DS basics?

[RMoore]

I've just discovered this discussion forum. Can someone point me to a description of the basics of DS? Thanks!

Randy

[Daemon]

Check out this link http://www.dynamic-soaring.co.uk/
and the other two threads in this forum.

That should give you some idea of how it works.

It's the only soaring activity where you might see someone crank a $1000+ glider up to 160+mph, have the skin delaminate in flight, the wing explode into a ball of confetti and the pilot walks away with a big smile on their face. It doesn't have to end that way.. perhaps a 600 foot vertical zoom instead. There's a number of ways to get into it without risking much. Namely the Bowman JW, and NCFM Bluto and Moth. If the hill is right, a combat wing with 6-8oz of lead strapped on top will do it too.

ian

[RMoore]

...for the reference. Very interesting!

[Ade]

Stay tuned into to liftzone.com My first artical is sitting on daves desk as we speak

Ade

[DSSlopeGuru]

Did you ever get the article.......would love to read it.

[Ade]

i only ever did 3. all in the archieves

http://www.rcgroups.com/links/index.php?cat=247&t=sub_pages

Ade

[robert zeeland]

hi guys!
what happened to the link in post #2?

Any other ideas and/or links on how to get started?

tnx, robNL :)

[Ade]

I let the domain name drop the site is hosted here,

www.rcgroups.com/~ade/DS/

[2lsvtec]

I don’t know where I got this pic but shows the basic idea and flight path. The yellow path is fastest. Purple is what we call upper cutting, it fun for just cursing.

nick

[Daemon]

I created that diagram to show the difference in the angles that you cross
the shear layer between doing a conventional horizontal pattern (red) and
a vertical looping pattern (pink). The key is to cross the shear
layer at as low an angle as possible so that there's the largest
increase in airspeed possible.

ian

[infopimp]

Here ya go - http://www.tuffplanes.com/Flying/Flying_Technics/Dynamic_Soaring.html

[robert zeeland]

The key is to cross the shear
layer at as low an angle as possible so that there's the largest
increase in airspeed possible

Hi, that's helpfull!

Are the red lines meant to be as isobars, so the closer they get to eachother, the more the pressure/windspeed is? Err, I'm a newbee here, but don't you think that the windspeed is at its max just on top of the ridge?(the higher<vertically speakin>the further the wind pressure normalizes, i.e. the isobars widen?)

Thanks again,
robNL :)

[raptor22]

I don't know if those are isobars...just think of them as arrows showing where air molecules are travelling.

See that at a portion of the are behind the hill, the wing reverses and travels up the hill? the area where the two parts of wing are travelling opposite of each other is the shear layer.

--Alex

[D.S.]

For a well written and illustrated description of slope Dynamic Soaring and how to fly the groove it's hard to beat Bill Patterson's site if you haven't already seen it.

http://www.billpattersonart.com/dszone.swf

Click on the first plane on the left at the bottom of the page. Click on the other planes to see the best Dynamic Soaring videos ever produced.

Dean

[robert zeeland]

Hi!
Big thanks for your input all!
Qstn> Both sides of the slope, should they have the same angle? Should the 'front' have the same height as the back?

Well, for some newbie DS-ing my eye got caught by several dikes here in the Lowlands. But the front is in some cases not even 'slopable'; would the back be DS-able then? (When the wind is on and square at the edge)

If no, is there a lack of sub-contractors in SoCal :p Time to relocate 4me

adios, robNL

[raptor22]

Yes, it is possible to ds with zero frontside, but I'm guessing it isn't as strong, and it should be hard to get height for a good dive.

--Alex

[Daemon]

An angle between front and back anywhere from about 40 to 90 degrees
is preferred. The best way to determine if your dike would work is
to simply walk down the backside and feel the wind. If it stops
or blows the opposite direction, then it's DSable. Next trick is simply
fly the plane into that area of stopped or reversed airflow and back.
To get height on the front to start your dive, you could also use a bungy.

ian

[robert zeeland]

http://xoomer.virgilio.it/ocapofe/Dynamic-eng.htm

check the onboard video of a DS'in airframe.

sweet! and thanks for all the info guys.
:) rZ happy hollydays!

[Z06kal]

ON that pic nick posted, the sheer layer isn't square with the hill like that all the time. It move around with conditions. In milder wind it tends to be more horizontol but when the wind really picks up the sheer starts to bend down and follow the slope of the hill. That means you have to stay low to the hill near the ground to be out of the turbulance. Lower = Faster