I think we talked about this one a while ago. Some kid on the Windsurfing Classifieds Facebook page was wanting to build one, too. I think it would definitely work with a kite but I don't think that mast is going to be anywhere stiff enough without some CF which is going to drive up the cost. Mast torque is definitely an issue with windfoils and why the alu masted ones are so heavy - needs a fair amount of meat in there. A kite goes upwind by healing over and riding the wing upwind while a windfoil tends to use the mast mostly. Also, on a windfoil, the wing is further from the mast, making the twisting moment larger.
Yeah - we have talked about it. It seems that the airfoil shaping has been done so the main job is covering with fiberglass and finishing. Still not a trivial task, but much more in the realm of possibility than would be the case if you had to carve the foil in. I'd like to make one too but don't have anything to ride with it (and no motor boat to pull me around, nor do I know how to wakesurf or kitesurf.)
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What happens in a black hole stays in a black hole.
Just intuitively, it would seem foils could have higher speed potential than conventional board because they have less area and could be designed to have very thin foils. Of course, guys setting speed records are on the far back of some pretty small boards. ???
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What happens in a black hole stays in a black hole.
I'll find it when I have time but (iirc) a fin company posted a page about drag. Foils have drag that increases with speed, planing objects have drag that's constant, not really a function of speed. That's why foils fly earlier and easier and hit the wall around 25-30ish knots depending on the design (where a windsurfer can't generate sufficient power to go faster). There will be refinements in foils, to be sure, which will push that higher but it's a fundamental issue of foils vs planing boards.
I know that lift and drag have a strong marriage. Intuitively, lifting my increasing girth must have a hefty price in drag. Add the increased wetted surface vs a wound up slalom or speed board and it makes sense FOLIs are slower. More sense than all those vectors, formulae and words that make my head hurt.
I think because NP/Adventure Sports distribute pretty much direct, iirc, from Brendan's presentation. But your general point is spot on. Easy way to compare something speedy like the Starboard to Slingshot and something in the middle like Fanatic.
I think we talked about this one a while ago. Some kid on the Windsurfing Classifieds Facebook page was wanting to build one, too. I think it would definitely work with a kite but I don't think that mast is going to be anywhere stiff enough without some CF which is going to drive up the cost. Mast torque is definitely an issue with windfoils and why the alu masted ones are so heavy - needs a fair amount of meat in there. A kite goes upwind by healing over and riding the wing upwind while a windfoil tends to use the mast mostly. Also, on a windfoil, the wing is further from the mast, making the twisting moment larger.
Another alternative for inexpensive foils: https://www.mantafoils.com/e-shop/Manta-mono-Windfoil-p99517536
I must say that after looking at Alibaba, a few of those look familiar.
I think a kite one would be fun to build, though.
Yeah - we have talked about it. It seems that the airfoil shaping has been done so the main job is covering with fiberglass and finishing. Still not a trivial task, but much more in the realm of possibility than would be the case if you had to carve the foil in. I'd like to make one too but don't have anything to ride with it (and no motor boat to pull me around, nor do I know how to wakesurf or kitesurf.)
What happens in a black hole stays in a black hole.
The Cobra Moray foil I just saw on youtube. I'm waiting for the carbon, hi performance version.
--- The Arrogant Jerk: Crabby and irritable since 1998.
Sebastian Kornum. Foils may be slower than full on slalom boards in a straight line* but this looks plenty fast for me.
*I've seen races where the foil is maybe fifth to the first jibe mark but flies through while the conventional boards fall off a plane.
Just intuitively, it would seem foils could have higher speed potential than conventional board because they have less area and could be designed to have very thin foils. Of course, guys setting speed records are on the far back of some pretty small boards. ???
What happens in a black hole stays in a black hole.
I'll find it when I have time but (iirc) a fin company posted a page about drag. Foils have drag that increases with speed, planing objects have drag that's constant, not really a function of speed. That's why foils fly earlier and easier and hit the wall around 25-30ish knots depending on the design (where a windsurfer can't generate sufficient power to go faster). There will be refinements in foils, to be sure, which will push that higher but it's a fundamental issue of foils vs planing boards.
Edit: here's the previous discussion: https://windsportatlanta.com/content/good-article-read-9717
I know that lift and drag have a strong marriage. Intuitively, lifting my increasing girth must have a hefty price in drag. Add the increased wetted surface vs a wound up slalom or speed board and it makes sense FOLIs are slower. More sense than all those vectors, formulae and words that make my head hurt.
I guess it is due to the old debil - induced drag - drag produced while creating lift.
What happens in a black hole stays in a black hole.
Pretty much covers it all.
http://joewindsurfer.blogspot.com/2016/05/sailboard-hydrofoiling.html
What happens in a black hole stays in a black hole.
Another interesting video. Wonder if that is a self build, or a new product.
What happens in a black hole stays in a black hole.
Modownhaul:
(Conspicuously absent- NP and F4)
I think because NP/Adventure Sports distribute pretty much direct, iirc, from Brendan's presentation. But your general point is spot on. Easy way to compare something speedy like the Starboard to Slingshot and something in the middle like Fanatic.
I'd like to go to North Beach and rent one to try the foiling thing out before I spend a bunch of money
Anybody up for a road trip in June?
Slingshot's hover glide fwind1 is def a frontrunner when it comes time to buy though.
Alan
Langdon always seems up for a trip somewhere and we had a good time in St. Pete. In the meantime:
We need you and Chris to go and teach us the finer points of windfoiling
Alan
I'm still working on the blunter points...
We need to know those too.
I called North Beach, they want $80/hr but it does include gear.
Alan
Did someone say roadtrip ?!?
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--- The Arrogant Jerk: Crabby and irritable since 1998.
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