Quote Originally Posted by usarmyaircav View Post
Printbus is that first one the kind of servo that tilts the blades on a collective pitch RC helicopter? Not to get too off track but since seeing your sig, I have been interested in RC helicopters again. I worked on Cobra and Apache Attack helicopters in the Army.
Sort of. Smaller RC helicopters often use linear servos to move the swashplate, which ultimately controls the pitch of the main blades. The linear servos are used since they're small and light. Larger RC helicopters will use rotary servos since they're stronger and likely faster. A collective pitch heli will have four servos - three controlling the swashplate and an additional one controlling blade pitch on the tail.