Word: levavasseur
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...Fiddle on Top. Building a lightweight, sound-controlled rocket will not be easy. But Acoustica's engineers think that it is certainly possible. For a sound-making device, they intend to use a Levavasseur whistle that has no moving parts and can be made of heat-resistant material. The rocketeers figure that the best frequency to use is 10,000 cycles, about the pitch of a very high violin note. Yet the volume of sound must be well above the loudest fiddle; an ear-shattering 170 decibels, which is 100 times the sound pressure of a supersonic boom from...
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