when is lift not lift.

Ok . dumb question to start things off here.
The other day we were talking about dynamic soaring. something I feel I am when I get on the slope DYNAMIC:lol:
Anyway I accidentally said that the glider was passing through the lift on the back of the slope and into neutral air so every time it went into the lift zone it would pick up speed . OK so I was shot down by a comment that there is no lift on the back of the slope. :whistle:
If so then why doesnt that glider get forced to earth when in the positive wind zone.
So theres the question , simple and complicated answers accepted ,
lets here them
Cheers dumb gee.:silly:

The way I think of it is that every time the model comes around into the lift it gets another kick upwards.

It can then turn this into speed by diving.

I mentioned this once in the other forum and likened it to being on a swing .....each kick at the right time sends you higher.........I think it was Andy Ellison who said that's a good way to describe it ......He should know. :huh:

Polyphilla.

I've not tried DS myself, but I know that the shape of the hill is critical. I think repeat think you need a razor-top hill with a steep drop on either side, or all you get is flat wind, and the sink at the back that drags the model down. You need a sharp edge with a good rotor, so that the wind away from the back of the hill is going down, but the wind close to the ground is coming up - in the opposite direction, and the DS bit is ducking back and to between the two. So you dive the model down away from the hill, and zoom up close in, and try to miss the outcrop of rock that just jumped up in front of the plane!

If anyone wants to read up further on this then here's a Wiki link..... Dynamic soaring
I think it explains it very well.

Polyphilla.