Paul-

Almost ready to glass the diffuser.  Is the input opening 4" x 13", or
2" x 13"?  The front is 4 inches high, but I don't know whether the
input is the 4" all the way to the cowling, or narrows to 2".


Mark Supinski

That shape is a no no. It MUST be a perfect wedge shape
as in the second sketch. With a wall at the back like that
all the air will stack up near the aft end of the rad.

From there to the scoop opening the shape can be a transition
to an oval or an elipse. Just keep the cross sectional area
of the duct the same. Namely 4 by 13 or 52 square inches. If you place
the oil cooler along side the water rad it would be 4 by 18 or 72
square inches. Lets say the scoop is an oval it would be roughly
19 or 20 inches wide and four inches high max.
A smily face opening would also work.

Paul Lamar ...No rotor no motor.

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