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The cowl (from the Latin cuculla, meaning a hood) is an item of clothing consisting of a long, hooded garment with wide sleeves. Originally it may have referred simply to the hooded portion of a cloak.he cowl (from the Latin cuculla, meaning a hood) is an item of clothing consisting of a long, hooded garment with wide sleeves. Originally it may have referred simply to the hooded portion of a cloak.
If you're referring to The Cowling on and airplane, it's the outside of the engine Metal Case) that protects it from the elements and makes the engine aerodynamic. It also facilitates air-flow into the intake. The cowl panel on an automobile/truck is the area below the windshield.he cowl flap looks like a box scoop that hinges from the front bottom of the nacelle and opens towards the back of the nacelle. The reason for a cowl flap is for engine cooling and to some degree increasing drag. Engine cooling is most important for takeoff, because the engine is working the hardest during this time.