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Old Aug 02, 2013, 12:28 PM
DS will change your life
SpeedsterDEN's Avatar
Danmark, Nordjylland, Sæby
Joined May 2010
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Dsing my thermal glider.

Dune Ds fun with my Arthobby Odyssey 2,7 meter thermal glider.
Wind 8 to 10 knots.
It dont need much Wind to have some DS fun, and a perfekt glider for this windspeed.



DSing my thermal glider. (1 min 40 sec)


Cheers
S
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Old Aug 02, 2013, 01:02 PM
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United States, CA, San Jose
Joined Mar 2012
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You need to DS a thermal itself. Apparently is the revolutionary new way to fly, that world record holders use all the time, yet only one other person seems to know/preach about.
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Old Aug 02, 2013, 04:54 PM
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Joined Jan 2003
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Quote:
Originally Posted by cityevader View Post
You need to DS a thermal itself. Apparently is the revolutionary new way to fly, that world record holders use all the time, yet only one other person seems to know/preach about.
Don't YOU START, now!
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Old Aug 02, 2013, 05:02 PM
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I'm a bit bummed because I've never DS-ed. I've kinda sorta tried before with a Weasel, but I just don't know how to enter the circuit and maintain energy (of course, a Weasel doesn't retain energy either!). Videos are great and all, but until seeing how it's done in person, I won't try again. Not to mention, no good site for it around here.
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Old Aug 02, 2013, 08:59 PM
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United States, OR, Corvallis
Joined Jan 2010
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Dynamic Soaring at the Beach........

SpeedsterDEN- Cool video,

Just to clarify: Is the wind coming off of the ocean and blowing over the dune in an inland direction? And, if that is the case, You are flying in the "rotor"? Yes?

That's pretty cool. Do you think it can be done with a rud/elev polyhedral plane in that particular situation or would it require ailerons (like your plane does as seen in the video).

Thanks - Paul
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Old Aug 02, 2013, 10:17 PM
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See this fabulous explanation, Mr. tadpole, sir, for flying in the rotor.
http://www.rcgroups.com/forums/showp...06&postcount=3
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Old Aug 03, 2013, 02:05 AM
DS will change your life
SpeedsterDEN's Avatar
Danmark, Nordjylland, Sæby
Joined May 2010
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Quote:
Originally Posted by Pauliwog View Post
SpeedsterDEN- Cool video,

Just to clarify: Is the wind coming off of the ocean and blowing over the dune in an inland direction? And, if that is the case, You are flying in the "rotor"? Yes?

That's pretty cool. Do you think it can be done with a rud/elev polyhedral plane in that particular situation or would it require ailerons (like your plane does as seen in the video).

Thanks - Paul
Hi Paul
Yes, the wind coming from the sea side.
And I fly at the backside of the ridge, but there is no rotor if you go Deep enough.
When there is no more wind than this, there is totaly lee behind the ridge and almost no turbolent under the boundary layer
And thats the secret of small dune Dsing.

But when the wind is over around 18 knots, the air will be compressed just over the small ridge, and being sucked down the backside in large rotor, and it is completely impossible to fly.
So the lighter the Wind is, the easier it is to fly DS on a small ridge.

But its easy to see if its safe to fly, just stand behind the ridge and feel the Wind.
If there is lee, then its ok.

And the Wind must be right on the slope otherwise the Wind just creeps over the top and Down at the backside, and there will no lee area behind.


Perhaps it could be done with a fast rudder/elev model, but I would prefer a aileron model.

7 min. session of the flight here:
http://www.youtube.com/watch?v=UMwyYB-NE5o





How to ds:

DS for beginners. (1 min 50 sec)


For slower and lighter gliders, a Sharp ridge top like this one is much better.
And way more easy to fly and get the secret force
Because the turbolent area between the lee and Wind is very narrow, so you dont Loose the speed when flying through a big boundary layer.

Specialy when flying light foamies.

DS combat, With Wiesel (2 min 3 sec)


Wiesel light, dune flying. (2 min 20 sec)


And you dont need a big fancy glider to do it..
20" scratch build.

20" micro DS glider. (1 min 33 sec)


But a fast manoureable thermal glider are perfekt, if you are a real good pilot. Otherwise a fast foamie with ballast will be much better.

99% is to find the right ridge.
Otherwise you must use what you got.

Wiesel light, Sloping and DS (2 min 14 sec)


Even in less Wind speed that you need for normal sloping, its possible to DS:
Magic Dynamic soaring.. (2 min 3 sec)



Just do it...

S

Dynamic soaring will change your life.
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Old Aug 03, 2013, 08:27 AM
DS will change your life
SpeedsterDEN's Avatar
Danmark, Nordjylland, Sæby
Joined May 2010
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Dsing for beginners. (1 min 41 sec)


S
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Old Aug 03, 2013, 11:13 AM
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Speedster - thanks for sharing the cool videos and information on DSing. Haven't tried it, yet. But maybe this afternoon. I have wind, a hill and a plane!
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Old Aug 03, 2013, 12:54 PM
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United States, OR, Corvallis
Joined Jan 2010
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I'm starting to "get it"

Cityevader- Thanks for that video, that's really, as in, REALLY informative and great primer for how to understand how it really works, which totally agrees with everything SpeedsterDen explains.

Oh yeah, Do I know you from Skateboard Slalom Racing? Just curious.


SpeedsterDen- Thanks for more explanations and video footage.

When you say "lee" in regards to the leeward side of a slope, Do you mean "calm air"? If so, this whole Dynamic Soaring is making more sense now.

Thanks to both of you- Paul
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Old Aug 03, 2013, 01:30 PM
DS will change your life
SpeedsterDEN's Avatar
Danmark, Nordjylland, Sæby
Joined May 2010
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Yes when I say lee, I mean the calm air behind the ridge.

My Dynamic soaring explayning:


1, Wind 20 miles
2, Gliders speed 20 miles
3. Total calm air behind the ridge.

Glider fly over the ridge against the Wind (airspeed 20 miles, groundspeed 0 miles.

Then the glider turn 180 degree and go downwind. (Airspeed 20 miles, groundspeed 40 miles.

Then the glider dives Down in the calm air with 40 miles groundspeed and hit the calm air. (The airspeed go from 20 to 40 miles)

Then making a 180 degree turn, and going up over the ridge with 40 knots airspeed and hitting the 20 knots Wind. (Airspeed go from 40 to 60 miles)

When turning at the top, the wing will Work as a sail and you gain more speed.


And so on.

Cheers
S
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Old Aug 03, 2013, 01:39 PM
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United States, OR, Corvallis
Joined Jan 2010
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OK, so now I REALLY "Get it"!!!

SpeedsterDen- That all makes perfect sense now, that's really interesting use of moving-air and nonmoving-air.

So far I've made 4 polyhedral rudder/elevator "woody" thermal type planes, but I've been thinking for a long time about thinner wings, more speed and ailerons with a 1 to 1.6 meter wingspan, now I've got even more reason to make one.

Your video of the "Wiesel" DS'ing the seaside walkway/wall is pretty cool, now "THAT" is good pilot skill!

Thanks again - Paul
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Old Aug 04, 2013, 01:20 AM
Will fly for food
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Bellevue WA,
Joined Dec 2003
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Paul the Cape Blanco Slope Fest is next week through the weekend. It's worth the drive and we will be DSing the bowl in the 150 to 180 mph range. There should be over 40 of us heading from all over the US. I'm packing up my stuff but I'm only taking 8 airframes this year. Here is a thread.

http://www.rcgroups.com/forums/showthread.php?t=1829396
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Old Sep 07, 2013, 11:52 AM
DS will change your life
SpeedsterDEN's Avatar
Danmark, Nordjylland, Sæby
Joined May 2010
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Dsing my Arthobby Thermic 2,5 and my Trinitus 3,2 F3b from the dunes today.
Perfekt light conditions for this ridge.
14 knots Wind

Trinitus F3b, advance flying. (1 min 16 sec)


2 min. session.

Thermic, Ds session (2 min 57 sec)


The speed for the Thermic 2,5 was measured with radar to 95 Km/h./ 60 mph
Not bad for a light thermal glider without ballast.

And same Wind condition tomorrow.


Cheers
S
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