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Re: Speed Record for hydrofoiling ?
Posted: Fri Jun 07, 2019 9:10 am
by SparD
These are my personnal bests this year.
I'm just a weekend warrior participating in a few races each year, it lets you imagine the speeds of the top guys !
Re: Speed Record for hydrofoiling ?
Posted: Fri Jun 07, 2019 3:43 pm
by queneseb
So slow ! not even in the top 10 at defi kite @Spard
Re: Speed Record for hydrofoiling ?
Posted: Sat Jun 08, 2019 4:28 am
by gbrungra
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 (mast). Going from the tail of the board, forward to the leading edge of the front foil. It would not be light o stiff, but it would help prevent ventilation from traveling down the mast from the surface...
Re: Speed Record for hydrofoiling ?
Posted: Sat Jun 08, 2019 4:30 am
by SparD
queneseb wrote: ↑Fri Jun 07, 2019 3:43 pm
So slow ! not even in the top 10 at defi kite @Spard
Please post yours
Re: Speed Record for hydrofoiling ?
Posted: Sun Jun 30, 2019 2:09 am
by Whattheflock
I watch my GPS watch, hit 32kmh or 17knots today on my spaceskate wing in overpowered conditions. So quick. /s
Re: Speed Record for hydrofoiling ?
Posted: Sun Jun 30, 2019 7:09 am
by StillLovinIt
Another article about Sailrocket:
https://www.realisedesign.co.uk/product ... ed-record/
- Cavitating-Foil.jpg (61.21 KiB) Viewed 1336 times
Re: Speed Record for hydrofoiling ?
Posted: Sun Jun 30, 2019 7:51 am
by StillLovinIt
BTW, there's also some ongoing research on (super-)cavitating foil sections that have acceptable performance in non-cavitating mode (low speed mode) by adding a tail to the wedge. Looks like a tough read, I just looked at the pictures:
A New Family of Dual-Mode Super-Cavitating Hydrofoils
Re: Speed Record for hydrofoiling ?
Posted: Tue Jul 02, 2019 3:19 pm
by gbrungra
The fastest motorboats are non-hydrofoil. They skim the surface like a kiting speed board.
Even sail rocket was not fully foiling. 1-2 of its points of contact were skimming, with no foil at all. It only used a foil for lateral grip on the water, not lift. And its lateral grip foil was super-cavitating, meaning the water flow separated around it and did not close up behind it. Sounds very similar to a kiting speed board. A small inclined surface for lateral grip on the water, and the water flow is not closing up behind it.
I don’t think we should look to sail rocket as an indication that kite hydrofoils will ever hold the speed record. Sail rocket is very much like a speed board, but with an additional 2 (non-foiling) points of contact for stability. Like a speed board, but with training wheels.
Re: Speed Record for hydrofoiling ?
Posted: Wed Jul 03, 2019 10:44 am
by ronnie
gbrungra wrote: ↑Tue Jul 02, 2019 3:19 pm
The fastest motorboats are non-hydrofoil. They skim the surface like a kiting speed board.
Even sail rocket was not fully foiling. 1-2 of its points of contact were skimming, with no foil at all. It only used a foil for lateral grip on the water, not lift. And its lateral grip foil was super-cavitating, meaning the water flow separated around it and did not close up behind it. Sounds very similar to a kiting speed board. A small inclined surface for lateral grip on the water, and the water flow is not closing up behind it.
I don’t think we should look to sail rocket as an indication that kite hydrofoils will ever hold the speed record. Sail rocket is very much like a speed board, but with an additional 2 (non-foiling) points of contact for stability. Like a speed board, but with training wheels.
The advantage with Sailrocket was that the power was held mostly by the foil. That means you are not limited to the weight of the rider as to how much power you can use. With a pulling foil, the rider can be suspended on the lines from the foil to the kite, with the lines loaded with much more pull than his/her weight.