Yes, but you can see from the GPS track exactly where I was kiting, which was kiting right in front of the sensor. This is similar to the comment above about current. Yes, in general, the current affects the wind on the river, but the current affects the wind very little to the immediate west of the sandbar (where I'm kiting on this map), because the sandbar blocks the main current flow and actually creates a small eddy effect here. At no point on this track was I farther than about 1/2 mile from the wind sensor itself, and never out in the main current flow to the north of the sandbar.cglazier wrote: ↑Fri Mar 13, 2020 5:07 pmInteresting topic tkaraszewski. But it looks like you are using data from the Weatherflow Event Site sensor. The actual wind on parts of the Columbia river varies greatly from this. There is often twice as much wind near the middle of the river as where you launched at the Event site.
200% agree and not comparable to handy anemo at 2m height, sometimes twice lower wind due to gradient...
Peter_Frank wrote: ↑Fri Mar 13, 2020 3:33 pmin my experience the last 41 years with sailing and flying.
so always observe and deduct, to understand.
other factors, even more important.
most classic is that there is wind a bit up 10 to 20 meters, and then you can have almost glassy water surface, so you can ride, but if you drop the kite, you can hardly drift ashore as no wind - happens quite often with this "close to zero" wind at the surface, but easy to ride when you keep the kite up.
Air temperature matters a bit
IMO by far the most important thing is "wind quality".
You can have gusty wind where easy to feel, and it can have a bit less power than average measured wind.
But you can also have "mini" imperfections, small bubbles in the wind you can not feel in any way, I call it "cheese wind".
These can make 4 to 5 m/s wind almost unrideable, eventhough it feels smooth and good.
The direct opposite is silky smooth perfect wind.
In this wind it can be possible to ride in 3 m/s wind only, with same gear where you could hardly ride in 4-5 m/s.
It just feels good riding in this
Double is easy, but as well no you do not need 3-4knots to move forward or even get out of the water.
No the measurements are fine. They are establish from water conditions and kite behavior and linked to accurate measurements.Trent hink wrote: ↑Fri Mar 13, 2020 5:04 amYou have bad measurements. The practical limit is more like 5-7 knots. Handheld annenometers give bad measurements.
I have seen guys kiting in something probably around 5-6 knots. They were on race gear, they were very skilled riders, and none of the ones I've talked to said they enjoyed it.
Some people like to brag about their light wind skills. Many more people just have bad measurements.
Never forget that the power available is proportional to the velocity squared.
Take a minute to think about what that means.
So I think it is quite possible to ride more that 12knots in 4knots wind. The kite can as well generate apparent wind in spite of any rider speed, it flies on strings. A hydrofoil or anything will start generating lift at any speed, so you can use the wing and board to make lift before you are fully or at all out of the water. Before a hydrofoil I used to ride boards like skimboards underwater like a hydrofoil. They would do this are very low speed like under 1knot could lift you out of the water. On some large hydrofoils you can ride comfortably from 4-5knots water speed or even a bit less.OzBungy wrote: ↑Fri Mar 13, 2020 7:17 amTo put low wind riding into context, when riding on my foil 8 knots on the GPS feels almost stationary. I need to be going 12 knots to feel that I am riding comfortably.
So that means in 4 knots you're going to be riding at 2-3 times wind speed. Before that happens you're going to have done some kind of water start with no additional apparent wind and relying on the drag from your board and foil for line tension.
Definitely. It is harder to adapt as the wind changes. Lighter wind can require a much finer touch and feel. Foil kites in particular can lose power in big changes because of their inertia and easy stall. One thing though light wind does tend to be smoother and have less gradient. Lower wind speed is lower entropy. Heat also increases entropy so colder air is lower entropy.Peter_Frank wrote: IMO by far the most important thing is "wind quality".
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