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Ed,
Mark,
I have
a cowl flap. At first it seemed to do no good at all, but after about 5
hrs of flying around on a 90deg day testing it open and closed, it does seem to
make about a 10-15 deg F difference (coolant) and cost me about 5 kts in
cruise speed. It takes a long time for the change to manifest itself in my
temperatures. Luckily I only seem to need it in climb even on a hot
day. Looking back, it was worth the trouble.
Dave
Leonard
Mark,
I considered them in my early days when I was
fighting high temps. But, once I solved that I have not really
considered them. The only person I am aware of using them is Bill
Eslick. You should contact him for details, but my impression was that
while they appear to work in aiding cooling, they also acted like a speed
brake dropping over 10MPH from his cruise. I believe he also found it
very difficult to close them down against the air flow out of the cowl when he
tried to close them to minimize drag.
But, again contact Bill for the full
skinny.
Ed
Ed Anderson
RV-6A N494BW Rotary Powered
Matthews, NC
----- Original Message -----
Sent: Wednesday, July 14, 2004 2:46
PM
Subject: [FlyRotary] Re: New
Scoop
Ed,
What are your thoughts on cowl
flaps. Do you use them?
Mark
S.
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