----- Original Message -----
Sent: Tuesday, February 27, 2007 12:35
AM
Subject: [FlyRotary] Re: cowl openings
for water radiators
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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