[TR] Exhaust notes (off topic?)

John Herrera jrherrera90 at hotmail.com
Wed Nov 7 14:12:40 MST 2007


>About 25 years ago I attended an air show at Oceana Naval Air Station that
>included lots of old war birds. I stayed around as long as possible after
>the show and got to hear a B-25 start up from close range before it took
>off. What an awesome sound!!

B-25s have a great exhaust sound! I think that this is because they don't 
use a turbosupercharger, which acts as a muffler. A B-17 is much more quiet 
and I think that this is because it uses a turbosupercharger as well as a 
gear-driven supercharger.

Not to kill anyone's buzz, but lots of the sound an aircraft makes on 
take-off comes from the prop. Especially when it's coming towards you and is 
loudest when you are in the plane of the prop. As it goes past, you hear 
more exhaust note.

The blaaatting sound a T-6 makes on take-off is from the prop tips nearing 
the speed of sound. Like lots of little sonic booms as the prop turns.

Sorry to put a technical spin on the subject of cool exhaust notes.

John


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