PIPER J-3 Cub - Ripmax - Radio Control Model J-3 Cub GP/EP 1 Contents of Kit/Parts Layout Tools and

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Text of PIPER J-3 Cub - Ripmax - Radio Control Model J-3 Cub GP/EP 1 Contents of Kit/Parts Layout Tools and

  • MTH HOBBY PRODUCTS INDUSTRIAL CO., LTD.www.mth.com.tw mthhobby@mth.com.tw

    MTH HOBBY 2014


    2WING AREA:42dmWEIGHT:2300-2600g RADIO:4 CHANNELS ENGINE: .46(2C) .56(4C)

    WarningAn RC aircraft is not a toy! If misused, it can cause serious bodilyharm and damage to property. Fly only in open areas, following allinstructions included with your radio.Before beginning the assembly, remove each part from its bag forinspection. Closely inspect the fuselage, wing panels, rudder andstabilizer for damage. If you find any damaged or missing parts,contact the place of purchase.





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    PIPER J-3Cub


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    Contents of Kit/Parts Layout

    Tools and suppliers needed (not included in kit):Phillips screws driver #0/#1 / Curved scissorsHex wrench 1.5/2mm/2.5mm/6mm / Hobby knife / Ruler / Iron / Cross wrenchPliers / Z-bender / Sanding paper / Epoxy 5-10 minutes / Marker / CA glue UHU foam glue / Superglue / Cross wrench / Reamer / Solder IronThread lock / Side Cutter / Driller 2mm/6mm / Transparent Tape / Pin3M fiber tape

    Hobby knifeReamerSanding paperIronRulerMarker


    Recommended radio and equipment (not included in kit):4 channels radio x 1 pieceReceiver x 1 piece45g servo x 4 pieces 30cm extension x 1 piecesSwitch x 1 pieceEngine: 46(2C)c~56(4C)Aluminum spinner (for Gas engine)4.8V battery

    Contents of Kit / Parts Layout

    For EP:Motor: 500~680KVBattery: 2200~3000mAh 4-cell Li-PoESC: 50-60APropeller: 11x6" ~12x6"Aluminum spinner (for EP flying)

    Place the main wing and hinges onthe working table.

    Bend the hinges several times.Spread the Super glue on the hingesand insert into the hinges slot on themain wing and aileron. Apply thetape to hole the aileron in positiontemporary until the glue dry enough.

    Try to fit the wing joiner into the mainwing. If too tight, use sand paper totrim the wing joiner. When satisfy theassembly, use pencil to mark thelocation of the servo try.

    Mix 10-min epoxy and spreadgenerous amount of epoxy on thewing joiner. Fit the wing joiner intothe main wing. Apply tape on theconjunction temporary until theepoxy dry enough.

    Take the main wing front planking out of the wooden hardware bag. Spreadepoxy on the planking and secure onthe main wing.

    Place the main wing servo tray on theworking table. Use epoxy to securetwo sides of planking on the tray.

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    Place the servo tray on the center ofthe main wing set. Use marker to mark the location of the servo tray onthe main wing.

    Use hobby knife to remove thecovering over the hole.

    Use epoxy to secure the servo tray inposition.

    Place the servo on the servo tray andsecure it in place with the screws come with the servo.

    Take two pieces of 330mm rods outof the hardware bag. Use side cutterto cut all the parts out of the plasticparts tree. Screw a clevis onto thethreaded end of each rod. Thread theaileron horns onto the aileron torquerods in the wing until the rod is flushwith the aileron horn. Attach theclevises onto their respective aileronhorns. Center the aileron servo andusing marker to place a mark on theunthreaded end of the aileronpushrods where they pass theirrespective servo arm.

    Using z-bend pliers, make a z-bend at the marked location on each rodand cut off the excess rod.

    Use 2mm reamer to enlarge the holeon the servo arm. Place a piece offuel tubing over the clevises.This will provide extra insuranceagainst the clevises accidentallycoming open. Install the z-end intothe hole of the servo arm. Adjust theaileron torque rod length by screwingin or out until the aileron is exactly inthe neutral position when the servo iscentered and clevis is in the aileronhorn. Adjust both sides.

    Find the pre-serving opening on bothsides of the fuselage for assemblingwindows. Use hobby knife to removethe covering over the openings.Please reserve 6mm covering on theedges of the openings.

    OUse iron (140 C) to trim the edgesand use hobby knife to remove theexcess covering.

    Place the window set on the workingtable and use curved scissors toremove window from the window set.Please reserve 6mm on the edges. Spread UHU glue along the edges of

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    Place the yellowing covering andmain gear planking on the workingtable. Iron on the covering onto themain gear planking.

    Iron on the covering onto the wingstruts and the triangle reinforcingplanking.

    Iron on the covering onto the frontedge of the main wing.

    Place the black covering, decorativemuffler and spring on the workingtable. Iron on the black covering ontothe muffler and spring. Please notethere is a hole on the center part ofthe spring. Use reamer to re-openthe hole after ironing.

    Find a long trip of yellow covering inthe hardware bag. Iron on theyellowing covering onto theconjunctions.

    Try to fit two struts together and usehobby to remove the covering on theconjunctions.

    Use epoxy to glue the struts togetherand use tape to secure the strutstemporary.

    Spread generous super glue on thehinges and insert the hinges into therudder until the hinge line is even withthe leading edge of the rudder. Placethe rudder onto the vertical stabilizer.

    Place the horizontal stabilizer on theworking table. Use ruler to mark thecenter line on the stabilizer. Place thefuselage on the stabilizer. The centerline of the fuselage must meet thecenter line on the stabilizer. Use 3

    pieces of needle to fix the stabilizeron the fuselage.

    Use a pencil to carefully trace aroundthe bottom and the top of thestabilizer where it meets the fuselage.Remove the fuselage.

    Use a straight ruler to mark the areainside the line.

    Using a hobby knife carefully cutaway the covering inside the linesmarked above. Be carefully not to cutinto the wood as doing so will weakenthe structure.

    window set and secure on thefuselage. Apply tape on the windowset for holding it in place until theglue is dry enough.


    0 m


    60.2 mm

    12 mm


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    Spread generous super glue on thehinges and insert the hinges into theelevator. Place the elevator onto thehorizontal stabilizer.

    Take 6mm dowels out of thehardware bag. Use sand paper tosand both ends for making 1mm 45degree angle.

    Place the main wing onto thefuselage and secure in place with4x40mm screws and washers. Use6mm driller to open the hole on theplanking, depth is around 15mm.

    Spread some epoxy on half of thedowel and insert into the main wing.

    Place the tail wheel and 2mm collaronto the tail gear and secure with3x5mm screw.

    Use ruler to mark a position on therudder. It is 35 mm from the bottom.

    Use a sharp hobby knife to open a Vslot (depth: 2mm) on the markedposition.

    Use 2mm driller to drill a hole on themarked location for accepting the tailwheel guide wire.

    Spread some epoxy into the hole forsecuring the tail wheel guide wireinside the rudder.

    Use hobby knife to remove thecovering on the bottom of the vertical.

    Apply some epoxy the vertical andhorizontal where they come incontact with the fuselage. Assemblethe vertical and horizontal on the

    There is a gap between vertical andhorizontal on both sides. Try to fit thetriangle reinforcement into the gap.Please note it must fit perfect. If not,use sand paper to trim the edges ofthe reinforcement. When satisfy thelocation, use pencil to mark theoutline on the vertical and horizontal.

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    Use 2.6x 10mm tapping screw tosecure the tail wheel assembly inlocation.

    Take dowels, clevis and heat shrinktubing out of the hardware bag. Takea rod of 5mm. Use plier to make a90 degree bend on no threaded end.Insert the 90 degree bend into the

    Hole of the wood dowel. Slide a pieceof heat shrink tubing over each endof the wood dowel and shrink it inplace using a heat gun.

    Carefully cut away the covering onthe top left side of the fuselage nextto the vertical fin for the rudder andthe right side for the elevator this iswhere the pushrods will exit. Positionthe assembled pushrods through thefuselage to the exit. Slide a piece offuel tubing and screw the clevis onthe end of the pushrod.

    Install the control horns on theelevator an rudder. When installingthe control horns, it is important thatthe holes in the control horns, wherethe pushrod attaches are directly in-line with the control surface hingeline. Use 2mm driller drill hole.Secure the control horns and plate inplace with 2 x 15mm screws.

    Using Z-bend pliers, make a Z-bendat the marked spot on the rod. Use2mm driller to open a hole on theservo arm. Insert Z-bend into servoarm and secure with screw. Slide thefuel tubing to the clevis.

    Take the motor mount planking out of

    Find two planking that has the sameshape. Use epoxy to glue themtogether. Use ruler to mark a crosson the planking.

    Assemble the planking into the motormount. Use epoxy to secure theplanking in place.

    Try to fit the motor on the motormount. Secure the motor cross plate(come with the motor) on the motorplanking with the screws come with

    Using a 90 degree triangle, makesure that fin is perpendicular to thehorizontal stabilizer.

    fuselage. Use needle or tape to holdthe vertical in place until it'scompletely dry.


    Install the servos on the servo trayand secure with the screws whichare included with the servo. Securethe servo tray with epoxy. Center theservo. Using marker to mark the rodwhere it passes the respective servoarm.



    165 150


    the hardware bag and place on theworking table.

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    Use epoxy to secure the m


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