RE: Futaba BLS servos in F3A
Same here, all Brushless Futaba's, it's as good as it gets. I wouldn't use anything else.
I have used the BLS153 on ailerons with no issues. Mind you i used to use the 9650's
Pretty sure the BLS651 was intended for the car guys, it has the side mounting tabs and the centering is not quite the same, don't quote me on that just something i remember reading
BLS352 looks intended for 1/8 scale trucks, BLS 252 was intended for heli's. What difference in the servo design i don't know. Maybe different dead band etc
I use the BLS155 on rudder with no issues at all, massive over kill. In theory the servos should last longer, no commutator or brushes to wear out. I am thinking they would have better centering, not like 3/5 pole motors on traditional servos.
I suppose at the end it's what works for you
Chris