My spinner is 16" in diameter and the duct opening is 16x5 inches for a
frontal area of 80 square inches. The radiator is 17x18 x 2 inches
thick. I was thinking that the opening of the duct ought to be a little
smaller, say, 4x16 for an opening of 64 square inches. that would be 20%
of the frontal area of  of the radiator/oil cooler.Anyone have any input?

Brian Trubee

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20% should work fine Brian. You might contact Will James.
He may have a cowl for you with that type of scoop that will fit.
Will James <will@jamesaircraft.com>

You should do this now before you get too far along.

Paul Lamar

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Thanks Paul.

I was going to be a masochist and build the cowl myself.

Brian Trubee

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You ain't just a woofing :) If it don't fit exactly you might be
able to section it.

Paul Lamar

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Come to think of it Brian you might want to contact Mike
Wills. He has a fine looking cowl for an RV4.
Maybe he would let you make a female mold.
Dave Leonard may have his phone number as Mike is no longer
on here.

Paul Lamar