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Mountain Models Switchback Sport Builder Manual

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Switchback Sport
Builder's Manual
Thank you for purchasing the Switchback Sport. The Switchback Sport has been designed for the novice
to intermediate pilot who wants a plane with good performance that will fly in a limited space. The
Switchback Sport can also accept the Switchback 3D wing, turning it into a highly aerobatic airplane.
January 31, 2002
Last revised March 24, 2003
Copyright ! 2002, 2003 Douglas Binder, Mountain Models
www.mountainmodels.com
(719) 592-1387
doug@mountainmodels.com
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Summary of Contents for Mountain Models Switchback Sport

  • Page 1 Switchback Sport Builder’s Manual Thank you for purchasing the Switchback Sport. The Switchback Sport has been designed for the novice to intermediate pilot who wants a plane with good performance that will fly in a limited space. The Switchback Sport can also accept the Switchback 3D wing, turning it into a highly aerobatic airplane.

  • Page 2: Required Equipment

    Required Equipment Xacto with #11 blades Thin and Thick CA – Cyanoacrylate glue (Super Glue) 5 minute epoxy Sanding block with 200 grit sandpaper Smooth, flat work table Wax paper to protect plans while gluing Needle nose pliers Wire cutters Hobby Iron for applying covering –...
  • Page 3 Switchback Assembly Stabilizers, Rudder, Elevator, and Aileron Assembly The tail assemblies and ailerons are made up from the 3/32” and 1/8” laser cut sheet. Lay the plans out on a flat worktable and tape them down, and then lay a sheet of wax paper over the plans. This will protect the plans from the glue.

  • Page 4: Wing Assembly

    ! Measure 5/8" from the bottom edge of the rudder and drill a 1/32” hole in the center of the leading edge. Gently push the tail wheel wire into the hole. Glue a piece of Tyvek material around the tail wheel wire where it enters the leading edge of the rudder. Wing Assembly ! Tape a sheet of wax paper over the plans to protect the plans and to prevent glue from sticking to them.
  • Page 5 ! Position the 1/8” trailing edge so that it is flush with the bottom of the ribs and that it is pushed as far forward as possible. The end that is shaped like an arrow goes towards the center of the wing. Glue with thin CA.
  • Page 6 ! Glue the two 1/16” plywood servo reinforcements to the 1/64” plywood sheet as shown. Take care to not fill the holes with glue. ! Glue this 1/64” plywood sheet to the bottom of the center wing such that it is flush with the back of the trailing edge and centered.
  • Page 7 ! Glue two 3/32” balsa braces to each of the outer ribs as shown. ! Verify that the top and bottom spars are glued to the vertical spar completely and that there are no gaps in the glue joints. ! Lightly sand the wing to remove any bumps and glue Covering the Wing and Tail The Switchback kit comes with a clear, paintable covering called Doculam which is actually a laminating film.

  • Page 8: Fuselage Assembly

    ! Once both sides of the wing are covered, shrink the covering with a covering iron or heat gun. If you are using the supplied clear covering, you will need a fair amount of heat to shrink the covering but too much heat will result in a hole. ! Tack the covering down around the servo hole then cut the hole out with a sharp Xacto.
  • Page 9 ! Glue the 3/32” balsa blind nut support to B4 so that the holes are centered. Press the blind nut into place. ! Position bulkheads B2-B6 in the 1/16” front bottom fuselage. The blind nut and support are on the front of B4 facing forward. You will insert the landing gear bolt from the wing opening. Glue with thin CA.
  • Page 10 ! Glue the motor mount parts together ensuring they are square and tight. Position the motor mount into B2 and B3 so that it is flush with the back of B3. Glue with thick CA. ! Position the 1/32” balsa fuselage sides. They will line up with the bulkhead tabs and with the bottom of the last part of the rear stringers.

  • Page 11: Landing Gear Assembly

    ! Glue the two 3/32” cowls together. Sand the front of the fuselage so that the cowl pieces fit flush then glue the cowl to the fuselage. ! Sand down the cowl to give it a nice rounded look. ! Position and glue the two 1/8” wing holddown dowels in holes in the fuselage in front of and behind the wing saddle.
  • Page 12 ! Glue the other 1/32” ply rectangle over the gear assembly to contain the wire. ! The gear assembly will slide up into the bottom of the fuselage and is contained with a 4-40 bolt accessed from the wing opening. ! Slide the wheels on the gear wire.

  • Page 13: Aileron Servo

    ! Slide the wheel onto the tail wheel wire. ! Slide the 1/16” laser cut plywood hub onto the tail wheel wire and glue in place with CA. Use caution to not glue the tail wheel to the wire. Elevator and Rudder Servo ! Install the rudder and elevator servos upside down in the servo tray.

  • Page 14: Final Assembly

    Final Assembly ! The stock motor is neutrally timed. You can get more power out of it by timing it. I have a pair of bent nose pliers that have the tips ground to more of a point. On the endplate of the motor, there are two holes.
  • Page 15 ! Trim the insert to the bottom of the canopy base. It is easy to split the plastic so work slowly and make your first cut at least 1/4" out. Paint the insert if you prefer. ! Push the base and insert into the clear canopy. You will need to push it in as far as possible to get a good fit with the fuselage.
  • Page 16 ! Press the tack partially into the 1/4" stick so that the magnet will be aligned with the tack. Apply a drop of thin CA where the tack meets the stick. Be certain to not get CA between the tack and the magnet.

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