The amount of heat rejected is very similiar, however the delta-T available
to drive the heat into the air is less for the Rotary than for the air cooled
engine because of the temperature limitations of the water cooling circuit.
Therefore we cannot heat the air as hot, and therefore need more air than for a
direct air-cooled engine.
----- Original Message -----
Sent: Wednesday, April 06, 2005 9:43
PM
Subject: [FlyRotary] Re: rule of thumb
and RV-3 sizes- was Cooling Inlet Areas/Bernie's RV9
snip
I mentioned that on the
other list, but I was dismissed as " you can't compare aircooled engines
with a rotary".
I don't think there is a
great difference on the amout of cooling necessary, as the efficiency of
both engines are fairly close. So some heat goes out the exhaust and the
rest has to be cooled. For sure you need different ducting, but the
amount of heat energy should be about the same and you want to get rid of it
with the least drag, either way.
snip[