Aeronautical Engineering/Noises From Airplanes

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Expert: - 6/30/2009


Question
Hello Paul
Following up my questions, if we can not eliminate noises so how we couldn't hear spy planes flights?
Thanks

Answer
Your question is a little unclear.  I believe you are asking why is it that you cannot hear spy planes.  To answer that I would need to know more about the planes, but I assume that a small, light, low-speed aircraft designed for low noise would be difficult to hear beyond a certain distance.  For example, a low-speed propeller with many blades can be very quiet, and a gas engine can be muffled.  That is a lot different from the 747 type aircraft you asked about before.

Aeronautical Engineering

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Paul Soderman

Expertise

Aeronautics, Fluid Mechanics, Aeroacoustics, Noise Control, Muffler Design, Wind Tunnel Research.... I know nothing about India - do not ask about schools, jobs, application requirements, career choices, etc. for India. Please, no text message verbiage; I prefer full words in full sentences. Thanks.

Experience

38 years as research engineer at NASA

Publications
AIAA, NASA

Education/Credentials
B.S. and M.S. Aeronautical Engineering - U. of Washington Graduate work Standford U.

Awards and Honors
AIAA Associate Fellow (American Institute of Aeronautics and Astronautics)

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