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Date: Sun, 09 Jan 2005 22:17:03 -0500
From: Finn Lassen <finn.lassen@verizon.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] New information on engine centerline
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Just curious. Anybody know the weight of the Powersport  PSRU?

Finn

Ernest Christley wrote:

> 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.
>