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George,
Have not changed the heat exchangers. Just the plumbing and
shortened the hose loop by about 18 inches. The increase from 21 to 26% is
the opening size to core face ratio. I have about 272 sq in of core face
and the opens are now 72 sq in. If this test doesn't work I will be adding a
small oil to air exchanger in parallel with the oil \ water exchanger with
dedicated inlet and reducing my Rad inlets back to 21% / 58 sq
in. Actual core size is about 775 not 800 cu in as I stated
earlier.
Glad I have the molds for all this stuff.
Bobby (still wondering about Tracy's
cooling solution)
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On Behalf Of George
Lendich
Sent: Thursday, October 01, 2009 2:53 PM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Re: Activity
Bobby,
I've seen between 3 to 3.5 cu" per HP, I guess
that depends of how well the cooling is set-up, 800 cu" of Radiator should do
fine for 250hp.
If your previous exchanger was 650 cu" for 250 hp
it was undersized. I guessdamated that size form the info you previously
provided.
George (down under)
George,
I have 800 cu in of water to air exchangers. No oil to air
exchanger. At 6800 rpm \ 38" MP I'm producing close to 250 hp. But 15 hp is
used to drive the SC. So about 3.2 cu in per HP. The new openings are about 72
sq in. The goal is to lower the water temps from 200F to 185F with an OAT of
100F. Oil is running 20F hotter than water. With the 21% ratio I was only able
to maintain 185 HP and keep the oil temps below 220F \ OAT 95F. It all an
experiment.
Bobby
Bobby,
What is your expected HP.
How does 26% of core face equate to 3 cu" for
every HP
i.e. 200 hp = 600 cu"
George (down under)
With any luck I will be back in the air this weekend. I
made several changes including opening my inlets from 21% to 26% of my core
face. Of course it's no longer 105F so will have to extrapolate the data.
Other changes include relocating the battery back to the stock location,
removing 13lbs of tail ballets, new exhaust manifold and belly mount
muffler, CO Detector, exhaust heat for cabin, O2 system, autopilot, 230 psi
water spray for radiator and manifold injection (yet to be tested), re-plumb
the oil to water exchanger and a fresh pilot bi-annual
today.
Bobby
Anyone out there ??.....................<:)
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