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  #1  
Old 11-03-2018, 05:58 PM
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Location: Half Moon Bay, CA
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Default Asymmetric top cowl trimming?

Hi Guys,

I'm using DanH's cowl trimming technique http://www.vansairforce.com/communit...60&postcount=2) and have set up equal gaps on the left and right inlets per Dan's instructions. However, I find when I go to mark the cowl, one side needs zero trimming, while the other indicates 10/32" worth. Pretty asymmetric! Has anyone else seen this?

I'm working on a newer pink cowl.
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  #2  
Old 11-03-2018, 06:55 PM
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To compensate for P factor (torque) the engine is not mounted straight to the fuselage. Measure it, you will see what I'm talking about.
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  #3  
Old 11-17-2018, 07:47 PM
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So, not trusting that I was using DanH's method correctly (http://www.vansairforce.com/communit...60&postcount=2), I decided to mount the prop, level the spinner plate and laser it, bisecting the spinner plate (convenient alignment holes provided!). Sure enough, the left inlet is quite a bit larger than the right.

Left side: 10/32"



Right side; zero trim


Black lines were my first try on the floor; the laser pretty much confirms it.

However the overlap on the left side is pretty small .. 1/16" ish. Looks like I'll need to extend cowl edge a bit.
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Bill Bencze
N430WB (reserved) RV-7 #74152, tip-up. Working the baffles
Log at: http://rv7.wbencze.com
Defeating gravity one rivet at a time
VAF 2018 donation happily made
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