"Robinson, Chad" wrote:

Does the heat output scale linearly with the number of rotors?
That is, is the cooling challenge for a 20B exactly 150% of the
challenge for a 13B, or are there other issues related to the heat
density, maybe obstructions to the flow of coolant or oil,
or anything else like that here?

Thanks,
Chad

Directly proportional to HP. Lots of ducting issues. The obstruction
behind the radiator are more critical than the inlet duct because
everybody intuitively  understands an inlet duct for the most part.

Paul Lamar

Do you just convert the HP into watts to figure out how much heat to
disapate?

Does 100 hp = 65 kw watts...ballpark?

Phil

Basically yes. 746 watts = one HP.

Engines have what is called a heat balance. YOu can take a gallon fuel and divide it
up. 25 to 30% as mechanical energy out, 35 to 30% into the cooling system and
50% out the exhaust in the form of waste heat. Here are a few heat balances
for different engines. Also go on the web site below and read the cooling
article.

Paul Lamar
 
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