As I thought the pressure at the base of the windscreen was 3.6" H2o
roughly the same as it was on the front of the rad. The pressure
on the hood however was minus one inch of H2o. One inch of water
BELOW atmospheric pressure! Ideal place for
a rad air outlet if it were not for the fact that the hot
air from the rad would go into the cowl air intake for the
passenger compartment. That would give a pressure drop across the rad

of

roughly 4.7" of H2o at only 85 MPH. That is why you see so many race

cars

with rad air outlets in this position.

Spring loaded upward facing cowl flaps are used in just such an
application as that pressure distribution has been known for a long
time. I even believe Melmoth had them.
Problem is, oil leak or coolant and you have it on the windshield in a
tractor. Now, a pusher may be a much different story.
Remember the ram air intakes on the Chevs of past years? At the base of
the windshield. More air.
[Marc Wiese]

There is no need in an airplane. It is easy to get the air out
the side or out the bottom. It is tougher in a car as the ground
restricts the flow under the car and the front wheels get
in the way oolong the sides.

BTW the FireBird Transam had the first rear facing ram air at
the base of the windshield instigated by yours truly.

Paul Lamar
 
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