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Date: Fri, 20 Apr 2007 10:54:23 -0400
From: Ernest Christley <echristley@nc.rr.com>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Single Rotor Testing
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Lehanover@aol.com wrote:

> In a message dated 4/20/2007 8:08:10 A.M. Eastern Daylight Time, 
> echristley@nc.rr.com writes:
>
>     The most interesting fact of this test is the possibility of a power
>     > estimate. Calculated power using a BSFC of .5 is 30 hp. Looking
>     at the
>     > power curve of the LeMans engine, this is about 10% below of
>     what is
>     > shown there. From this, I believe the projected over 100hp at
>     7500RPM
>     > is within reach.
>     > 
>     > Richard Sohn
>     > N2071U
>
> Just looking at a dyno sheet from one of my bridge ported 12As shows 
> 218.2 HP at 7,500
> RPM, 152.6 foot pounds, 1517 and 1494 EGT, .673 BSFC, 164 degrees oil, 
> 100.1 PSI oil pressure, and A/F of 12.1.
>  
> This engine is not used at that low an RPM so it is not tuned to be 
> ideal there. It is used between 7,800 RPM (229.4 HP) and 9,600 (242.2 
> HP) with peak power at 9,400 RPM ( 244.8 HP).
>  

Lynn, do you have any dyno data that would correspond to the BSFC an 
airplane would use in cruise, ie extremely leaned?  I'm guessing the 
answer is, "No, what would a racer do with that?", but it can't hurt to ask.

> With a Pport and some work on tuned lengths, perhaps 120 HP at 7,500 
> RPM. is available.
>  
> Sun&Fun is still ongoing. You all should be there. A Renesis engine 
> with a Marcotte reduction is under power each day. Art Rudko Lutz 
> Florida. 1-813-792-2787.
>  
> Land at Zephyr hills and rent a car. Also buy your tickets at the 
> counter inside. Free Zephyrhills water in the cooler. Very good.
>  
> Lynn E. Hanover
>
>
>
> See what's free at AOL.com 
> <http://www.aol.com?ncid=AOLAOF00020000000503>.


-- 
         ,|"|"|,              Ernest Christley       |
----===<{{(oQo)}}>===----    Dyke Delta Builder      |
        o|  d  |o        http://ernest.isa-geek.org  |