What are cowl flaps?

On 26 Oct 2006 15:05:08 -0700, "swag" wrote:

They absolutely cause a 10knot difference in performance in a Skymaster
P337.
And if I recall they caused about 7 knots degradation in my 73 F33a Bo

In my old Deb which has a number of speed mods and big engine they are
good for at least 10 knots.

Jon Kraus wrote:
5 or 10 knots? What are they freakn' barn doors or something? :-)
Sure your not fibbing?

It's not the flaps creating the drag. It's the air the let in around
the engine and out the bottom that adds the extra "cooling" drag.




Ron Natalie wrote:

In my plane, I can get another five to ten knots when
I close them.
Roger Halstead (K8RI & ARRL life member)
(N833R, S# CD-2 Worlds oldest Debonair)
www.rogerhalstead.com