Ray 'ere,
I played with the 400 for a while last eve after talking to you.
I don't think the chirping sound may be electrical although I have been known to be rong.
The chirp is accompanied by a clockwise twitch of the tail so I'm thinking it is mechanical.
I disconnected the servo push rods and moved the swash up and down and noticed a bit of a hangup and after a close look I think the washout base is trying to bind as it gets to the point where the slot fully covers the guide pins.
I know it's a lousy description but long and short of it is I believe the washout slide pins may be out of kilter.
When I built the Rex, during the setup process I was advised to minimize the clearance between top of the washout slider and the base of the head hub assembly at full upward travel of the swashplate.
The setup of the 400 presents a clearance of just over a millimeter and I'm thinkin' that may be excessive....whatcha think...?
Anyway, I'm doing further dismembering this eve. Sure would like to find a decent CNC hub and washout system to replace the stock plastic items.
She's still a good bird and too young to be retired so I'm going to fix her up.
I'll keep you posted.
Oh, one more thing....:
Some time ago did I see a mention of a helicopter where one could set up the tail rotor drive completely before installing it into the body or was I dreaming...?
Ray