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Dynamic Soaring

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Figured since I do it, and talk about it, perhaps it would be good to explain what it is, and show some video's.

"Dynamic soaring is a flying technique used to gain energy by repeatedly crossing the boundary between air masses of significantly different velocity. Such zones of high wind gradient are generally found close to obstacles and close to the surface."




Here is myself and Chris flying at his site in Salida last weekend.  Is long, but can give you and idea of what we are doing.



Here we are DSing on flattop:



here is an old world record at 505 mph.  Yes, with a glider.  The sound is simply amazing.



this one is really good because you can hear the noise the plane makes...

 

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The 'latest' design is by Spencer Linsby.   This is the most hopeful to beat the 513 world record.   They hope by a lot.  From Spencer:

"This plane was designed and built for all-out speed while still maintaining a mild mannered easy to fly behavior at frontside speeds. Our goal was to achieve the highest speed possible without resorting to swept wings. As usual, Dirk Pflug provided the airfoils and Thomas Pils provided a huge amount of design work as well as machining the fuselage molds. Jarda did an excellent job making the wing and stab molds in CZ and shipped them to me here in the US. 

Dirk Pflug designed a suite of airfoils which were designed to delay the shock formation as long as possible and minimize the drag divergence up to 580mph. Dirk was also able to get help from Stuttgart University to optimize the wing using MSES. Our hope is that this transonic tailoring will allow the model to maintain a high wind-speed multiple well into the 500+mph range where other models performance drops off more rapidly. Although the airfoils were designed for transonic mach numbers, their performance remains surprisingly good at lower speeds. The 22:1 aspect ratio should also help boost the low speed performance where the airfoils are not in their prime.

The 130" wing on this first prototype is (1) piece for simplicity and the ultimate in strength / stiffness. Production wings will be (3) pieces to facilitate shipping and transportation to the hill. This first model weighs roughly 240oz (6.8kg). That puts the wing loading at approx 45oz/sf (137g/dm^2). Ideal ultimate flying weight will likely be closer to 300oz (8.5kg). "



[vimeo]https://vimeo.com/201396200[/vimeo]

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That is amazing! :thumbs: 

Onward and Upward.
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Unofficial new world record, Bruce Tebo hits 513 mph in California! :o

Onward and Upward.
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He tied Spencer's speed.  So two people have hit 513.

Pretty amazing.
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New world record by Spencer today, with the Transonic.

519 mph.  

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Paul, are you headed for Weldon?

Thermals---I need thermals!
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Am oit here now.  First day flilying today.  Was a blast.  Some very skilled pilots and great flying.  If you look in the flying air isabella thread in da forum ian is posting updates.  They are the most recent posts. 
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You mean the RCGroups slope forum? I don't see an air isabella thread. I think I'm misunderstanding what you mean. 

J

Last edit: by Tippodriver


Thermals---I need thermals!
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 Not yet. Forcast not for anything epic. We are hoping that changes.  Yesterday was a lot of low 200 mph from everyone.  
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What forum are you talking about. RcGroups? Air isabella thread under slope? Couldn't find such a thing.

Thermals---I need thermals!
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Never mind, I found Ian's (Daemon's) post with the day's speeds. I can imagine you are just having an absolute blast being there with all those go fast types.

Thermals---I need thermals!
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Ian and nick are good to watch and learn from.  Marcus from switzerland is a phenominal pilot, he was doinf rolling circle ds laps.  And bruce rebo is just one of the most amazing ds pilots i have ever seen fly.  This is very educational and relaxing


I am ip to 211 mph.  That 48 inch windburner maidened at 163 today.  
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I imagine that flying with those guys is educational. Spending time with people who really know the ropes usually is. Rolling circle DS laps! OMG , that must be amazing to watch. Sounds like you are doing OK for the first time at Weldon.  

Thermals---I need thermals!
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I am holding my own, and am satisfied.  I cant cound the number of 200+ mph laps i have done.  Is great practice and am getting more comfortable.   I have learned to not push it so hard and punch out to relex from time to time, keep fligjts shorter because when building the muscle memory you peek then get worse after not t much time so need a rest. 

Flew my 48" windburner to 184 today.   If it survives the trip it will get a paintjob as its colors now suck.   Lol. 
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