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From: "Ed Anderson" <eanderson@carolina.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-887060@logan.com>
Subject: Re: [FlyRotary] Prop Flange to Cowl Relationship
Date: Sun, 18 Dec 2005 10:09:05 -0500
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Bill, not certain I fully understand your question.  The prop side face of 
the RD1-C needs to sticks out in front of the  cowl   by at least 1/8-3/8" 
for prop clearance.   That is the front most part of the cowl where the prop 
shaft exits. Of course, this is dependent on how you design your motor 
mount. If you are putting the engine closer to the FW (than I have) then you 
could need an prop extension to get the prop to clear your cowl.   If you 
are using any sort of prop shaft extender then you still need same sort of 
minimum clearance between back of prop (face of prop hub) and cowl.

Don't understand the reference to  2" you mention, I think that some model 
Lycoming engines  may need the 2" prop extension to clear the standard RV 
cowl.   Perhaps I did not understand your question?

Ed A

----- Original Message ----- 
From: <bbradburry@allvantage.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Sunday, December 18, 2005 9:45 AM
Subject: [FlyRotary] Prop Flange to Cowl Relationship


>I have my motor mount jigged up and am ready to start fitting the pieces
> together.  My question is what dimension should I set between the forward
> face of Tracy's RD1-C and the forward face of the cowl?  I am certain that
> the PSRU is inboard of the cowl and it appears that this distance is about
> 2" on the several Lyco planes that I have looked at.  I assume that 
> various
> prop manufacturers would need different clearances and that there are
> extensions available, but I think this distance should be somewhat 
> standard
> and I don't really have a clue as to what it is.
> Thanks,
> Bill Bradburry
>
>
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