Al Gietzen wrote:

On the subject of ducts; thought I'd share with you some pics of the mold I
will be using to make the fiberglass inlet duct diffuser for the in-cowl
radiator for my Velocity. Shown here with a foam mock up of the rad; it
roughly follows the Kuchimann-weber expansion profile, while also doing a 90
degree turn (and a bit of twist). It is sculpted from urethane foam
(laminated 2" thick insulation) and will be hard-coated with
epoxy/microbaloon slurry, painted with mold release, and the glass plys laid
over it.  I know; you sheet metal guys are green with envy.

It will pick up air under the wing and bring into the cowling.  The Ron
Davis radiator is shown in third pic.  This is one of two radiator and will
carry about half the heat load from the 20B.

Al Gietzen

Looks great Al. Should work great if the back side is unrestricted.
I think I will make my rad duct the same way using the foam trick.

Paul Lamar

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