Frequently Asked Questions
Is it possible to make a chopper "quiet" ? So you only hear him when he's just right above you. Often seen it in action movies - but is it possible?
There is no button to activate a "quiet mode" ;-) but there are technologies such as canted rotor blades, offset pairs of blades, shrouds for exhausts, etc, that cut the noise level by as much as half or more.
The NOTAR ( see the how fly? and Mc Donnell Douglas/Boeing sections ) is one of the quietest of all -- eliminating the tail rotor and its 360-degree pattern of noise dispersal literally removes one entire sound source.
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