"Jon Kraus" wrote in message newsBm%g.17816

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

Sometimes cowl flaps can really disrupt airflow. On the DC3, the cowl flaps
have 3 positions: open, closed, and trail (controlled, btw, by a pair of
round valve handles that look for all the world like they were borrowed from
a steam locomotive). Open,they really stick out all around the cowling, and
in trail, they are pretty much closed, but will stay open a bit as needed.
Cowl flaps are an item on the pretake-off check. If you try to take off
with them in "open", it will set up a hell of a buffet.