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Date: Tue, 23 Mar 2004 11:03:07 -0500
Subject: Re: [FlyRotary] Re: Prop coordinates
From: Bulent Aliev <atlasyts@bellsouth.net>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Message-ID: <BC85C9EB.AA3D%atlasyts@bellsouth.net>
In-Reply-To: <list-3114930@logan.com>
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Hi Ken, here is the information Tracy sent me with estimates on the HP for
my engine:

"Hello Bulent,

 Figure on 185 HP at 30" of manifold pressure (1 atmosphere) at 6300 rpm.
You can safely assume this will vary linearly with rpm in the rpm range that
matters (4000 - 6300).
 
 Factor in boost by multiplying the number you get from the above figures by
the number of atmospheres manifold pressure you run.  i.e ,  7.5 psi boost
would give you 1.5 atmospheres.  Then subtract 13% of the result for air
heating  from turbo compression and exhaust backpressure losses.
 
 This should be close enough for prop calculations.  You can compensate for
any error by varying the boost a bit.
 
 Tracy"

My PSRU is from Tracy 2.17 ratio and the plane is pusher Cozy MK-IV
I would like to build wood/fiberglass composite like this one:

http://www.maddyhome.com/canardpages/pages/plmjohnson/building_the_propeller
.htm

Please let me know if you need any other info.

Buly