Jim Huber incorporated a number of modifications into the control system
of his BD-4. Right now we have some drawings and pictures. Hopefully we will
be able to add some instructonal text here. Mark
Napier sent me the images and also plans to adapt some of these modifications.
For specifications for ball KP4A and KP5A bearings click here.
Click on the pictures to see a full size image.
Ball bearings at the lower end of the control stick.
Cessna (?) trim wheel with chain
Tail wheel steering and springs
Trim tab belcrank
Cessna trim actuator