Re: Engine noise question

Date:         05 Dec 96 02:27:20 
From:         GWilson404@aol.com
References:   1
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In article <airliners.1996.2574@ohare.Chicago.COM>, jcb@interlog.com (Jeff
Bowen) writes:

>Is the whine a mechanical sound (turbines or something) of metal
>parts rubbing on one another?  Is the roar the actual sound of
>combustion or of air rushing over the metal surfaces of the
>engine?

Right in one. The whine is generally fan noise and the roar is jet noise or
the noise of the airframe itself.  It will depend on the type of engine and
where you are relative to the aircraft. It is very instructive to listen to
an aircraft as it taxis around an airfield apron, and you hear the change of
noise type and level as changes its orientation.

Gerald Wilson.