Post by thread:[TECH] Fast helicopter 270 knots

Impressive. Probably impractical for general use. Leading blade approaches SOS somewhat. Speed from rear prop propulsion. Aerodynamics from rotor control magic. July 26 www.sikorsky.com/About+Sikorsky/News/Press+Details?pressvcmid=a4a2962fa4f0a210VgnVCM1000004f62529fRCRD July 21 www.sikorsky.com/vgn-ext-templating-SIK/ctrndr?vcmid=9ed2aa9b531f9210VgnVCM1000004f62529fRCRD&siteName=Sikorsky May 25th www.sikorsky.com/vgn-ext-templating-SIK/ctrndr?vcmid=cafeb0da24fc8210VgnVCM1000004f62529fRCRD&siteName=Sikorsky Feb 23rd http://www.sikorsky.com/vgn-ext-templating-SIK/ctrndr?vcmid=6245b729564af110VgnVCM1000004f62529fRCRD&siteName=Sikorsky 2006 Q2 Sikorsky military newsletter - some great pictures of other craft. See p3 re X2 http://www.sikorsky.com/StaticFiles/Sikorsky/Assets/Attachments/NEWSLETTER/military/mil_2006_q2.pdf On 17 August 2010 10:47, YES NOPE9 <spam_OUTyesTakeThisOuTnope9.com> wrote: > www.zdnet.com/blog/government/sikorsky-flight-tests-a-fast-very-very-very-fast-new-helicopter/9290?tag=nl.e550 >

> with koaxical rotor the helicopter (almost) have no speed limit... You don't want the combined (blade_tip_velocity + ground speed + head_wind_speed) to approach "too close" to the speed of sound. Russel

Blackhawks (one of the many many variants thereof) are now being made in Poland. http://www.pratt-whitney.com/StaticFiles/Sikorsky/Assets/Attachments/NEWSLETTER/military/Frontlines_Q1_2010_issue19.pdf The world has in some ways come a long long long way from how it was in my earlier years. But alas (not at all unexpectedly) in many ways it's the same world with different slants on things. Russel