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#1
12-10-2007, 07:22 PM
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X-49A SpeedHawk
Hi all,
I knew about some of the history of this concept, the new issue of Rotor&Wing has a whole artible on this bird. http://www.piasecki.com/pdfs/X-49APR062807.pdf http://www.defensereview.com/modules...print&sid=1061  http://www.aviationtoday.com/rw/issue/cover/17380.html   Anyone care to tackle this one? Of course you can start with a Black Hawk base, and expand from there Rick
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"Rock is Dead, Long Live Paper and Scissors" International Paper Model Convention Blog http://paperdakar.blogspot.com/ "The weak point of the modern car is the squidgy organic bit behind the wheel." Jeremy Clarkson, Top Gear's Race to Oslo 
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#2
12-10-2007, 07:39 PM
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Hasn't this been tried before??!!
Cheyenne??!! Well I guess it was a gun ship design, not a transport.
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#3
12-10-2007, 08:29 PM
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yes that is what has been mentioned in one of the articles I linked
but what the Cheyenne had, a pusher prop, the SpeedHawk has a ducted fan prop, from what I have read, and I haven't finished it yet, the ducted fan allows for a more level flight, less nose down attitude, for the Navy this is interesting, because when towing a Antimine sled the helo will nose down, and that might be problematic Rick
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"Rock is Dead, Long Live Paper and Scissors" International Paper Model Convention Blog http://paperdakar.blogspot.com/ "The weak point of the modern car is the squidgy organic bit behind the wheel." Jeremy Clarkson, Top Gear's Race to Oslo
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#4
12-10-2007, 10:50 PM
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Well I guess I should have read them:o I'll check them out tomorrow at lunch time at work:D
The ducted fan tail I bet does give better performance........... but it still looks kinda funky on an otherwise sleek looking helicopter.:p
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#6
12-11-2007, 11:53 AM
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Rick,
Just read the links and boy.............. deja vue all over again! Can you say......... Northrop Flying Wing and B-2 Spirit.............................. Why do we have to keep coming back to good ideas instead of working on the original and fixing the bugs.............yeah I know hindsite 20/20. Where would Helicopters be now if this had been adopted almost 40 years ago when it first flew? john
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#7
12-11-2007, 12:02 PM
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Interesting bird for sure!
Quote:
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-Dan
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#8
12-11-2007, 03:05 PM
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Here's a video of the Speedhawk. Nice sounding bird.
http://www.youtube.com/watch?v=Vk5sB...eature=related Rick tells me this video was shot at his hometown airport. Got a bit of a PM connection there...hehehe.
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Ashrunner "If you don't know what a lahar is, don't get in its way!" My Designs -- My Photography
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#9
12-11-2007, 03:57 PM
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The tips on these helicopters reach nearly supersonic and if that happens they generate no life. The Carter copter design slows down the main rotor so that at higher speeds the rotor can provide life while not allowing the advancing blade to exceed the threshold that would reduce lift. If the issue of blade stalling is not addressed then "pushing" it faster would offer not any advantage. The Sikorsky ABC had the most rigid blade system ever produced and had 2 Huge Pratt and Whitney's to push it to world record speeds. The future is here, IMHO.
http://www.flightglobal.com/articles...elicopter.html http://gizmodo.com/gadgets/notag/sik...ter-269723.php
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