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noise

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russ(at)rkiphoto.com
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Posted: Thu Jun 26, 2008 1:27 pm Post subject: noise

In re noise -- I think everyone would like to have a quieter plane,  

whether it affects their flying permissions or not.

I recall the Lockheed 'quiet plane' they developed for Vietnam use.  

It was  astonishingly quiet, mainly due to a huge slow-turning  

tractor prop on a shaft above the fuselage. Kolbs can't do that; no  

help there.  But the exhaust was fairly large in diameter and aimed  

upward. I read that one Kolb installation had the exhausts aimed up  

and FORWARD. I'd think that would produce too much back-pressure, but  

if it works?

They've done a lot of things with 'tuned exhausts' on VW dune buggies  

-- that might be close enough to have some practicality for kolbs .  

Who's got some experience  here?

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