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From: SHIPCHIEF@aol.com

To: Rotary motors in aircraft

Sent: Sunday, September 20, 2009 5:20 PM

Subject: [FlyRotary] Re: Another mixed day / Cooling experiments

Tracy & All;
I'm concerned about mixing the hot air out-flow from different coolers, then expecting them to 'share' a common exit from the cowl on my RV-8.
I started with two evap cores for a radiator, on the right side like Tracy's RV-8, except I directed the air to the engine side of the cooler, then out thru the cowl side. It did not work with a simple pressure cowl, and had too many suppport struts to work with an inlet diffuser duct. My oil cooler was at the bottom, and oil temp was never a problem.
So I moved the oil cooler up to the right side and made an inlet diffuser for it. I got a fairly standard Griffin radiator which I put under the engine with a new scoop at the front, ala Dave Leonard. The radiator air now exits in the bottom.
The left cowl inlet is for engine combustion air and surface cooling of the exhaust/turbo, and fuel injectors.
The radiator exit/inlet ratio is 1.3:1. The additional air from the left inlet might 'choke' the bottom outlet, so if testing confirms this, I'll have to make a left side cowl exit too.
Think of Fw 190 and Grumman Bearcat. They had cowl side exits and were quite fast aircraft.
The attachment is showing the right side of my RV-8, with the newly installed radiator scoop and the relocated oil cooler with it's inlet diffuser. The exit holes are too big because they were sized for the radiators. I'm going to keep them as-is until the next engine run. With louvers covering.
I'm still reworking the plumbing for the turbo oil drain, the radiator, and the fuel return line.

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