Al,
When designing the cooling on my CZ, I paid more attention how to
get
the air OUT from the cowling, since we don't have the means to
push
it in, at taxi or low speeds. My exhaust gasses work the turbo
for
more HP, but also they are used in the augmentor tube to suck and
expel
the hot air from under the cowling. All my coolers are
discharging
the heated air inside the cowl.
Buly
http://tinyurl.com/dcy36
Buly,
I agree getting the
air out is important; and in my case, getting it out of the cowling seems to be
working pretty well. One of my 2 cooling rads is in the cowl, and air
drawn through it by the prop on the ground definitely helps keep coolant temps
down. The exhaust exits at the center of the port at the right (see
photo), and there may be some minor exhaust augmentation.
The oil cooler (main
concern) is in the wing on the right, and the 2nd rad on the left. Entrance
is under the wing. That’s where there is little flow when not moving at a
good speed. Not much chance of making that exit into the cowl, not easy
to augment with a fan – in or out. If it works well in the air,
then the water spray idea may be simplest for extending ground ops.
Not really concerned
much about the case of waiting in line for takeoff. It is very easy to
shutdown when waiting, and fire-up when ready to move.
Al (Strained back eliminating
airplane activity; maybe I can get caught up in my office)