Installing a Servo to operate a Door Type Spoiler

by Steve Richman

Basically what I did was to fabricate a longer servo arm. This was done by sandwiching a long Hitec arm plus a portion of another arm between two pieces of thin plywood. Sounds a bit goofy, but it has worked very well. This arm swings up and opens the airbrakes.

Next, I wanted to be sure the airbrakes locked closed when not extended. I bent up a piece of music wire per the photo and glassed it to the airbrake. When the airbrake closes, the arm engages the loop in the wire and holds the airbrake closed. The wire is bent so there is some spring in it to allow the arm to tension the wire when closed.

Airbrake Slightly Open

Airbrake Fully Open

Airbrake Partially Open-Right View

Airbrake Partially Open-Left View