During today's phase 1 flight I started checking the autopilot, an S-Tec
55x.
When altitude hold is engaged the aircraft starts to porpoise. Acts like the
pitch
servo is making a larger correction then is necessary for the sensitive
pitch of a IV.
Has anyone had this problem?

Skip

Skip Long
N47SL, HWD
(650) 578-9167
FAX  576-9153
mailto:skiplong@videocomm.com