October 2007 Issue

Letters: 10/07

With reference to your article on thicker windshields being quieter in the August 2007 Aviation Consumer, there is a very good reason you could not perceive a reduction in sound after installing a thicker windshield in your Mooney. The human ear cannot perceive a sound level change of less than about 3 dB and [IMGCAP(1)]you were only getting that much reduction in one location. The inability to remember the previous sound level accurately is also a reason, so your measurements are the only way to really tell. By the way, the cockpit noise in a 747 at the ear next to the side window is about 85 dB at cruise.

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