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DS Record pushed to 445mph!!!

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Dynamic Soaring World Record

Dynamic Soaring World Record

broken again! - 25/5/10

Slopetrashuk23/05/2010 08:39:12
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John Buxton (California) flew a stock 100" span moulded Kinetic to a speed of 445mph yesterday at Lake Isabella to set a new world Dynamic Soaring speed record.
More details in my RCM&E slope column soon.
 
Andy
Chris Card23/05/2010 09:25:17
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It's amazing how much energy can be extracted from the air.  Is there a theoretical upper limit to the speed a model could DS at, wing and wind willing?
Doug Ireland23/05/2010 12:20:11
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Any idea how much "g" they pull in the turns? I tried watching a video of DS once, made me dizzy!
Stefan Hafner23/05/2010 13:07:32
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Very impressive, must take some serious reactions to be able to keep up with them
 
I think the limits are going to be things like compressability rather than the strenght of the plane, as 445 is just short of mach 0.6, at which point in aircraft design its necesary to start considering compressability effects, and drag will start to increase very quicly so it'll be a lot harder to go faster...... just thinking about it from an aero students point of view here
Jonathan Lewzey23/05/2010 14:02:37
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blimey, thats quick!
Dave Towell23/05/2010 17:58:02
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OMG!! that is just a bit on the quick side!!!
twinstar23/05/2010 20:20:41
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good god, easyglider fliers everywhere beware !!
Stefan Hafner23/05/2010 21:00:26
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Posted by twinstar on 23/05/2010 20:20:41:
good god, easyglider fliers everywhere beware !!

 Like a hot knife through butter ..............

David perry 124/05/2010 09:36:43
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Posted by Stefan Hafner on 23/05/2010 13:07:32:
Very impressive, must take some serious reactions to be able to keep up with them
 
I think the limits are going to be things like compressability rather than the strenght of the plane, as 445 is just short of mach 0.6, at which point in aircraft design its necesary to start considering compressability effects, and drag will start to increase very quicly so it'll be a lot harder to go faster...... just thinking about it from an aero students point of view here

 Aye, but there's the challenge!  Overcome flutter, mach tuck and shockwaves and BANG!!  One Mach 1 glider!  I suspect we'll have to see swept wings first though.

 
Oooo its exciting! 
 
Slopetrashuk24/05/2010 11:12:47
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Video should be uploaded soon.
 
Watch this space.
 
Andy
Lee Smalley24/05/2010 12:56:33
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i would not bother at that pace you aint gonna see much
 
Slopetrashuk24/05/2010 13:12:44
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Oi Smalley - Back in yer box....Shouldn't you be fixin' things.
Ed Anderson24/05/2010 22:09:39
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I wonder what the servo draw is on the battery.  At those speeds the force on those flying surfaces must be high.    No HS-55 servos on that elevator!
Andy Burgoyne24/05/2010 23:30:52
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Ummmm its not a video for the record books to be honest
Slopetrashuk25/05/2010 01:12:56
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A big download, but it is here for anybody interested: http://rcspeeds.com/pilot.aspx?p=26
 
we're assured a smaller version will be on you tube at some point.
 
Andy
Doug Ireland25/05/2010 10:24:54
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It took forever to download and was a bit disappointing to be honest!
Lee Smalley25/05/2010 12:51:21
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smalley closes box sets to work with the cyno and watches the vid after waiting for half an hour to download 
 
Simon Chaddock25/05/2010 15:24:04
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The concept of non powered flight at these speed is most impressive, especially when you think of all the trouble they had to go to exceed 400mph with the most powerful engines then available (Supermarine S6B with a Rolls Royce R).
The real question is how 'sustained' is this speed.
The average speed round the loop & back to the starting point would to me be technically more interesting although from the DS videos I have seen it would still be staggeringly high.
 
Andy Burgoyne25/05/2010 16:19:25
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This may show the sustainability of the speed better
                                                                                                                                                                                                                              DS Acro Weldon


Edited By Andy Burgoyne on 25/05/2010 16:39:29

BB25/05/2010 16:48:36
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BB
Thing whips round like a 'Banshee' !
(Click to enlarge)
 

Edited By Basildon Biggles on 25/05/2010 16:50:07

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