Select to expand quote
sotired said..
I tried this while stationary in the water, but when overtrimmed I was surprised that the kite still flew and still had some power.
This leads to the dynamic nature of the kite and the power it delivers. Here's a similar experiment:
When standing stationary in the water and the kite stationary above, try sheeting in fully. Although the kite provides additional power, it also goes further forward into the wind window. After a couple of seconds the kite is further forward, but now providing only about the same amount of power as initially experienced even while holding the bar all the way in. You can repeat this by letting the bar right out. Although there's virtually no power while the kite drifts back, once it has found a stable spot above you the power is generally the same as at the start.
What's happening is that pulling the bar in increases the angle of attack, which generates power, which is partially directed forward for the kite. As the kite goes forward, it rotates about the anchor point (you) which in turn reduces the angle of attack to the wind. Once the kite has rotated forward enough to reduce the angle of attack to the same it was before (relative to the wind) the power delivered can only maintain the kite in the air and no extra power is available to move it forward.
Now assume that, instead of standing still, you are moving acrosswind at a constant speed and the kite is 'parked' in the same position in the sky relative to you and is providing a nice constant power. The forward momentum of the kite's power is trying to get it out to the edge of the wind window as in the previous example, but your personal forward speed speed is making it lag back. A 'parked' kite means your forward speed and the kite's forward speed is the same, therefore the kite's power that you are currently holding is enough to generate that much additional forward momentum.
So the faster to go, the more power you HAVE to hold to maintain that speed.
Select to expand quote
I will try and note when I have this problem, but from memory its usually when I am flying along, pretty fast, and parallel to the beach. I think in this direction its a little downwind in one direction and a fraction upwind in the other. I know if I do wash off some speed and edge harder that I slow down, but I am going more upwind. I think at that point the kite moves into a different position and the bar does come closer.
... and here's where the dynamic nature of the kite's power delivery becomes your enemy.
If you believe that the the amount of power you are generating from the kite is too much, you want to naturally sheet out and dump the power, but if you stay at the same speed the kite will also lag back further in the window until it is delivering the same power as before, just with the bar further out. You have a couple of seconds to use the reduced power to change your speed down or change your direction to make sure the kite doesn't deliver that power again.
If you want to go fast, depower the kite so that the anticipated additional power can be held with the bar in a comfortable position so you still have the opportunity to sheet out and reduce your speed if it's getting out of control (I personally like 1/4 throw so there's still a little more power available if there's a lull, but lots of depower to dump gusts and get back in control).
If you don't want to go fast but ride acrosswind comfortably, either downsize the kite (reducing the overall power) or fly the kite higher (reducing the forward speed).
Hope this helps.