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----- Original Message ----- From: "Jerry Hey" <jerryhey@earthlink.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Thursday, March 31, 2005 6:08 PM
Subject: [FlyRotary] Re: Davies-Craig EWP Test Results
Bob, thanks for the test. I wish you could convert everything to 1.25
hose. The reduced sections must have a significant negative effect.
I am not a pump expert but I think the EWPs are intended to move a
large volume at low pressure and probably do not do well with
restrictions. If you wanted to change out the fittings on your rad to
1.25s, I am sure Ed Klepeis could do the job.
I am converting my rad from AN16 to 1.25 hose which will be the only
size in the system. This is easy for me as I have a C& R rad in which
the inlets and outlets of choice can be simple screwed in place.
After reading the mixed results from your test, I goggled Davis, Craig
and spent an hour reading one good report after another.
Thanks for the effort. We all appreciate it. Jerry
I note that Paul L. again today pointed out that only a certified fool
would use an EWP.
...cut
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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