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by gbrungra
Sun Jun 09, 2019 8:32 am
Forum: Hydrofoil
Topic: Wing loading as a metric
Replies: 21
Views: 976

Re: Wing loading as a metric

It is a lot smaller, so not much influence. And the back wing reduces overall lift, as it pulls a bit down, negative lift usually. 8) Peter Sometimes it is not a lot smaller. When I use the speed wing in the front, the back wing looks about 2/3 the size of the front wing. And regarding the negative...
by gbrungra
Sun Jun 09, 2019 8:27 am
Forum: Hydrofoil
Topic: Narrowest upwind channel?
Replies: 3
Views: 305

Re: Narrowest upwind channel?

Duck-tacking vs no foot switch (heelside/toeside alternating)

Yes, probably easiest to train for the challenge in open water.

The real goal is to be able to maneuver in tight spaces as well as a sailboat, opening up new navigation options.
by gbrungra
Sat Jun 08, 2019 6:45 am
Forum: Hydrofoil
Topic: Narrowest upwind channel?
Replies: 3
Views: 305

Narrowest upwind channel?

Challenge: what is the narrowest channel in which a kiteboarder could still up upwind?
(wind direction is directly down the channel)

Let's say zero tide/current

What is the optimal gear?

What is the optimal windspeed?
by gbrungra
Sat Jun 08, 2019 5:58 am
Forum: Hydrofoil
Topic: SUPfoil touring
Replies: 4
Views: 307

Re: SUPfoil touring

So let's call Hawaiian style an "open ocean downwinder" and come up with a different name for my idea. "Coastal downwinder"? "Down sweller"? (Because there doesn't need to be wind, just waves?) 2. Is is possible to do a coastal downwinder while staying (mostly) up on foil? 3. Is is possible to do a ...
by gbrungra
Sat Jun 08, 2019 5:50 am
Forum: Hydrofoil
Topic: Wing loading as a metric
Replies: 21
Views: 976

Re: Wing loading as a metric

Right, rear stabilizer is negative lift (pushes down).
Front stabilizer is positive lift (pushes up).
by gbrungra
Sat Jun 08, 2019 4:33 am
Forum: Hydrofoil
Topic: SUPfoil touring
Replies: 4
Views: 307

SUPfoil touring

I know the Hawaii guys do big offshore downwinders, but how about the mainlanders? On a SUPfoil, without a kite, could you foil down the line resting, then pump out to the nest wave, and cover distance down the coast with any kind of reasonable effort? Maybe only with swell coming in at an angle to ...
by gbrungra
Sat Jun 08, 2019 4:28 am
Forum: Hydrofoil
Topic: Speed Record for hydrofoiling ?
Replies: 23
Views: 1584

Re: Speed Record for hydrofoiling ?

We should not expect the highest speed to come from a course race. Would be from a dedicated setup. Smaller foil. One which is barely able to get up on foil, and only starts to be comfortable at 30+ knots. And is designed specifically to limit ventilation and cavitation. I’m thinking a canted strut ...
by gbrungra
Thu Jun 06, 2019 5:53 am
Forum: Hydrofoil
Topic: Speed Record for hydrofoiling ?
Replies: 23
Views: 1584

Re: Speed Record for hydrofoiling ?

Kite hydrofoils already rule in efficiency-limited situations. Speed boards still win in control-limited situations (very high winds). And Sail-Rocket got to the next level w J-Shaped super-cavitating foils.

I’m interested in this topic for bragging rights for our sport, not participation...
by gbrungra
Thu Jun 06, 2019 5:42 am
Forum: Hydrofoil
Topic: Wing loading as a metric
Replies: 21
Views: 976

Re: Wing loading as a metric

Great topic. Foil surfing is a more pure hydrofoil wing-loading situation. As soon as you add a kite, the kite also has a wing-loading, but it is probably some factor of rider weight/(kite-size*sqrt(windspeed)). Also, canard (spitfire) front stabilizers lift, so not a direct comparison of main wing ...
by gbrungra
Thu May 30, 2019 7:56 am
Forum: Hydrofoil
Topic: Kites available in sizes smaller than 4m?
Replies: 48
Views: 1877

Re: Kites available in sizes smaller than 4m?

This thread is blowing my mind.

I learned on a 17m. After 5 years, and learning to foil, I’ve still never kited with anything smaller than a 12m.

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