Aileron Servo - Mountain Models Switchback Sport Builder Manual

! 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.
! Install single arm control horns to the servos after first attaching the pushrods through the outer
hole of the control horn.
! Cut two pieces of heat shrink tubing ¾" long.
! Slide a piece of heat shrink over the back of the rudder and elevator pushrod.
! Cut two pieces of 1/32" music wire 2" long. Measure in ¼" and make a 90 degree bend.
! Take one of the music wires and insert the short end in the rudder control horn.
! Slide the other end of the wire into the heat shrink and heat the heat shrink. You will adjust the
position of the L bend wire so that the rudder points straight back. Use a drop of thin CA to
prevent the pushrods from slipping in the heat shrink. Note that the long pushrod wire is on the
other side of the control horn, which captures the control horn.
! Do the same for the elevator control horn.

Aileron Servo

! Install the aileron servo through the bottom of the wing.
! Use a servo control horn with four arms. Cut off two adjacent arms leaving you two arms 90
degrees from each other. Install the control horn so that the arms face forward, 45 degrees from
center. This is to give you differential aileron control to counteract adverse yaw.
! Cut four pieces of 1/32" music wire 3.25" long. Bend a Z bend in one end of each wire.
! Install two of the wires in the outer holes of the aileron control horns and the other two wires in
the outer holes of the servo control horns.
! Cut two pieces of heat shrink tubing 2" long. With the heat shrink, join the pushrods.
! Adjust the pushrod lengths so that the ailerons are level with the wing. Use a drop of thin CA to
prevent the pushrods from slipping in the heat shrink.
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