E-FLITE J-3 Cub 25 ARF Assembly Manual
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E-FLITE J-3 Cub 25 ARF Assembly Manual

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J-3 Cub 25 ARF
Assembly Manual

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Summary of Contents for E-FLITE J-3 Cub 25 ARF

  • Page 1 J-3 Cub 25 ARF Assembly Manual...

  • Page 2: Table Of Contents

    25-size J-3 Cub from E-flite is the first of its size for ™ Required.Electronics.&.Accessories........4 E-flite. The name Piper J-3 Cub .25 ARF implies the power Outrunner.(Direct.Drive).Motor.Setup......4 of a .25 glow engine, but it is designed specifically for Required.Tools.and.Adhesives........4 electric operation. This aircraft has been designed from Optional.Accessories...........5...

  • Page 3: Contents.of.kit/Parts.layout

    Specifications Covering Colors Wingspan: 62 in (1575mm) Cub Yellow HANU884 Length: 35.5 in (900mm) Black HANU874 Wing Area: 552 sq in (35.5 sq dm) Weight w/o Battery: 3.2 lb (1.45 kg) 4.5 lb w/Floats (2.0 kg) Weight w/Battery: 4 lb (1.8 kg) 5.3 lb w/Floats (2.4 kg) Contents of Kit/Parts Layout Large Replacement Parts:...

  • Page 4: Required.electronics.&.Accessories

    Required Electronics & Accessories Required Tools and Adhesives Complete Radio System Tools JSP16000** JR SPORT 6-Channel Radio System Small Phillips Screwdriver ™ (EFLA257 - included with EFLA250) Or Purchase Separately Hex Wrench: 7/64" JSP30600 RS600 6-Channel Receiver w/o Crystal (EFLA251 - included with EFLA250) JRPXFR** FM Receiver Crystal JSP20040...

  • Page 5: Optional.accessories

    Note on Lithium Polymer Batteries Optional Accessories EFLA110 Power Meter Lithium Polymer batteries are significantly EFLA500 Float Set, 25-Size more volatile than alkaline or Ni-Cd/ Ni-MH batteries used in RC applications. Warning All manufacturer’s instructions and warnings must be followed closely. Mishandling of An RC aircraft is not a toy! If misused, it can cause Li-Po batteries can result in fire.

  • Page 6: Safety Precautions

    Limited Warranty & Limits of Liability As Horizon Hobby, Inc. has no control over use, setup, final assembly, modification or misuse, no Pursuant to this Limited Warranty, Horizon Hobby, Inc. liability shall be assumed nor accepted for any will, at its option, (i) repair or (ii) replace, any product resulting damage or injury.

  • Page 7: Inspection Or Repairs

    Questions, Assistance, and Repairs Inspection or Repairs Your local hobby store and/or place of purchase cannot If your product needs to be inspected or repaired, please provide warranty support or repair. Once assembly, call for a Return Merchandise Authorization (RMA). Pack setup or use of the product has been started, you must the product securely using a shipping carton.

  • Page 8: Landing.gear.installation

    Non-Warranty Repairs Landing Gear Installation Should your repair not be covered by warranty and the Required Parts expense exceeds 50% of the retail purchase cost, you will • Fuselage • Landing gear be provided with an estimate advising you of your options. •...
  • Page 9    1. Place the landing gear in position with the larger 2. Slide the inner wheel hub onto the landing diameter wire to the front of the fuselage. Secure gear. (The holes in the inner hub do not go the gear using four landing gear straps and eight through the hub.) Slide a 4mm wheel collar onto 2mm x 10mm sheet metal screws.
  • Page 10     3. Press the 2 " (63mm) foam wheel onto 4. Press the hub cap into the outer wheel hub. the inner hub. Press the outer wheel hub into the wheel. Complete the assembly using four 2mm x 15mm sheet metal screws.
  • Page 11   5. Attach the landing gear fairing to the landing gear using three tie straps. Trim the excess strap side cutters.  6. Repeat Steps 2 through 5 to complete the landing gear installation.

  • Page 12: Motor.and.cowling.installation

    Motor and Cowling Installation  1. Prepare the outrunner motor by attaching the X-mount to the motor using screws supplied with Required Parts the motor. • Fuselage • Cowling • Hook and loop straps (2) • 6-32 x 1/2" socket head screw (4) •...
  • Page 13 3. Attach the motor to the speed control. Secure 6-32 x 1/2" socket head screws included with the speed control in the fuselage using hook and the J-3 Cub. loop material so it will not move during flight. Note:.The.firewall.has.been.prepared.to.mount. Note:.Ensure.you.mount.the.speed.control.with. the.E-flite™.Power.25.brushless.motor..It.may. the.label.towards.the.fuselage.sidewall..This. be.necessary.to.remove.the.blind.nuts.and.drill. will.assure.maximum.cooling.for.the.speed. new.mounting.holes.for.other.motor.choices. control.
  • Page 14   5. Slide the cowling onto the fuselage. Place the 4. Use hook and loop material to secure the battery propeller adapter onto the motor and attach the into the fuselage. propeller using the adapter. Note:.Now.would.be.a.good.time.to.plug.the. speed.control.into.the.receiver.and.check.the. operation.of.the.motor..It.should.rotate.counter- clockwise.when.viewed.from.the.front.of.the. fuselage..Once.the.operation.of.the.motor.has.
  • Page 15  6. Position the cowling so it lines up with the propeller and adapter. Allow for 1/8” (3mm) clearance between the propeller and cowl. Drill four 1/16" (1.5mm) holes for the cowl mounting screws. Enlarge the holes in the cowling only using a 1/8"...

  • Page 16: Radio.installation

    Radio Installation Note:.The.servo.openings.in.the.fuselage.are. set.up.for.the.JR.SPORT .(MN48).Mini.Servos. ® Required Parts • Fuselage  2. Center the servo in the servo opening. Use a • Receiver • Mini Servo (2) 1/16" (1.5mm) drill bit to drill the locations for • 6" Y-harness the servo mounting screws. Required Tools and Adhesives •...
  • Page 17   4. Plug the rudder, elevator and speed control into 3. Secure the servo using the screws provided with the receiver, as well as the aileron Y-harness. the servo. Repeat Step 2 for the remaining servo. Use hook and loop to secure the receiver in the fuselage.

  • Page 18: Wing.assembly

    Wing Assembly   1. Place a T-pin in the center of three hinges. Required Parts • Clevis (2) • Clevis retainer (2) • Pushrod wire keeper (2) • CA hinge (6) • Mini Servo (2) • 6" servo extension(2) •...
  • Page 19     2. Drill a 1/16" (1.5mm) hole in the hinge 3. Place the hinges in the aileron. center of both the aileron and wing.
  • Page 20     5. Deflect the aileron and apply thin CA to 4. Slide the aileron and wing together. Remove each of the hinges. Make sure to saturate each the T-pins. There should be a 1/64" (.4mm) gap hinge. Apply CA to both the top and bottom between the aileron and wing.
  • Page 21     6. Install the grommets and brass eyelets 7. Check to make sure you are using the correct into the aileron servo. Attach a 6" (152mm) servo hatch for the wing panel. Simply place the servo extension, securing it with thread or a hatch in position to make sure the opening for the commercially available clip.
  • Page 22     8. Position the servo onto the servo hatch with 9. Use 6-minute epoxy to glue two 3/4" x 3/8" the servo arm centered in the slot. Use a felt- x 3/8" (19mm x 10mm x 10mm) servo blocks tipped pen to mark the locations for the servo to the servo hatch.
  • Page 23     10. Place the servo into position between the 11. Use a 1/16" (1.5mm) drill bit to drill the mounting blocks. Mark the location for the servo holes in the servo mounting blocks for the screws. mounting screws using a felt-tipped pen. Secure the servo using the screws provided with the servo.
  • Page 24     12. Pass the servo lead from the servo opening 13. Secure the servo hatch to the wing using to the hole in the root of the wing. four 2mm x 10mm sheet metal screws. Note:.A.weight.tied.to.a.string.can.be.. used.first,.then.tied.to.the.servo.lead.to.. pull.it.through.
  • Page 25     14. Slide a clevis retainer onto a clevis, 15. Remove the backplate from a control horn. then thread the clevis onto a 4" (100mm) Snap the clevis to the horn and position the horn linkage wire. Thread the clevis on at least so the holes are aligned with the hinge line and 12 turns to start.
  • Page 26     17. Attach the control horn using two 2mm x 16. Use a 5/64" (2mm) drill bit to drill the 20mm screws and the control horn backplate. locations for the control horn screws.
  • Page 27 Note:.Turn.on.the.transmitter.and.verify.all.trims.   19. Bend the pushrod wire 90 degrees at the and.sub-trims.are.centered..Next,.plug.in.the. mark made in the last step. Drill a 5/64" (2mm) aileron.servo.and.verify.it.is.centered.for.the. hole in the servo arm and pass the wire through following.steps. the hole. Secure the wire using a pushrod wire keeper.
  • Page 28   21. Apply a thin coat of 6-minute epoxy to one side 22. Once the epoxy has had time to cure, sand any of a wing joiner. Use clamps to hold a second excess epoxy from the joiner. Test fit the joiner joiner to the first until the epoxy fully cures.
  • Page 29   23. Fit the two wing panels together using the 24. Mix up 1/2 oz (15ml) of 30-minute epoxy. joiner. The panels must fit together with no gaps. Apply epoxy to both the wing joiner and the Sand if necessary for a perfect fit. joiner opening of both wing panels.

  • Page 30: Tail.installation

    Tail Installation  25. Use a covering iron to apply the covering to the center of the wing over the joint. Required Parts • Fuselage • Assembled wing • 8-32 x 1 " screw (2) • #8 washer (2) • Stabilizer w/elevators •...
  • Page 31 Note:.It.may.be.necessary.to.lightly.sand..  3. Check that the wing and stabilizer are parallel. the.tab.at.the.front.of.the.wing.to.get.the.. Lightly sand the opening in the fuselage if wing.to.fit. adjustments are required.  2. Slide the stabilizer into the slot at the rear of the fuselage. Center the stabilizer as shown.
  • Page 32   4. Measure from each tip of the stabilizer to a point 5. Once the stabilizer has been carefully aligned, at the forward center of the fuselage. Adjust the use a felt-tipped pen to trace the outline of the stabilizer so both measurements are equal.
  • Page 33   6. Mark the stabilizer so you know which is top and 7. Slide the stabilizer partially into the fuselage. bottom. Remove the stabilizer and use a hobby Apply a thin layer of 6-minute epoxy onto the knife with a new blade to cut the covering 1/16" exposed wood of the stabilizer, both top and (1.5mm) inside the lines drawn in the last step.

  • Page 34: Linkage.installation

    Linkage Installation  8. Attaching the fin is basically the same as installing the stabilizer, except for checking that Required Parts the fin is perpendicular to the stabilizer using • Fuselage • 4mm wheel collar (2) a square. Remember to mark and remove the •...
  • Page 35   1. Locate the tail wheel assembly and apply 2. Use 6-minute epoxy to glue the nylon mount petroleum jelly to the wire above and below into the fuselage. the nylon mount. This helps prevent epoxy from binding the tail gear.
  • Page 36   3. Drill a 3/32" (2.5mm) hole into the rudder 4. Cut a slot from the hole to the bottom of the " (27mm) up from the bottom of the rudder. rudder. The slot will house the nylon mount when Verify this measurement by holding the rudder in the rudder is installed.
  • Page 37   5. Attach the tail wheel using the 2mm wheel collar 6. Slide a clevis retainer onto a clevis, then thread and the 3mm setscrew. the clevis onto a 25 " (650mm) pushrod wire. Slide the pushrod wire into the opening as shown. ...
  • Page 38   8. Remove the backplate from a control horn. 9. Remove the rudder and drill the two locations Snap the clevis onto the control horn, and using a 5/64" (2mm) drill. Mount the horn hold it against the rudder and mark the using two 2mm x 12mm screws and the location for the horn.
  • Page 39   11. Remove the T-pins from the hinges and use thin 12. Snap the clevis onto the control horn and use CA to glue them in place. Allow the epoxy and tape to hold the rudder centered. Mark the CA to cure before continuing to the next step.
  • Page 40    13. Bend the wire at the mark. Drill a 5/64" 14. Prepare three CA hinges using T-pins. Use (2mm) hole in the servo arm and secure the hinges to temporarily attach an elevator the pushrod wire using a pushrod wire half to the stabilizer, using NO GLUE.
  • Page 41    15. Drill the holes for the control horn in 17. Prepare two wheel collars by threading the elevator. Attach the control horn using two 3mm x 6mm screws into them. Slide the wheel 2mm x 12mm screws. collars onto the elevator pushrod.
  • Page 42   18. Center the elevator and mark the pushrod. Bend 19. Repeat Step 14 through 16 to attach the the pushrod and attach it to the elevator servo remaining elevator half. Pass the pushrod arm using a pushrod wire keeper. Trim the through the wheel collars when installing elevator servo arm as shown in the photo.
  • Page 43  Note:.Once.set,.coat.the.wheel.collars.and.wire. 20. Use a ruler to make sure both elevator halves with.6-minute.epoxy. are centered. Once centered, tighten the screws in the wheel collars. Remember to use threadlock on those screws.

  • Page 44: Final.assembly

    Final Assembly  2. Lightly sand the fuselage inside the line drawn in the last step. Also sand the inside edge of the Required Parts windshield where it will attach to the fuselage. • Fuselage • Wing • Front windshield •...
  • Page 45   3. Apply a thin bead of canopy glue around the 4. Use hobby scissors to trim out the side windows. outer edge of the front windshield. Position the Trim the windows so there is a 1/16" (1.5mm) lip windshield on the fuselage and use tape to hold it to glue the windows to the fuselage sides.
  • Page 46  5. After sanding the edges of the windows, use canopy glue to secure them to the inside of the fuselage. Use tape to hold them in position until the glue fully cures.   6. Attach the wing to the fuselage. Place the struts so the arrow on the strut is facing up and is pointing towards the front of the plane.

  • Page 47: Center.of.gravity./.Battery.installation

    Center of Gravity / Battery Installation An important part of preparing the aircraft for flight is properly balancing the model. Caution: Do not inadvertently skip this step! The recommended Center of Gravity (CG) location for the J-3 Cub is 2 "...

  • Page 48: Control.throws

    Control Throws Exponential Settings High Rate Low Rate The amount of control throw should be adjusted as closely as possible using mechanical means, rather than making Aileron. 20%. large changes electronically at the radio. By moving the Elevator. 20%. position of the clevis at the control horn toward the outermost hole, you will decrease the amount of control throw of the Rudder.

  • Page 49: Flying.notes

    Flying Notes Flying the J-3 Cub is a pleasure. Takeoffs are easy as well as When flying from floats there are a few flight parameters landings. Loops and rolls are as easy as pushing the control to be aware of. Because of the inertia generated below stick in the desired direction with the control throws listed in the centerline, the aircraft can depart during certain the manual.

  • Page 50: 2006 Official Ama National Model Aircraft Safety Code

    2006 Official AMA National Model Aircraft Safety Code GENERAL 5) I will not fly my model unless it is identified with my name and address or AMA number on or in the 1) I will not fly my model aircraft in sanctioned events, model.

  • Page 51: Official Ama National Model Aircraft Safety Code

    2006 Official AMA National Model Aircraft Safety Code 3) At all flying sites a straight or curved line(s) must Documents of agreement and reports may exist be established in front of which all flying takes place between (1) two or more AMA Chartered Clubs, with the other side for spectators.
  • Page 52 © 2006 Horizon Hobby, Inc. 4105 Fieldstone Road Champaign, Illinois 61822 (877) 504-0233 www.horizonhobby.com www.E-fliteRC.com 829...

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