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'[TECH] Fast helicopter 270 knots'
2010\08\17@000740 by RussellMc

face picon face
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_OUTyesTakeThisOuTspamnope9.com> wrote:
> www.zdnet.com/blog/government/sikorsky-flight-tests-a-fast-very-very-very-fast-new-helicopter/9290?tag=nl.e550
>

2010\08\17@012628 by Marechiare

picon face
> 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

The other polish guy deserves to be mentioned as well:
http://en.wikipedia.org/wiki/Frank_Piasecki
http://en.wikipedia.org/wiki/Piasecki_X-4

2010\08\17@061757 by RussellMc

face picon face
> 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

2010\08\17@070551 by RussellMc

face picon face
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

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