"G.R. Patterson III" wrote in message
...

Stefan wrote:

Effective mufflers already exist, three or
four blade props already exist, and it make a huge difference without
any negative side effect.

They reduce power, add drag, weigh more, and are very expensive. I call
those *big*
negative side effects.

http://www.newpiper.com/FlyerArticleMarch04.pdf

Have a read of the section "Quieter Warrior".

The "expensive" bit is right though!

Paul