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Originally posted by xtremist
They have a silence mode where they push a button and the engine goes silent.
Originally posted by Seadud
I don't think noise reduction can be done by sending out the negative of a sound. In school we ran a computer simulation where we placed 2 speakers directly in front of each other. The 2nd speaker produces the negative of the first one.
We saw that it depends on your position from where you are listening. In some places you can barely hear the sound, in other places the sound is amplified. Because sound travels in every direction, you can't cancel the sound in every direction.
I would go for air compression to solve this problem.
Originally posted by Maddas
The only switch in a helicopter that I am aware off that will silence it is labled OFF or kill. There is only one proplem in using this device. The motar will stop and the craft will generally 'glide' to the ground as only a helicopter can. Sprial may be a better word fall also come's to mind.