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I'm not sure I'd get too excited about a top exit. Yes, it will cool
down faster after shutdown, but that's not the real goal.
There's a lot of 'pressure recovery' (pressure is going *up*) when
you get to the rear of something that resembles an airfoil. Thorp
T-18's have the cabin cooling inlet at the base of the rear of the
sliding canopy, & they will part your hair in the back.
I managed to find this image of Pushy Galore (2nd fastest Reno F-1
racer at the time). Note the rather hard to see cooling inlet, about
1/2 chord at the wing root.
Also, here's a web page by an EZE builder who did his homework.
http://x-jets.com/downdraft_cooling.html
Charlie
On 05/14/2012 11:31 AM, Lehanover@aol.com wrote:
Since you are moving your inlet to the bottom have you
considered a top exit? Is the top cowl area close to the prop
in low pressure? I'm sure your turbo provides plenty of extra
heat during ground operations.
Bobby
Plus you get faster cool-down from chimney effect. Air
intakes in high pressure areas work great. In low pressure
areas, not at all, or flow backwards. Surface mounted intakes
require the flow be attached ahead of the intake to function.
So, a few vortex generators often do the trick. The scoop
style operating in undisturbed air will work perfectly.
Lynn E. Hanover
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