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#1
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Osprey tested in air, at sea, but not in vortex ring state.
http://www.signonsandiego.com/news/m...cnsosprey.html
"They decided not to finish a second phase of vortex ring state testing." -HJC |
#2
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That (your subject line claim) is not what it says. You are mistaking the
questionable claim from a former OT&E guru as meaning that the aircraft was not tested in vortex ring state conditions, which just ain't the case. "...has proven its ability to function safely in potentially deadly rapid descent conditions, the government's top test pilot said...Gross said they have completed the tests necessary to document the tilt-rotor's response to the dangerous vortex ring state condition that rotary wing aircraft encounter when descending too quickly at low airspeed...Gross and other members of the Osprey test team have said the tilt-rotor encounters vortex ring state at much higher rates of descent than helicopters and recovers better because it can move the rotors forward to quickly gain airspeed..."We believe we have explored this enough," Gross said. If you are going to try to summarize the gist of the article in your header, at least get it right. Brooks "Henry J. Cobb" wrote in message om... http://www.signonsandiego.com/news/m...cnsosprey.html "They decided not to finish a second phase of vortex ring state testing." -HJC |
#3
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"Kevin Brooks" wrote in message t...
That (your subject line claim) is not what it says. You are mistaking the questionable claim from a former OT&E guru as meaning that the aircraft was not tested in vortex ring state conditions, which just ain't the case. I don't see any mention that they ever actually went into full vortex ring state. What they need to do is send an unmanned Osprey up to say 10k feet, put it into VRS and have it automatically recover until the software is solid. Then you don't have to worry about the pilot reacting in time, the aircraft will rotate the engines forward and scoot out of trouble on it's own. -HJC |
#4
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#5
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"Henry J. Cobb" wrote in message om... "Kevin Brooks" wrote in message t... That (your subject line claim) is not what it says. You are mistaking the questionable claim from a former OT&E guru as meaning that the aircraft was not tested in vortex ring state conditions, which just ain't the case. I don't see any mention that they ever actually went into full vortex ring state. You should reread your article, then. What they need to do is send an unmanned Osprey up to say 10k feet, put it into VRS and have it automatically recover until the software is solid. Then you don't have to worry about the pilot reacting in time, the aircraft will rotate the engines forward and scoot out of trouble on it's own. Why? Other (conventional) rotary aircraft currently within operating inventopries are susceptable to VRS and manage to handle it by knowing the limits--why do you think the V-22 should somehow be different? Illogical. Brooks -HJC |
#6
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In article ,
Hobo wrote: In article , "Kevin Brooks" wrote: Why? Other (conventional) rotary aircraft currently within operating inventopries are susceptable to VRS and manage to handle it by knowing the limits--why do you think the V-22 should somehow be different? Illogical. It's not illogical if the V-22 is so much more susceptible to this that the frequency of occurence during routine use is far greater than normal helos. But that's the thing. It's not. It's just that they were trying something *very* far off normal flight regimes, and it bit them. Most copters damn near have to have their rotors fall off to get that sort of sink rate. -- cirby at cfl.rr.com Remember: Objects in rearview mirror may be hallucinations. Slam on brakes accordingly. |
#7
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"Hobo" wrote in message ... In article , "Kevin Brooks" wrote: Why? Other (conventional) rotary aircraft currently within operating inventopries are susceptable to VRS and manage to handle it by knowing the limits--why do you think the V-22 should somehow be different? Illogical. Brooks It's not illogical if the V-22 is so much more susceptible to this that the frequency of occurence during routine use is far greater than normal helos. But apparently it is not "so much more susceptable" to it. Brooks |
#8
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In article ,
Hobo wrote: That Arndt guy won't even claim the Germans did it first. Actually, he did that a couple of weeks ago. -- cirby at cfl.rr.com Remember: Objects in rearview mirror may be hallucinations. Slam on brakes accordingly. |
#9
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"Hobo" wrote in message ... In article , "Kevin Brooks" wrote: But apparently it is not "so much more susceptable" to it. Brooks What I have heard is that using smaller than normal rotors makes it more susceptible than normal. Regardless, it has already killed over 20 people and no US service other than the Marines wants it Not true. The USAF is still anxious to get the Osprey into its special operations force, and we have had recent reports of interest from the National Guard Bureau in obtaining Ospreys for the homeland defense role. A very brief review of available web resources via Google will verify that your statement is patently false. and no foreign country will take it even as a gift None have been offered. and there is zero commercial interest in the technology. Really? Last I heard the joint Agusta Bell AB 609 civil spinoff had gained some seventy advance orders, and made its maiden flight this past March. So far you are exhibiting a very low batting average in terms of accuracy of your statements regarding this program. http://www.bellhelicopter.textron.co...r_0307001.html That Arndt guy won't even claim the Germans did it first. Have you been sleeping of late? He recently actually did exactly that. Another less than accurate statement you have left with us... Brooks |
#10
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"Kevin Brooks" wrote in message et...
Why? Other (conventional) rotary aircraft currently within operating inventopries are susceptable to VRS and manage to handle it by knowing the limits--why do you think the V-22 should somehow be different? Illogical. http://198.65.138.161/military/syste...t/v-22-vrs.htm "This asymmetrical VRS phenomenon, which is unique to side-by-side rotor configurations, will have the initial resultant effect of inducing a large rolling moment in the yaw direction." That's what's different about it. -HJC |
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