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Old 12-06-2012, 07:28 PM
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Toobuilder Toobuilder is offline
Join Date: Jul 2009
Location: Mojave
Posts: 4,902

Originally Posted by Sparky View Post
If I'm not mistaken, engine mount wobble (wet dog shake) is mostly rotational...
The operative word there is "mostly"...

My Hiperbipe will set up a resonance with the spring gear at certain taxi speeds/RPM and the spinner wobbles very noticeably in relation to the cowl. This is a non concentric path that in extreme cases will contact the cowl with the spinner backplate. The mounts are admittedly getting soft, but the point remains - consider some angular displacement when setting up minimum clearance from a very expensive propeller blade.
WARNING! Incorrect design and/or fabrication of aircraft and/or components may result in injury or death. Information presented in this post is based on my own experience - Reader has sole responsibility for determining accuracy or suitability for use.

Michael Robinson
Harmon Rocket II -SDS EFI
1940 Taylorcraft BL-65
1984 L39C - SOLD
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