Quote:
Originally Posted by Rekraps
The drone is simple resonance, that is frequency matching caused by natural vibrations of the engine, exhause gas and exhaust pipes. I submit that a simple change in the diameter of the piping, more or less, will eliminate the drone. Aircraft designers, bridge builders and any other structure is always designed with resonance in mind. Eventually it will damage or destroy the integrity of the material to which it impacts. Tightening the pipes will not help, wrapping them will only hide or surpress the noise, in order to make it go away the actual resonance needs to be cancelled. Think about two waves joining in sync... they get bigger. Now those two same waves can also cancel each other out. That is what you want. So... the natural vibration frequency of the engine at the point you hear the drone, just happens to match that of the exhaust piping. You would have thought the M team would have considered normal cruising RPM and adjusted the piping size accordingly.
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Quote:
Originally Posted by 1SerieStud
Nope. Changing the diameter of the pipe will simply move the resonance frequency.
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I would think that's what he meant by eliminate - eliminate from cruising speed.
Unfortunately, they probably only have Germany's cruising speed in mind where there is no drone.