BTIZ wrote:
lets see.. wing leveler and heading control... sounds close to roll and
yaw..

The ones I've seen have only one servo - the ailerons. They track heading by
controlling roll.


BT

"Dave Butler" wrote in message
...
To me an axis is

roll-pitch-yaw. Unless the autopilot controls two of those, it's a

one-axis

autopilot... but I'm swimming against the tide.