Mailing List flyrotary@lancaironline.net Message #19662
From: Bob White <bob@bob-white.com>
Subject: Re: [FlyRotary] Re: Davies-Craig EWP Test Results
Date: Thu, 31 Mar 2005 20:18:58 -0700
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Hi Thomas,

I doubt there will ever be a good time to discuss EWP's with PL.  I think the
idle cooling theory is at least partially correct.  I also think Bill Shertz
formulae are pretty much on the money.  I would prefer higher flow also, but
willing to try to duplicate Todd's success. Bob W.


Well, PL pointed out that it takes more than any of the available/discussed
EWP's to duplicate the original EDWP's flow.
According to Bob's tests and other data available ( B. Schertz's doc.), he
is right on that.

What seems never have crossed his mind though is the possibility, that the
EDWP was built to cope with idle-speed/heat/AC-on/stop and go traffic - as
recently discussed on here.
Todd seems to get away with EWP just fine, so maybe the flow doesn't have to
be so high.
I don 't dare to challange PL on the possibility that the EDWP is probably
way over sized and needs lots of power for that excess flow ( ..not now at
least, as long as he is too "irritated" about EWP's :)

What I would like to know how the recently discussed low flow/high delta T
affects the engine - higher local temps at the spark plug areas and therefor
higher delta T to the intake area. Warpage, etc.
Probably no way to tell yet, but wait for some EWP equipped bird do some
serious time with that layout.

Intuitively I am not a EWP fan (I prefer the high flow/low delta T
approach - more temp tolerance in my specific hot surroundings), but like
some others on the list I will wait for serious results - can't beat the
proof in the P.!


Cheers,
Thomas J.


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