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Bede BD-4C Trim Operation

August 24, 2018 Art Zemon

Last night, I finished adjusting the trim on my Bede BD-4C airplane. Pitch (nose up / nose down) on the BD-4 is controlled by a horizontal stabilator. The trim operates an anti-servo tab on the back edge of the stabilator. (See my post Anti-Servo WHAT? Horizontal Stabil-WHERE? for a description of that techno-babble.) The trim mechanism is pretty simple but counterintuitive and a little hard to get properly adjusted.

I made a short video which shows how the horizontal stabilator and the anti-servo tab and the lever (in the cockpit) should work.

https://photos.smugmug.com/Aviation/Bede-BD-4C/Miscellaneous/i-dPxkmXC/0/8c57ed0f/1920/VID_20180823_191434-1920.mp4

 

After I shot the video, I installed the final hardware: fender washers next to the rod ends, castle nuts, and cotter pins.

Bede BD-4C

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About Art Zemon

Omni-curious geek. Husband. Father. Airplane builder & pilot. Bicyclist. Photographer. Computer engineer.

Comments

  1. Dave Cohen says

    August 24, 2018 at 9:29 pm

    Excellent commentary, very informative, and creative visual aids… I’ll be dreaming of trim mechanisms tonight 🙂

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