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For
Starters |
February
2004 |
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Turns |
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| Weve
all demonstrated our ability to start and stop a turn or we wouldnt
have our category 8. Turning is easy, just adopt any asymmetric body position.
But whats the most efficient way to turn perfectly around our centrepoint? This is what we need to do when jumping with other people. Here, Steve Hamilton goes though the exact science. He should know 7,000 jumps, National Champion and Sebastian XL team member take it from the top... |
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| Much
has been written and talked about techniques of FS (Formation Skydiving).
As coaches, XL are constantly learning, revising and adapting our approaches
to the personal skills involved in our sport. This process has been greatly
helped by our extensive use of the wind tunnel. It has allowed us to observe
and experiment to a degree that was never possible in the past, to get
many repetitions of the same move and to see first hand what works and
what doesnt. The tunnel has enabled us to more clearly define the exact inputs needed to perform a certain manoeuvre in the most efficient way possible. This is not to say that the techniques here are the only way to do it, nor am I suggesting that we know better than other coaches who may have shown you different techniques... but the following is information that our team has learned and observed for itself during a considerable experience of coaching, watching and listening. When it comes to making turns in FS, Ive found it quite confusing to hear so many different ideas; just the amount of information can be a little overwhelming and it can leave skydivers with no clear idea of the best approach. |
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| Keep
It Simple Turning shouldnt be rocket science, so Ill try to keep it as simple as possible. First, lets take a model of something that we can aspire to be like, something that turns around a centre-point very efficiently. How about an aircraft propeller? I think wed all agree that a prop is pretty good at spinning around, essentially performing an in-place turn over and over again (I wish I could be that consistent!). The prop has to be well balanced with an equal amount of input from all its blades. If not, it will quickly wear out and cause some damage. For our purposes lets think about a two-bladed propeller. Imagine one blade is your upper body and the other your lower body. The fixed point where its attached to the engine is your bodys centre of mass, around your belly or your pelvis. See Figure 1. Now
all we need to do is to feather both blades of the prop evenly, displacing
equal amounts of air and hence pushing us around, creating a turn. Lets
break down the technique into our upper and lower body input, then combine
the two for the full move. |
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Figure
1 |
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Figure
2 |
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Keep your head neutral and relaxed, looking straight ahead. By far the most important thing here is keeping your spine straight throughout the turn. Imagine a T-shape being formed between your spine and shoulders. Any
twisting or turning of your back, or if one elbow gets closer to the
side of your body, will almost certainly compromise your turn and put
you off balance. |
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Figure
3 |
Figure
4 |
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| Head-switch This brings me onto another hot topic; whether to head-switch or not (head-switching is looking back at your target during the first half of the turn, then looking over the opposite shoulder to regain eye contact). There is no right or wrong answer. A head-switch is not an inherently good or bad thing to do provided we dont deviate from the T-shape. Where problems are caused by head-switching is at the point where you try so hard to see over your shoulder that the spine starts to twist and the blades of our prop become unbalanced. An argument Ive heard says that a head-switch is necessary to keep your eyes on your target (say, another skydiver opposite you in a formation). Well, thats great if your target is not moving! But what if that persons centrepoint is not staying still during your turn? Perhaps they are not turning in place, and now your visual reference is telling you that youre screwing up your turn... so then you try to adjust your input mid-turn, you lose confidence in your ability and, almost certainly, you wont turn in place either. The bottom line is, if whatever you are doing works well for you and youre happy that your turns are pretty good, then stick with it and keep refining what youve got. If, on the other hand, you feel that there could be a better way for you to do it, ask a coach for some help, and experiment. |
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| Lower
Body To displace the air with our lower body we need to lay our lower legs over to one side and allow one knee to push down slightly on the air whilst the other lifts up. See Figure 5. This
combination of the knee dropping and the drive you get from your booties
pushing on the air will create the propeller shape we need. We see a
lot of people using their knees very well but by just pushing them straight
down you lose the input available from your booties. You should notice
that by just thinking about laying your legs over, the knee will drop
automatically thanks to the bio-mechanics of the hip and knee joints.
Try to make sure the angle between your thighs and lower legs remains
the same, the action of laying them over from one side to the other
should resemble windscreen wipers. The centre of our prop remains fixed
so think of your hip bones staying level through the whole process and
not rolling to the side. |
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Figure
5 |
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| Its
pretty rare these days to see FS jumpers without booties on their suits
and thats because they work very efficiently by acting as paddles
to push the air around. If you use booties it makes sense that they work
well so try to get your suit fitted with some degree of tension between
your toes and knees. The exact size and tightness of them is somewhat
down to personal preference but if they are loose the wind just blows
them flat and they become expensive shoe covers! Putting
it all Together Its
All in the Mind |
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| Side-slide The inputs for a turn are the same as those used to produce sideways movement (side-slide). The only difference is that, instead of the inputs being from opposite sides of the body, they are now on the same side. So, to generate a slide, pitch the body towards that side, using the same upper and lower body movements as for a turn. See Figure 6. |
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Figure
6 |
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| Hot
Tips Practice on the ground to build muscle memory. Make sure its correct, get a coach to watch or practice in front of a mirror. Doing it eyes-closed can enhance the experience and build up your kinaesthetic awareness. Try turning in freefall eyes-closed to get the feel of an in-place turn. Feel your centrepoint before you start, to help you turn around it. Practice in a wind tunnel, if possible. |
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| Keep
your Sense of Humour Trying to improve your skydiving skills can be a confusing, frustrating process and its one weve all been through at some point. Try to learn the correct technique and get some coaching, stick with it and try to approach your learning with a good sense of humour. As kids we would consistently wobble and fall over when we were learning to walk but we didnt give ourselves a hard time about it. We had a beginners mind and were open to the whole learning process; we simply got back up, wobbled some more and maybe took a few more steps next time. Allow your improvements to come at their own pace, enjoy the journey and have fun! |
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