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70cc Muscle Bipe ARF
Assembly Manual
Copyright 2021

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Summary of Contents for Extreme Flight Muscle Bipe ARF

  • Page 1 70cc Muscle Bipe ARF Assembly Manual Copyright 2021...
  • Page 2 If you are not willing to accept ALL liability for the use of this product, please return it to the place of purchase immediately. Extreme Flight RC, Ltd. guarantees this kit to be free of defects in materials and workmanship for a period of 30 DAYS from the date of purchase.
  • Page 3 Congratulations on your purchase of the Legacy Aviation 70cc Muscle Bipe! Inspired by the highly modified Waco known as the Mystery Ship, flown by the late air show legend Jimmy Franklin, the Muscle Bipe delivers timeless and classic looks coupled with modern features and performance. Equally at home flying barnstormer airshow maneuvers as it is flying old school low and slow 3D, the Muscle Bipe's gentle manners inspire confidence for sport flyers and 3D enthusiasts alike.
  • Page 4 Tips for Success: 1. We are very pleased with the level of craftsmanship displayed by the builders in our factory. Through hundreds of grueling test flights containing maneuvers that no aircraft should be subjected to, our prototypes have remained rigid and completely airworthy. Having said that, it is impossible for us to inspect every glue joint in the aircraft.
  • Page 5 5. Use a high quality epoxy for installing the composite control horns. We highly recommend the use of Pacer Z-Poxy 30 minute formula. We have used this glue for many years with zero failures. More recently we have started using the Loctite brand of Hysol epoxies and have grown to prefer them for their ease of application and clean up.
  • Page 6 Let's get started! 1. When assembling one of our current aircraft, I like to go ahead and get all of the control horns glued into the control surfaces. I start by lightly scuffing both sides of the shanks of each control horn that will be glued into the surface. A sanding block with medium grit sandpaper is ideal for this task.
  • Page 8 3. Test fit the control horns and baseplate into the surface and make sure everything fits properly. Use a high quality epoxy to glue the horns into the surfaces. I've started using the Loctite Hysol products and glue gun which makes this process so much faster with less clean up required and less waste.
  • Page 10 Please note: If using a twin 70-76cc gas engine or electric setup it is absolutely essential to use a pull-pull rudder system to achieve proper CG. This will require that you glue a set of control horns to each side of the rudder to interface with the pull-pull system cables.
  • Page 12 5. Next we'll install servos into the elevators and ailerons and assemble the linkages as shown in the pictures. We use the Extreme Flight Xcessories black socket head servo screws to affix the servos to the airframe (link below).
  • Page 14 6. Next let's get the landing gear mounted. There are pre-installed nylon insert locking nuts in the landing gear mount, making it very fast and easy to install the main landing gear. Attach the carbon fiber landing gear using 4 4mm socket head cap bolts, inserted through washers, through the gear and into the locking nuts.
  • Page 15 7. Slide the landing gear fairings into place and mark the landing gear with a felt tip marker to show where they fit. Remove the cuffs and lightly scuff the carbon gear for maximum glue adhesion. Use epoxy or "Goop" silicon adhesive to permanently attach the fairings to the gear.
  • Page 16 9. Attach the aluminum wheel pant bracket to the wood spacer with the included black wood screws. Retain the wheel with the bracket assembly as shown. Be sure to use Blue Loctite on the grub screw.
  • Page 17 10. Slide the wheel pant into position and secure with 2 3mm socket head cap bolts, inserted through a washer, the carbon gear and into the blind nuts in the wheel pant. Again, use Blue Loctite on these bolts and tighten securely. 11.
  • Page 18 12. Drill a hole in the bottom of the rudder to accept the ball link included in the tailwheel assembly package. Scuff the shank of the ball link with sandpaper and glue it into the hole with epoxy or medium CA. Slide the tailwheel tiller arm into the hole in the ball link and bolt the assembly to the bottom of the fuselage.
  • Page 20 14. After mounting your engine, install your ignition module or ESC. For those using a 70-76cc gas engine, install your ignition module as far forward as possible on the motor box top. If using the FG90-R3 radial engine, mount your ignition module inside the motor box directly behind the engine, in front of the gas tank.
  • Page 23 16. Before installing your tank and plumbing, slide the 4 cabane struts into position as shown and secure with 2 3mm socket head cap bolts per strut. Again, apply Blue Loctite to all bolts. 17. Mount a 24 ounce Flowmaster gas tank on the tank tray and run your fuel line (carb feed, fill tube, overflow).
  • Page 24 18. Insert 2 24" Extreme Flight 20AWG servo extensions into the center wing section and secure it to the cabane struts with 4 4mm socket head cap bolts. Secure the servo extension to the struts with a nylon cable tie or Velcro wrap.
  • Page 25 the crimp tube and cable. Repeat this for the other 3 cable ends and install onto the servo arm and control horns using the provided 3mm hardware.
  • Page 27 20. Trial fit the strut mounting brackets into the wings, making sure they seat properly against the wing surface. It is best to trial fit the wings at this time to insure proper alignment before permanently gluing the brackets into place with epoxy.
  • Page 28 21. For those of you assembling the radial version of the Muscle Bipe, installing the engine baffle will probably be the most time consuming step in the assembly process. Start by installing the cowl over the mounted engine. The baffle should fit 1/4" to 1/2" behind the front of the cylinders. I find it a huge help to determine the location of the baffle and measure forward from the rear of the cowl, making several marks around the interior circumference of the cowl with a felt tip marker where the baffle ring will be glued.
  • Page 31 22. Make an opening in the bottom of the cowl to allow incoming air to exit. Below is a picture of the cutouts I made on the bottom for the gas twin engine version for the exhaust stacks and air exit. I made a similar opening on the radial version.
  • Page 32 24. The quick mount/release components make assembling and disassembling your Muscle Bipe very fast at the flying field. Start by sliding the stab tube and anti-rotation rod into the fuselage and make sure the silver knob is in the rear position. Now slide both stabs onto the tube and connect the servo lead to the extension in the fuselage.
  • Page 33 25. Slide the wing tubes into the fuselage and center wing section. Open the latches in the fuselage and bottom of the upper center section. There is a rod spring in the lower wing latch that must be depressed for the latch to open. This can be done with the tip of your finger or a small flat blade screw driver.
  • Page 35 26. Place the outer wing struts into position and secure by sliding a retention pin into place for both the top and bottom of the strut.
  • Page 36 27. The forward hatch is installed by laying it on the forward fuselage top, making sure the bolts on the bottom fit into the keyhole shaped openings, then pushing the hatch forward until it mates with the F1 former. To install the canopy, open the carbon fiber hatch latches on each side of the fuselage, place the canopy into position.
  • Page 37 This completes the basic assembly of the Muscle Bipe. Please take time to double check your work, tie up any loose extensions, tighten any covering that has loosened and give your new bird a good polish with some spray-on detailing wax to enhance the luster of the paint and Ultracote covering and protect it from sun exposure and gas/oil mix.
  • Page 38 Rudder Low: 20 deg 50-60% exponential High: 45+ deg 60-80% exponential Thank you so much for your business and I sincerely hope your Muscle Bipe provides you with many seasons of flying fun! See ya at the flying field! Chris Hinson President Extreme Flight...