Ian -
I am no pro - by any stretch - but I would like to guess that you are at a normal stage of development for slalom.
What I write below is based on my experience, either past or present, and should be taken with a multi-grains of salt. I don't think I can emphasize enough the value of true coaching from a pro (i.e., someone other than me)
Everthing starts with the eyes (IMHO).
Based on the first two photos I would say you are either leaning back (over the back of the ski) in the preturn to start your turn (you may even be starting your turn with your head, kind of a nod-over-the-shoulder thing), OR your bindings are placed such that you are putting a lot of weight on the back of the ski, OR the ski may be just too big? In the top photo look how much ski is out of the water, your entire front foot - when in fact your entire front foot should be in the water.
Two footed turn - The easiest way to get the front foot in the water is to be in good position off the second wake.
Angle - The easiest way to get in good position off the second wake is to have good angle across the wakes. This allows you to cut through the wake with good leverage and minimal bounce.
Long Arms - The easiest way to have good angle is to have low hands going into the first wake. That means that you have 'long arms', elbows pretty much extended, elbows in close - touching your body, hands down by lower stomach, hips, or thighs (if you are a God). This requires some knee bend, varying by who you are. If you are not careful and forget to do this, you hold the pull across the wake with bent elbows. This takes much more strength and makes holding angle almost impossible because it reduces your leverage against the boat.
Balanced weight - To get the 'long arms' you need good balance over the ski coming out of the turn, i.e., not too far back. This is one place, where when you watch the pros, you may see a large variance. Some of these guys at really short rope will sort of 'wheelie' with front foot coming out of the water. But - if you watch them you will see even though the tip is up, they are not back over the ski, in fact they are probably over their front foot, and they get the ski back in the water into the 'long arm' position very quickly.
Let the ski turn - To get good balance over the ski coming out of the turn you need to let the ski do the turning. That is what it is designed to do. This is handled by 1. letting go in the preturn, 2. reaching-in low and skiing away from the handle (this is where the 'low-to-the-water' looks comes from naturally), 3. keep the free hand quiet and low, by your hip, high free arm has different effects on different people and you will see some pros do it, but from what I can tell keeping it low is prefered, 4. pulling - yes you pull as the ski comes around, but at the same time you sort of ski your hips up to your hands. The hard part of this is that if you turn your head early, you turn you shoulders which turns your hips, knees, ski..
Pre-turn - There are lots of different theories on this, the biggest difference is the West Coast vs. conventional turn. I am not that familiar with the WC style, but the goal in both case is pretty much the same. Set up the ski to do the work. You need to slow the ski down before the turn - that is what the wing is for and that is why you need balanced weight on the front foot, more ski in the water = more drag = slower ski = easier turn. This typically starts with the edge roll coming off the second wake or very soon after. And it is made much more difficult if you are bouncing off the wake because you have poor angle/body position. Where you direct your vision going into the turn is critical.
All in the eyes - Where you look effects your pre-turn. Your eyes control your head, your head controls your shoulders, your shoulders your hips, you hips your knees, your knees the ski. If you look down you will bend at the waist, if you do it enough you will face plant. If you look up-and over your inside shoulder you will probably go straight back over your ski. As soon as you start looking across course you will start turning in that direction or at least start getting narrow (losing outward momentum, getting closer to the wake). In worst case you will start to sink and then get popped as the slack tightens and make it impossible to get long arms. My experience is to look straight ahead, paralell to the boat in the pre-turn and keep looing in that general direction as the ski comes around in the turn. In other words your lower body is turning under your upper body (a lot like a downhill ski turn when you are going straight down the fall line). This sort of gives you a modified WC body position by default, but not as painful. It keeps your shoulders square to the boat (facing down course) even as the ski comes across under the rope. This makes getting a good reach, good pull, and long arms all possible because it gives you good leverage against the boat.
So it all starts with the eyes....
Well that certainly got longer than I had hoped. And it is just about everything I know about sthe slalom turn. So it either exposes me as completely clueless or confirms what I think I know.
Hope this helps.
Dave
If you believe something to be true, it will be - in it's consequences.
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