differential wind

differential wind

[‚dif·ə′ren·chəl ′wind]
(ordnance)
In bomb ballistics, the vector difference between the wind at the bomb-release altitude and the wind at some other specific lower altitude; differential winds are required for the computation of the differential ballistic wind.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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Similar considerations apply to wind turbines mounted on ships to generate electric power, says the report, in that they require an adequate differential wind speed over the turbine rotor.
Navigating an alternative course: although the pressure is on for shipping to reduce emissions, there seems to be a surprisingly low level of activity in the area of renewable marine propulsion

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