rth119

I'm at about 7 1/2 pumps for full. Did you fix the problem? If so, how?

Mine flys the same. In calm air, it's straight and true, but unstable air, and I get the left-right yaw. It's a bit unnerving at first. here's a paragraph taken from LASARs Mooneys Buyer's Guide: http://www.lasar.com/sales/buyers-guide.asp "All Mooneys from 1965 through 1977 were equipped with Positive Control, a single axis, full-time autopilot that serves as a wing-leveler. PC can be interrupted by a thumb button on the control yoke for manual control during takeoffs, turns or landings; otherwise, it is engaged at all times. The system is a definite help for IFR operations and for stability in turbulent air, especially in the short-fuselage Mooneys; they tend to yaw markedly in choppy air."

Thanks for all the posts and shared experience. This is my first Mooney, so I'm not sure what is normal and typical for Mooney, and what may be a potential problem. It seems to me that the tail "wiggle" is typical in short body Mooneys, especially ones without PC. My Mooney does not have the PC installed. I think it wasn't available until 1965, and mine is a 1963. I can say the wiggle kind of scared me the first time...thought maybe the rudder was falling off or something. I don't have a lot of experience in general. I'm about a 100 hour private pilot...just got my license this summer. I've only flown C172 and Piper Arrows, and I don't remember ever experiencing the tail wiggle in the cessnas and pipers like I do in this Mooney. But, if it's normal and typical for these older mooneys, then its something I'll get used to and expect. No worries.

I just purchased a 1963 M20C, and after flying it recently I noticed the tail to yaw back and forth sometimes during cruise. I've been trying to find out if this is normal, or if there is a problem. Doing some research on the web seems to show that it may be a normal occurrence in Mooneys in rough air before the PC system was implemented. I would appreciate any advice or experience with this effect.