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
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Dive brake is always a great word to know.
So is shear modulus. Does it mean:
coefficient of substance's elasticity expressing ratio between shearing stress and shearing strain
force per unit area
Collins
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

Collins English Dictionary - Complete & Unabridged 10th Edition
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