----- Original Message -----
Sent: Monday, February 26, 2007 3:39
PM
Subject: [FlyRotary] Re: cowl openings
for water radiators
John, don't know if these photos will help. But,
like you I only have between 3 and 6" of duct distance on the radiators.
You should do Ok with 20 sq inch on each opening with a good
diffuser/duct. Attached are some photos of my current ducts. The
openings are 18 sq inches each. I have had one opening down to as little
as 10 square inches - but that was a bit marginal - so opened it back
up. I have a generous exit area for the hot air including a larger 4" x
12" bottom opening as well as louvers on each side of the cowl. So you
mileage could vary - but Tracy has essentially the same size opening as well
as several others.
Ed
----- Original Message -----
Sent: Monday, February 26, 2007 12:12
PM
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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