Engine movement

[Bob Turner]

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.

 

[Bartman]

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.

 

[Bob Turner]

That's a good guess. My spinner is big enough for a DC-3. Just sitting there it appears maybe a half inch above the cowl.

 

[Bruce]

For fun look up u tube on lord mounts I found a vidio showing the movement during aerobatics.

 

[aftCG]

First thing I look for when I roll inverted is my lunch

 

[Bob Turner]

For me, oil pressure. Then horizon. After six, lunch.