@BraceMaker - I remember when MC came out with the first Illmore engines with massive boat covers and super tall pylons...It definitely felt a little harder to stay down in a pull against a higher connection point!
@dchristman The ski under us when on the water is producing massive drag and lift forces. Couple that with your body leaned at 45deg with centrifugal force (pull) from the boat and you can use some trig to roughly resolve the direct compressive forces would be acting in the bodys CL axis between the shoulders and the feet.
When we are discussing a "static land jig" to mimic a slalom pull under load, the higher the connection point is, the LESS compressive forces you will feel acting vertically through your body. Conversely the lower the connection point, the greater those compressive forces will become. To me, 90% of the reason for doing a lean drill is to help figure out how to stand in such a way as to resist getting 'crushed' while in the pull. If there are inadequate compressive forces, the drill is practically useless.
Now if you want a static land drill setup to mimic more closely to what's going on while skiing (still a far stretch from reality), then my recommendation is to use a lower anchor point, and stand with your body in the right position such that you are working against more then just gravity to be able to stand up tall and get into a solid position.
I suppose another option is to use a pylon height type of connection point, but put a 450lbs into a sack and put it onto your shoulders while doing said lean drill.
The biggest single gain I made in this sport was after I became aware of what part of the system is really responsible for putting that crushing load against our body during the lean, and it is not just the boat.
Below are REAL figures of line tension skiers at shortline deal with as the line comes tight. Not saying this is ideal...but its just something to provide perspective. If you consider every action has an equal and opposite reaction, you can do some very general and simple math to get a ball park on the compressive forces acting vertically through the body.
A lean drill should teach you more then how to hold onto a rope tied to a wall. It should teach you how to manage compressive forces your body is dealing during the pull, while simultaneously controlling your body position with respect to the ski and with respect to the anchor point.
If you have good body position, you can handle massive loads and barely feel them. Conversely, if your body position is poor, it takes very little load to further compromise your position. This goes back to the perceived versus actual loads conversation from a few years ago.
Still think some bungee is going to get the job done?