flyingcarpet said.. ....I
Why don't kiters use board leashes? ...
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Because it's dangerous. When you fall the kite doesn't stop immediately. The board can dig into the water and tension the leash. It's called tombstoning. The board then comes free of the water and twangs back at you like a missile.
flyingcarpet said.. ....I
....If you are way out there and get separated from your board, how do you get it back? ...
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The kite is powerful. You can body drag upwind or down wind. It's pretty easy to relaunch the kite and drag to the board.
flyingcarpet said.. ....I
... Isn't it risky?
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It's easy to stay relatively close in to shore. The performance of all forms of kiteboards, and foils in general is far superior to wingsurfing. You go faster. The angle to the wind is generally higher. You don't have to do great long reaches way out to sea to make ground upwind.
There is a risk with kite foiling that you drop your kite and cannot relaunch. Rule 1 is to grab your board immediately. It can run off downwind and stay out of reach as has happened to you. When you get good at foiling you're less likely to drop your kite, and you can ride a lot more conservatively.
There is also a risk that you can lose your board. I've lost one board, forever. I've lost two boards and got them back because I had my name and number on them. I consider that an acceptable number in 20 years of kiting.
More of an issue is that wingsurfing is sold as a safe option because you're sitting on a SUP and you don't have a big kite or kite lines. Think about how safe it is next time you're trying to paddle in from a couple of km out because the wind has dropped and/or switched.