dive brake

dive brake

noun Aeronautics.
a flap deployed from the wings or fuselage of an aircraft, as a dive bomber or sailplane, that increases drag to permit a relatively steep angle of descent without a dangerous buildup in speed.

Origin:
1935–40

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World English Dictionary
dive brake
 
n
1.  a flap or spoiler extended from the wings of a ground-attack aircraft for controlling a dive
2.  another name for air brake

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