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#11
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#13
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The Enlightenment wrote: (WaltBJ) wrote in message . com... For one, I can see that the cyclic pitch control system is not a simple setup. In essence you need two sets of them, one for each rotor, and with modern helicopters you need a double set of hydraulic actuators, and some way to get the controls to the top rotor actuators. So - $$$$$. Walt BJ Personaly, from an aestheic point of view, I prefer intermeshing rotors. You avoid the complexities of a tail rotor and a coazial linkage in a coaxial rotor. They used to be quite common: Pieseki I think, Kaman and I think the Germans had a little intermeshing Focker anti submarine unit in service in WW2 circa 1943/44. What happened? Kaman still builds a helicopter with intermeshing rotors: The Kaman K-max, specifically designed to carry underslung loads for logging and construction work. It has also been evaluated by the US Navy for use in VERTREP missions and AFAIK Kaman is currently planning an unmanned version for military work. The German helicopter with intermeshing rotors was most likely the Flettner Kolobri. The helicopters designed by Focke (not Focker) used non-intermeshing twin rotors (side by-side). BTW Fokker (also not Focker) never nuilt helicopters and at the time of WW II had moved his business back to The Netherlands. Regards, Ralph Savelsberg |
#14
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BTW Fokker (also not Focker) never nuilt helicopters and at the time of
WW II had moved his business back to The Netherlands. Regards, Ralph Savelsberg Fokker does now as a contributing partner to the NH-90: ww.globalsecurity.org/military/world/europe/images/nh90-731.jpg Rob |
#15
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#16
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BTW Fokker (also not Focker) never nuilt helicopters and at the time of
WW II had moved his business back to The Netherlands. Regards, Ralph Savelsberg Fokker also had the XA-7 aircraft prototype for the US: http://www.wpafb.af.mil/museum/resea...k/a2/xa7-3.jpg Rob |
#17
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robert arndt wrote: BTW Fokker (also not Focker) never built helicopters and at the time of WW II had moved his business back to The Netherlands. Regards, Ralph Savelsberg Fokker does now as a contributing partner to the NH-90: ww.globalsecurity.org/military/world/europe/images/nh90-731.jpg Rob Fokker, as in Anthony Fokker, never built helicopters. The few remnants of his once thriving company, which although it built rather nifty airliners had financial trouble and ultimately went bankrupt sometime in the `ninetees, indeed survive by working as sub-contractors for various projects, including on the NH-90. Saying that Fokker builds Helicopters is like saying Messier-Bugatti builds planes (for those of you who don't know, they do hydraulics for landing gears, for instance). Regards, Ralph Savelsberg |
#18
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robert arndt wrote: BTW Fokker (also not Focker) never nuilt helicopters and at the time of WW II had moved his business back to The Netherlands. Regards, Ralph Savelsberg Fokker also had the XA-7 aircraft prototype for the US: http://www.wpafb.af.mil/museum/resea...k/a2/xa7-3.jpg Rob Indeed Fokker's company, after returning to the Netherlands from Germany post WW I, sold quite a few planes outside of the country. My remark was merely intended to point out that the German Focker helicopter (sic.) referred to by an earlier had nothing to do with the Fokker company in The Netherlands. Regards, Ralph Savelsberg |
#19
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Ralph Savelsberg wrote in message ...
robert arndt wrote: BTW Fokker (also not Focker) never built helicopters and at the time of WW II had moved his business back to The Netherlands. Regards, Ralph Savelsberg Fokker does now as a contributing partner to the NH-90: ww.globalsecurity.org/military/world/europe/images/nh90-731.jpg Rob Fokker, as in Anthony Fokker, never built helicopters. The few remnants of his once thriving company, which although it built rather nifty airliners had financial trouble and ultimately went bankrupt sometime in the `ninetees, indeed survive by working as sub-contractors for various projects, including on the NH-90. Saying that Fokker builds Helicopters is like saying Messier-Bugatti builds planes (for those of you who don't know, they do hydraulics for landing gears, for instance). Regards, Ralph Savelsberg On small historical correction Ralph. Anthony Fokker, together with Stork, helped build the Baumhauer helicopter in 1925. It was the Netherlands first helicopter. Rob |
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