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Old 03-15-2023, 03:37 AM
rv8or rv8or is offline
Join Date: Oct 2007
Location: Norwich England
Posts: 232
Default Cowl Hinge Shims

RV8 Builders

Looking at the shims for the piano hinges on the firewall
What thickness did people use?

Just trying to get a starting point.

Thanks, in anticipation.

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Old 03-15-2023, 08:32 AM
wirejock's Avatar
wirejock wirejock is offline
Join Date: Oct 2005
Location: Estes Park, CO
Posts: 6,029
Default Shims

Mine is a 7A with Skybolts but the concept is similar. I used .032". However, I added a strip of carbon fiber and a strip of fiberglass over it. That's about .020" thickness of stiffener material. Without the added material, I would use .025". Even if its slightly shy, the micro, primer and paint will take up the difference.
Larry Larson
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Old 03-16-2023, 03:17 AM
rv8or rv8or is offline
Join Date: Oct 2007
Location: Norwich England
Posts: 232
Default Shims


Thanks that is what I needed.

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Old 03-16-2023, 10:46 AM
PilotjohnS PilotjohnS is offline
Join Date: Jan 2016
Location: Southwest, USA
Posts: 2,670
Default followed the instructions but..

I followed the plans but the top hinge is curved and uses a smaller rod to go through the curves. this makes the cowl loose at the top. If I did it again, I would increase the shim thickness where the piano hinge flattens out at the top to keep the cowl tighter to the top skin/firewall.
John S

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