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Nov 20, 2008, 01:36 PM
Just Fly it
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Dynamic Soaring

I have not been able to maintain this site very well lately, and for this reason refer all to
Last edited by Indubitably; Feb 07, 2011 at 01:16 AM. Reason: Change in World Speed Record
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Dec 13, 2008, 10:00 PM
Just Fly it
Thread OP
For a list of speeds,,
Last edited by Indubitably; Feb 06, 2011 at 10:03 AM.
Apr 13, 2011, 08:04 PM
Registered User

Dynamic Soaring Animation


since this is asked from time to time, I made an animation that explains the physics of dynamic soaring in simple terms:


The target audience are laymen who just want to know how it works. So it intentionally doesn't go into fluid mechanics and how to achieve the best performance in real world, but rather tries to explain the core principle by analogy to a simpler mechanism.
Last edited by eyytee; May 15, 2011 at 12:19 PM.
Mar 16, 2012, 05:25 AM
Matt Galland's Avatar
Nicely done!
Mar 17, 2012, 09:12 AM
quickee's Avatar
Dec 21, 2013, 12:01 PM
Apr 09, 2015, 11:15 PM
Registered User
ah ………………..exellent
Apr 20, 2015, 06:25 AM
Registered User
Thank for sharing.

บาคาร่า Holiday
Nov 08, 2015, 04:36 AM
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minirotor's Avatar
Has anybody flowen with onboard GPS telemetery to show apx what are the speeds around in a circuit[for any given wind speed]
Given that they usually increase slowly with each circuit[if you can keep up a good even circuit patten all the time]

I always suspected we had more speed going down the hill[but we usually only measure coming up the hill]

Nov 08, 2015, 04:45 AM
Matt Galland's Avatar
I think mikethesnake tried this years ago. The problem is the GPS sampling rate and accuracy. If you can solve for those your idea would certainly work.
Nov 08, 2015, 06:08 AM
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minirotor's Avatar
Originally Posted by Matt Galland
I think mikethesnake tried this years ago. The problem is the GPS sampling rate and accuracy. If you can solve for those your idea would certainly work.
I was not thinking of accerate readings...only the differance between readings during a circuit to improve areas of speed loss.
Could be done with actual airspeed telemitary as starters I guess.

Talks abound now as to wheather its possible to go much faster as we approach the sound barrier????

But it would be interesting to see how fast a (ex) K130 would go if dropped virtically from say 5-10thousand feet(with outopilot and actual airspeed telemitary).
Good pub argument.

Nov 08, 2015, 07:44 PM
Wind, hill, ... I'm keen ...
AvB's Avatar
In one of those really great old videos (was it "Endless Lift"?) Joe Wurts is explaining DS and how he specked out his slope plane at Parker and dived it vertically at the hill, and got a speed of (I'm guessing) 130mph on the gun. Then pulled a full elevator turn, the wings bent, and the plane shot up again. He then dropped it over the back, started DSing circles, got something like 165mph and the wing blew up. This for many people was the "Ahah!" moment when they conceded that there really was something going on with DS.
Nov 08, 2015, 08:28 PM
Crashing is not a crime
Aerogance's Avatar
Yeah, high speed DS really only begins when you exceed terminal velocity. Then it is starting to get serious.
Nov 09, 2015, 03:52 PM
the occasional flyer
rothlisburger's Avatar
I'm guessing that you can't reach the terminal velocity by a vertical dive after specking out. Neglecting friction, it would take about 1000 ft drop to reach 150 mph. With friction, you'd need to be higher before you hit 150. How high before you can't you see the plane?

Plus, I suspect that terminal velocity for a slippery ship is higher than 150, given that a skydiver with arms and legs hanging out is about 130.

But on a good day, you can hit 150 on the first DS lap.

But more to the point, there are pilots who fly with data loggers. Here's one thread.

Last edited by rothlisburger; May 27, 2016 at 12:07 PM.
Mar 09, 2016, 08:44 PM
Registered User

I have very limit to go here,but once i have time,i will.

I love this forum.

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