Engine movement

Bob Turner

Well-known member
One of the things I look for when I roll inverted is how much the spinner moves with respect to the cowl. I think with new engine mount bushings my spinner moves somewhere between 3/4" and 1" from rightside up one G to upside down one G.

Of course the other thing I look at is oil pressure - today it took several seconds on the first inversion to come up. It usually takes a half second.

Anybody else notice these things? My inverted system is the Christen setup.


Staff member
New Jersey, USA
Bob, just curious, now that you've replaced the rubber mounts, how well does your spinner match up with the outline of the cowl?

My 7ECA is about an inch below the cowl lip, I figured it was due to the cowls being universal for planes with larger engines and larger diameter spinners.