RE: Blue Bird Servos
My experience wth the BB 621s are not so glowing. I decided to try a couple for the elevators on my Showtime. The advertised speed and torque seemed great, but the performance sure doesn't live up to the hype. They are definitely slower than they're rated. But the worst part is that the last 10 degrees of movement takes over a second. It looks like the servo gets close to the requested position, then tries to ease up to the final position. Plus there doesn't seem to be much strength around zero. The arms are too short for decent surface travel, and the supplied servo horn screw is too short to use with Dubro arms. I have to find some longer screws somewhere.
I still may give them a shot in the air, but right now, I'm really skeptical.