Conventional turbo-shaft engines aren't quieter with these thecnology because it
noise has different origin (the turbine blades in some ways), the case of the
ramjets is differnt, in this case the technology is aplicable, but not easy to
"fine tune", and the plasma machines hads lows MTBF.

This is not the only way to reduce the noise of the engines, other techonology
is the active noise canceling using small piezo electric flaps on the gas
stream, this could be used into the engines and on the rotors (Boeing Vertol and
Eurocopter are working on it right now, GE and P&W also does research on this
technology).

Regards,
JAngel

"sanman" escribió en el mensaje
om...
| Here's an article:
|
| http://www.newscientist.com/news/news.jsp?id=ns99996073
|
| So if plasma reduces jet noise, then can it reduce turbine noise?
|
| There are gyroplanes like the one made by Groen Bros, and also the old
| Fairy, which used ramjets on the rotortips to boost rpm and lift
| during takeoff, but this caused terrible noise problems. Could this
| plasma noise-deadening approach make the ramjet rotor-assist more
| practical and feasible?