Comments on: Sikorsky counterrotating helicopter takes flight http://blogs.law.harvard.edu/philg/2008/08/28/sikorsky-counterrotating-helicopter-takes-flight/ A posting every day; an interesting idea every three months... Sat, 28 Nov 2009 19:06:48 -0500 http://wordpress.org/?v=2.8.4 hourly 1 By: SuperCorgi http://blogs.law.harvard.edu/philg/2008/08/28/sikorsky-counterrotating-helicopter-takes-flight/comment-page-1/#comment-86197 SuperCorgi Fri, 29 Aug 2008 18:39:32 +0000 http://blogs.law.harvard.edu/philg/?p=1072#comment-86197 And there is also the unloaded / slowed rotor at cruise type helicopters, that Jay Carter has done a lot of promising work with. With our tax money. For a good return. http://www.cartercopters.com/ I rather like the weighted rotors, gives obviously lots of sustained energy in an autorotation event, or the neat *hop off* takeoff these sort of gyro designs have. And there is also the unloaded / slowed rotor at cruise type helicopters, that Jay Carter has done a lot of promising work with. With our tax money. For a good return.

http://www.cartercopters.com/

I rather like the weighted rotors, gives obviously lots of sustained energy in an autorotation event, or the neat *hop off*
takeoff these sort of gyro designs have.

]]> By: philg http://blogs.law.harvard.edu/philg/2008/08/28/sikorsky-counterrotating-helicopter-takes-flight/comment-page-1/#comment-86138 philg Fri, 29 Aug 2008 03:00:23 +0000 http://blogs.law.harvard.edu/philg/?p=1072#comment-86138 Brandon: I don't think that the helicopters you cite get into retreating blade stall or cruise especially fast. They look like the Kaman (Connecticut designed and built) heavy lift helicopters where the counter-rotating main rotors are there to maximize power available. Wikipedia has the maximum speed on a ka-26 as 100 mph, i.e., slower than a Robinson R22! Maybe http://en.wikipedia.org/wiki/Kamov_Ka-50 is the interesting one, with a cruise speed of 204 knots. Brandon: I don’t think that the helicopters you cite get into retreating blade stall or cruise especially fast. They look like the Kaman (Connecticut designed and built) heavy lift helicopters where the counter-rotating main rotors are there to maximize power available. Wikipedia has the maximum speed on a ka-26 as 100 mph, i.e., slower than a Robinson R22!

Maybe
http://en.wikipedia.org/wiki/Kamov_Ka-50 is the interesting one, with a cruise speed of 204 knots.

]]> By: Brandon http://blogs.law.harvard.edu/philg/2008/08/28/sikorsky-counterrotating-helicopter-takes-flight/comment-page-1/#comment-86137 Brandon Fri, 29 Aug 2008 02:45:59 +0000 http://blogs.law.harvard.edu/philg/?p=1072#comment-86137 850 Kamov Ka-26s, and at least a couple hundred Ka-25s and variants isn't large scale production? 850 Kamov Ka-26s, and at least a couple hundred Ka-25s and variants isn’t large scale production?

]]>