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Date: Sun, 09 Jan 2005 20:42:21 -0500
From: Ernest Christley <echristley@nc.rr.com>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: New information on engine centerline
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Jim, I was just looking at Atkins website and got some interesting 
information. The page of interest is:

http://americanrotaryengine.com/id10.html

and it contains the quote

"The 55 tooth internal spur ring gear raises propeller shaft almost 2 
inches for improved propeller clearance, resulting in an identical 
propeller centerline as Lycoming installations and..."

At this point, I don't know where my engine sits, compared to the 
Lycoming.  The plans say to put the engine's mounting face on the 
aircraft centerline vertically, and provide 1.5degrees upthrust.  Then 
the engine's rear mounting surface's centerline is moved left 1/4", to 
give 2/3rd degrees right thrust.

Right or wrong, I used the center of the firewall end of the eccentric 
shaft as the 'mounting surface centerline'.  Made it level with the 
aircraft centerline and 1/4" to the left.  Since the PSRU shaft is 
concentric with the eccentric shaft, I kept it on the horizontal 
centerline and moved it up 5/8" from the vertical.  From the above 
statement, I may have just shortened my prop by 2".

Well, I was wanting to have a go at building a 4-blader anyhow.

-- 
http://www.ernest.isa-geek.org/
"This is by far the hardest lesson about freedom. It goes against
instinct, and morality, to just sit back and watch people make
mistakes. We want to help them, which means control them and their
decisions, but in doing so we actually hurt them (and ourselves)."