Possibility of ascertaining ground speed by echo of sound is investigated; it is suggested that instrument be designed to measure time taken in flight between emission from airplane of sound impulse at angle to vertical and return of that sound to plane after reflection from ground. (See also - discussion n 1714 Mar 31 p 364-5)
Sound speed -- Ground speed
Aeroplane
Aeroplane ; 66 , n 1706
1944
Aufsatz (Zeitschrift)
Englisch
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Sound speed profile interpolation
British Library Conference Proceedings | 1993
|SAE Technical Papers | 1991
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