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Message: <blockquote data-quote="Lauge" data-source="post: 60788" data-attributes="member: 1154">I would also submit that it depends on what kind of "stealth" you want. Do you want to conceal the fact that an aircraft is operating in the area, or do you "just" want to make it harder to pinpoint exactly where ?As an example, I've been in close proximity to an AS550 Fennec light helicopter, operating at low altitude and taking appropriate cover behind terrain and trees about half a mile from our position. Could we hear it ? You betcha. Could we tell where the sucker was at ? No dice. BTW, it's the same thing with an MBT. Lots of noise, but non-directional. It's spooky to know that there's a 60 ton tracked vehicle with a big gun in the area, but not knowing where.....  <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite7" alt=":p" title="Stick Out Tongue    :p" loading="lazy" data-shortname=":p" />But if you want "weally, weally quiet", you need some more advanced stealth technology. With a rotorcraft, I would assume you could reduce noise (or at least change it enough that it doesn't sound like a rotorcraft) by reducing rotor speed. With all the technological challenges that carries with it.Regards & all,Thomas L. NielsenDenmark</blockquote>