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Reply-To: "kevin lane" <n3773@comcast.net>
From: "kevin lane" <n3773@comcast.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-601048@logan.com>
Subject: Re: [FlyRotary] New information on engine centerline
Date: Sun, 9 Jan 2005 18:04:23 -0800
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on my -6a it appears that the Lycoming engine centerline is at the same 
elevation as the split in the cowling.  The circular portion behind the prop 
flange consists of two perfect half circles.  My rv8/20B installation, using 
a fred breese engine mount, appears to duplicate this centerline very 
accurately using the stock cowling.
Kevin Lane  Portland, OR
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----- Original Message ----- 
From: "Ernest Christley" <echristley@nc.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Sunday, January 09, 2005 5:42 PM
Subject: [FlyRotary] New information on engine centerline


> 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)."
>
>
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