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<... isolate the engine compartment from sources of fresh air ...>
Don't know how you'd do that. Radiators exhaust into the engine compartment. If there was no air circulation in the engine compartment you'd have VERY hot exhaust parts heating all that stagnant air and radiating to wherever (fuel rail? Belts & electrics? Coolant lines?) and roasting everything. Any plastic airplane (or cowl) would melt forthwith. The air leaking past even good baffling would support one hell of a fire.
If there was an easy answer, it would be implemented by now ... Jim S.
Dale Rogers wrote:
Hans,
I think you missed Michael's point.
It isn't the volume of air that's at issue, but rather where that air has to go. A direct-air cooled engine needs the air to travel in intimate contact with the cylinder fins - filling the entire engine compartment. An indirect-
air cooled system allows the airstream to be confined to a ductwork where there are no flamable liquids or gasses, making it far easier to isolate the engine compartment from sources of fresh air.
Regards,
Dale R.
From: Hans Conser <conserreceipts@earthlink.net>
Date: 2005/08/26 Fri AM 10:29:50 EDT
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: [FlyRotary] Re: Fire extinguishers
On Aug 26, 2005, at 12:55 AM, Michael Burke wrote:
...
The point I'm making is this. The rotary is NOT air cooled, (directly
anyway)therefore we can take a different approach in designing the cowl. We
do not need a large volume of air blasting into the cowl, because the the
radiators can be set up so that they are ducted from the outside seperately.
...
Actually liquid cooled engines need a great volume of air than air cooled engines. This is because the temperature differential (Delta T) of the aircooled engine is much greater. In other words it takes less air to cool 400 degree cooling fins vs 220 degree coolant.
Hans Conser
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