Rob S said...Kitepower Australia said...
The reason you are "depowering" your kite is so you can reach the bar comfortably.
So the correct term is trimming, you are using the trim system to trim the bar so that you can comfortably fly your kite without getting pulled in the "poo man" stance.
The "depower" strap or cleat does not actually depower you kite, this is a name give to the TRIM SYSTEM that perpetuates misunderstanding in our industry, and causes near misses and much trouble on our beaches.
Pulling in on the "depower" strap/cleat DOES NOT change the size of the kite that you have in the air, it just shortens the front flying lines, which effectively lengthens the rear flying lines and allows you to reach the control bar and still ride in a comfortable position.
You should always launch with the trim system set at the longest or if you suspect the wind is a bit on the upper limit for your kite, then set it at approx 1/3rd, then launch. You are still launching the same size kite, over trimming it is dangerous, because you will have lengthened the rear lines and this has the effect of reducing your ability to actually steer the kite, as well as making the kite more prone to "luffing or front stalling".
Become familiar with your kite, by using it, no amount of theory will replace using your kite in real wind and learning its wind range for you and your combined body weight and board size.
All modern kites can deliver less power by the rider pushing the bar out, or more when pulling the bar in. The trim or "depower" system on changes the range of trimming that you can achieve at the bar, but it does not and never will change the size of the kite.
I understand that the so called 'depower strap' is really for trimming. But isn't the aim of adjusting the trim strap to get the correct kite angle of attack for the current wind condintions. (ie. with bar fully extended/depowered, front lines should be tight and steering lines with just an inch or so of slack.) And then, if you find over a few sessions in varying wind speeds that your bar arm reach is uncomfortable you should shorten or lengthen the steering lines on the adjustment knots to get the bar at a comfortable riding position when the kite is correctly trimmed for the conditions?
The primary AOA or Angle of Incidence of the kite is set by the designer and the profile cut into the kite canopy.
All modern inflatable kites fly, as an intricate part of their design, on 4 equal length lines (regardless of how the brand/designer rigs those lines). Tensioned 5th lines are simply replacing leading edge supporting bridles, and have their advantages and disadvantages, but they are actually 4 line kites.
The trim system on all kites shortens the front lines, which effectively lengthens the rear lines. (which allows you to reach the bar in stronger winds, because you need to sheet out more.
Sheeting out or pushing the bar out, as the wind or your speed (and apparent wind) increases, does adjust the AOA of the kite, on a well designed, modern bridled and C kite. More so on a bridled kite, because the center of effort (COE) and the tow points are at the furthest point from each other and optimal for AOA adjustment.
However, by trimming ( or "depowering") or shortening the front lines, a rider just extends the upper limit of how much they can adjust the AOA of the kite when they push the bar out, understand?
There is a limit to how much each design and model of kite can adjust its AOA, due to drag and profile design, etc. Beyond that point the rear lines just become increasingly loose to the point where it becomes impossible to steer the kite, and all kites have this limit built in as part of their inherent design and limitations due to wind speed, profile, AOA, AOI COG and COE, lift and drag, its quite simple really haha!

Simple answer is fly your kite, get used to it, do not depower it much before launch, rehearse safety system release prior to launch, always get an assisted launch if possible. Tehtered launch if your kite is stable enough and you have stable winds, and self launch as a last resort and only if you have practiced it well in light winds.