaces at this time Place a T pin in the center of each hinge along side the slot in the hinge his will help center the hinge when it is placed in the elevators Slide the hinges into posi tion with the T pin resting against the edge of the control surface Fit the elevator into position on the sta bilizer Guide the joiner wire and hinges into position Slide t...

Page 27: ... stabilizer Make sure the pack ing material is cut so it does not obstruct the hinge slot Use a small piece of low tack tape to hold the packing material in position he clear packing material is used to prevent accidentally gluing the elevator or joiner wire to the stabilizer Mix a small amount of 15 minute epoxy Use a toothpick to apply epoxy to the joiner wire Use a toothpick to apply epoxy to t...

Page 28: ...ng sure to keep the gap between the elevator and stabilizer as narrow as possible Saturate each of the hinges using thin CA Apply CA to the bottom of the hinges Allow the CA to cure before proceeding Gently pull on the fixed and moving surface to make sure the hinges are glued securely If not reapply thin CA to any hinges that are found loose Check the alignment of the elevators in relationship to ...

Page 29: ...d 1 16 inch 1 5mm drill bit to drill a hole in the center of each hinge slot his allows the CA to wick into the hinge Drill holes in both the rudder and fin surfaces at this time Place a T pin in the center of thehinge Slide the hinges into position with the T pin resting against the edge of the control surface Check the fit of the rudder to the fuse lage Make sure the tail wheel wire fits into the r...

Page 30: ...l horn using the same method as with the aileron con trol horns Position the elevator control horn on the both side of elevator hread one clevis and M2 lock nut on to each elevator control rod hread the horns on until they are lush with the ends of the control rods Elevator and rudder pushrods assembly as pictures below 2 760mm Epoxy Epoxy ...

Page 31: ... 1 2 3 4 1 790mm RUDDER PUSHROD INSTALLATION Repeat steps as same as steps done for elevator MOUNTING THE TAIL WHEEL Locate items necessary to install tail wheel M2 clevis Elevator pushrod Fuel tubing Hex nut ...

Page 32: ...L 4 Grasshopper 90 inches Instruction Manual 32 2mm C A glue 3x10mm M3x15mm 2 3 4 5 6 7 8 9 ...

Page 33: ...33 INSTALL BRACING WIRE AND METAL BRACKET AT THE TAIL TOP VIEW 3x15mm 10 14 1 2 3 11 12 13 ...

Page 34: ...L 4 Grasshopper 90 inches Instruction Manual 34 3x15mm 4 5 6 7 9 8 10 11 ...

Page 35: ...35 BOTTOM VIEW 15 16 17 12 13 14 19 18 ...

Page 36: ...L 4 Grasshopper 90 inches Instruction Manual 36 SIDE DOOR INSTALLTION Please see below pictures 20 21 1 2 2x6mm 3 4 5 6 ...

Page 37: ...37 INSTALL WINDSHIELD OF THE SIDE DOOR Please see below pictures 7 1 2 3 4 5 6 7 Epoxy ...

Page 38: ...L 4 Grasshopper 90 inches Instruction Manual 38 8 9 10 11 Epoxy Epoxy 12 13 14 15 ...

Page 39: ...39 INSTALLATION PILOT AND CANOPY Locate items necessary to install pilot and canopy 1 2 3 4 Epoxy Epoxy Epoxy 5 6 7 8 ...

Page 40: ...er 90 inches Instruction Manual 40 INSTALLING BATTERIES AND LEDS 9 1 2 3 Please see below pictures Lamp voltage 12v use appropriate bat tery 4 5 1 2 Epoxy INSTALLING NEEDED ANTEN Parts requirement See pictures below ...

Page 41: ...R Plug the servos leads and the switch lead into the receiver Plug the battery pack lead into the switch also Wrap the receiver and battery pack in the protective foam rubber to protect them from vibration Two batteries Receiver 3 4 5 6 ...

Page 42: ...L 4 Grasshopper 90 inches Instruction Manual 42 7 8 9 1 3x10mm INSTALLATION WING STRUTS Loacte the items for this section of the manual 2 3 4 5 3x15mm ...

Page 43: ...43 6 7 8 9 10 11 12 13 M3x15mm Socket Head Cap Screw Diagonal brace Nylon washer Nylon washer M3 locknut Front ...

Page 44: ...L 4 Grasshopper 90 inches Instruction Manual 44 14 15 16 17 1 1 1 2 100mm 18 19 20 21 2 86mm ...

Page 45: ...45 22 23 1 2 ATTACHMENT WING FUSELAGE Attach the aluminium tube into fuselage Wing tube 3 4 5 6 Wing bolt 3x12mm ...

Page 46: ...d ready to stick Please be certain the model is clean and free from oily ingerprints and dust Position decal on the model where de sired using the photos on the box and aid in their location APPLY THE DECALS BALANCING It is critical that your airplane be balanced correctly Improper balance will cause your plane to lose control and crash THE CENTER OF GRAV ITY IS LOCATED 100MM BACK FROM THE LEADING...

Page 47: ...ed to the fuselage all parts of the model installed ready to ly and empty fuel tanks hold the mod el at the marked balance point with the stabilizer level If possible irst 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 ba...

Page 48: ...L 4 Grasshopper 90 inches Instruction Manual 48 20 30mm 30 40mm 20 30mm 20 30mm 20 30mm 30 40mm Wing Fuselage ...

Page 49: ...ler on should move up and the other aileron should move down If it does not lip the servo reversing switch on your transmit ter to change the direction 1 Completely charge your transmit ter and receiver batteries before your irst day of lying 2 Check every bolt and every glue joint in the L 4 Grasshopper 90 inches to ensure that everything is tight and well bonded 3 Double check the balance of the...

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