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John, can't answer your question on size of opening
from operating experience, but Ed Anderson's results indicate that you should be
okay.
I am enclosing some pictures of the technique I
used to make the trumpet shapes and have them mount to the radiators and meet
the cowl openings.
1. Cut a piece of cardboard the size of the active
area of the exchangers, and tape it in place
2. Cut a piece that fits in the cowl opening, then
cut a small foam block to fit between the two. Cut and try, sand to fit. Hot
glue them together. This is shown in pics P6130001 and 2
3. Remove them from the plane and you end up with
P6130003, with the cardboard pieces reflecting the planes of each opening. Make
a box coated with packing tape around each assembly, and pour in some
pour-foam.
4. After it hardens, you can remove the box, and
sand the foam to the appropriate shape P6160004 is part done, then P6210011
shows them coated with micro ready for fiberglass layup.
Bill Schertz
KIS Cruiser # 4045
----- Original Message -----
Sent: Monday, February 26, 2007 11:12
AM
Subject: [FlyRotary] cowl openings for
water radiators
What size openings do I need for the water
radiators? The Wittman Tailwind cowl I have has postal slots of 3'
x 7 3/4" , which is approx. 22 1/4 sq in. on each side. Sam
James for the 160 Lycoming is using 4 3/4' round holes which are 17.6 sq.
inches on each side. My radiators are quite close to the opening and I
plan on making the diffusers trumpet shaped, will the openings be large enough
if I can stay over 20 sq. inches on each side with a decent trumpet
shape. JohnD hushpowere II on
order - hope to start in 2 weeks if weather cooperates.
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