NACA duct

A NACA opening is a streamlined air inlet in the outer skin of vehicles. Due to the sloping edge vortices are generated that displace the slow boundary layer flow. Therefore, they can be made small for a given air flow and increases the air resistance is little. The flat einmodellierte in the skin opening was developed by the NACA for the intake air from jet engines, but only used few early jet aircraft. The strong engines of supersonic aircraft need large inlet openings that can not be fit smoothly into the hull surface.

In the automotive industry the NACA opening was first used in racing cars and led cooling air intake or zoom for the motor. Later, from the mid-1960s they were also used in production vehicles such as the Shelby Mustang, Alfa Romeo Montreal, Chevrolet Camaro Z28 and Porsche 924 Turbo.

Early 1980s were offered as a retrofit kits in the car accessories market NACA air vents and air scoops. These attachments often served only the sporty appearance.

• Automotive design
• Intake tract
• Body