gill-type cowl flap

gill-type cowl flap

gill-type cowl flap
The small flaps located near the rear of a cowling for a reciprocating engine. When the cowl flaps are open, amount of cooling air flowing through the engine increases by decreasing the air pressure at the point where air is leaving the engine compartment.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved