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spinner to prop clearance

 
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vhimsl(at)adelphia.net
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PostPosted: Fri Apr 27, 2007 5:40 pm    Post subject: spinner to prop clearance Reply with quote

Hello,

The plans say 1/16 to 1/8” gap clearance between spinner and prop (catto three blade)

My gap(s) are more like 1/8” to ¼”

Are we talking aesthetics here or safety/performance?

Anyone per chance with the same gap (gaffe) and prop?

Thanks
Vince H. Finish
RV8-VSB
Estimated time of completion: 6 years ago.


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diesel(at)rconnect.com
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PostPosted: Fri Apr 27, 2007 6:34 pm    Post subject: spinner to prop clearance Reply with quote

Vince...

Most appear to be going for tighter clearances but I enlarged mine to 7/16" and glad I did. The cowl is difficult enough to get off & on without scratching the paint now without it being still tighter. I think the feeling here is some efficiency (performance), mostly aesthetics, but not much maintainability. My prop was a Sensenich FP but since converted to Hartzell CS.

Another popular close fit is around the tires on wheel fairings to improve aerodynamics but I have seen many chaffed tires. I tried for a "thumb width" around the tire and even enlarged it later to allow the tires room to flex. I did chose ease of maintenance over a couple knots I built and this has served me well.

Dick DeCramer
N500DD RV6
200 hours
Northfield, MN




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jhstarn(at)verizon.net
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PostPosted: Fri Apr 27, 2007 8:24 pm    Post subject: spinner to prop clearance Reply with quote

Seven years ago the HRII (IO-540) was ready for the cowl/spinner clearence question. I ask on line and was advised to leave at least 1/4 at the top & 7/16 at the bottom so when the "sag" occured they would even out. This was reportedly because of the "extra" weight of six cylinders & longer monment. Well six years later I'm still waiting for the "sag" to even up the gap. Not sure how many 1/1000th's of a MPH we lost because of the gap BUT take a look at the spam cans (Comanche's) gap & SMILE. KABONG Do Not Archive
Quote:
From: Dick DeCramer <diesel(at)rconnect.com>
Date: 2007/04/27 Fri PM 09:33:43 CDT
To: rv8-list(at)matronics.com
Subject: RE: spinner to prop clearance

[quote]Vince... Most appear to be going for tighter clearances but I enlarged mine to 7/16" and glad I did.  The cowl is difficult enough to get off & on without scratching the paint now without it being still tighter.  I think the feeling here is some efficiency (performance), mostly aesthetics, but not much maintainability.  My prop was a Sensenich FP but since converted to Hartzell CS. Another popular close fit is around the tires on wheel fairings to improve aerodynamics but I have seen many chaffed tires.  I tried for a "thumb width" around the tire and even enlarged it later to allow the tires room to flex.  I did chose ease of maintenance over a couple knots I built and this has served me well.   Dick DeCramerN500DD RV6200 hoursNorthfield, MN  ---


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