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Mark,
This is in an RV, but I just put a heater core into a box with flaper valves to direct air and a "heater valve" in the water line just like a car. The core has two copper lines that project forward through the firewall, so there are no hoses in the cockpit. The hoses and water valve are forward of the firewall.
As you can see, air is taken from the NACA fresh air vent. It can be directed through the core to the floor or up to a defroster vent, or any combination thereof. The water valve takes care of temperature control. It works exactly like an old car.
I can discern almost no help cooling the engine by opening this thing up. At any rate, when cooling help is needed here in Texas, putting this on full blast would probably melt your shoes.
Bill Eslick
235 hours
-------Original Message-------
Date: Tuesday, December 02, 2003 06:05:35 PM
Subject: [FlyRotary] Heaters/defrosters
Is there a "best practice" for cabin heat/defrost systems for rotary
a/c. Those of you that are flying, how did you approach this item. It
seems to me that with all that heat going out the tailpipe, it is a
no-brainer... except for the carbon-monoxide thing. Then again, I don't
want to be scalded with hot ethylene-glycol either. The exhaust muff seems
like the lighter and simpler solution. On the other hand, with proper
ducting, the heater core could add extra cooling during climb-out.
Comments welcome,
Mark S. (hot oil exchanger is out of the question)
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