|
|
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
--
Homepage: http://www.flyrotary.com/
Archive and UnSub: http://mail.lancaironline.net/lists/flyrotary/
|
|