The bottom bell curve opens up too fast as it progresses towards the
radiator.  You'll get flow separation and perhaps even a bubble (cylinder)
of turbulence that blanks from 1/3 to 1/2 of the radiator.

Chris C.

That is interesting Chris.  I was going to say that looked like the best
part of his duct. It jibes with modern thinking on rad ducts from
Kuchemann & Weber and even Hoerner for that matter. Look back in old messages.
We discussed this very extensively indeed. When did you come on board?

I think I've been with the group for about a year now.

I'm quoting loosley articles I've seen/read in Contact magazine about WWII
aircraft with belly scoops that encountered the same phenomenon. I think
they installed vanes to help the air make the turn.

Chris

By the end of the war the P51 belly scoop and duct were obsolete :-)
The bell shaped duct is IN! :-)

What are you guys planning on using in your new design?
How is it coming BTW?

Watch out for NemesisNXT. One of my hangar mates has already plunked his
money down. I think you can blow them away with a turbo three rotor.
You will probably need so much cooling the rads will have to go in the
aft fuselage.

Paul Lamar
 
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