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Old 07-07-2015, 01:36 PM   #9 (permalink)
freebeard
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Quote:
A large suite of features combined to allow the acoustic stealth performance.NASA has studied Raptor/Owl acoustics extensively.
IIRC it was a light plane with a five-bladed prop and a large (like the whole tail of the fuselage) muffler.

Now we have Black Helicopters.
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