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spinner to prop clearance

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vhimsl(at)adelphia.net
Guest

Posted: Fri Apr 27, 2007 5:40 pm Post subject: spinner to prop clearance

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.  

   

   

        [quote][b]

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diesel(at)rconnect.com
Guest

Posted: Fri Apr 27, 2007 6:34 pm Post subject: spinner to prop clearance

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

  

 



  

 [quote] ---

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jhstarn(at)verizon.net
Guest

Posted: Fri Apr 27, 2007 8:24 pm Post subject: spinner to prop clearance

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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