P� 26. okt. 2004 kl. 18.37 skrev Mark Roberts:
"D. Glenn Arthur Jr." <[EMAIL PROTECTED]> wrote:
Jostein wrote:IIRC, the altitude where jumbo jet pollution happens offsets the
efficiency. The same amount of exhausts do a lot more damage up there.
Which reminds me ... Are fighters actually much louder than jetliners, or is it just that when they pass over my house they do so at a much lower altitude than jetliners do?
They're probably louder. Fighters are powered by straight turbojets rather than high-bypass fanjets. Also, being rather, ah... utilitarian, in design, fighters have little devoted to noise abatement technology for its own sake ;-)
In some engines used by airliners they have shifted the intensity peak of the acoustic energy down into the infra sound range, so you can feel it more than you can hear it. Some say that it does more harm there, but you don�t notice it the same way.
DagT
