Once again, nothing is ever simple. OK, here's my take on it. The evap. cores work well in a fast plane because they can make efficient use of the 200 mph air entering the inlets. This is a long and gory subject but to condense it to a one sentence rule, I wouldn't use them on a slower plane or a car running under 140 mph. You would not get sufficient pressure recovery in a car to make them work well. The water spray in the race configuration (on my plane) was mainly for the oil cooler and that was mainly due to the poor inlet & ducting to it. As it turned out, the race was on a cool day (62 deg F) and I didn't need the water spray. I ran it during the last leg to see the effect. It dropped the oil temps about 15 degrees. Tracy ----- Original Message ----- From: peon@pacific.net.au Sent: Sunday, February 08, 2004 6:25 PM To: Rotary motors in aircraft Subject: [FlyRotary] FD rads & Evap Cores Take 2 Hi Ed, Rusty,
Thanks fo the replies guys. However, now you have got my mate
Wally (and me!) REALLY confused. (}:<)
You are touting that 2 Evap cores as being able to cool better than
an FD rad (plastic tanks aside), but having less drag. So should I
throw away the FD core (with alloy tanks) in the race car and
replace it with 2 evap cores?
Will I then have less drag??? Will the race car then go faster, or
have better fuel economy at the same speed (a very important
factor in endurance racing)? Wow, ... talk about a "racer's edge"
.... if it's true that is ... Does anybody REALLY know ... I mean
from a practical rather than just a "running the numbers" point of
view??
Cheers,
Leon
P.S. BTW, why did Tracy need to spray his evap cores with water
to keep the enigne from turning into kettle - in level flight and at
high speed no less (in an air race or so I have read)???
e wouldn't have any more than 200 BHP would he?? If they won't
cool 200, how will they EVER cool 250?? The (lost) plot thickens,
... almost to the point of being thixatrophic (}:>).
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