Author Topic: Getting ejected out the front door...  (Read 5301 times)

Solent Foiler

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Re: Getting ejected out the front door...
« Reply #45 on: November 11, 2021, 01:20:55 AM »
I'd rather have a rigid mast that works in most of the circumstances I use it for than a floppy one that eliminates a condition I rarely encounter. But that's me.

There would be a elegant symmetry if lighter riders needed a thinner mast to reduce ventilation and don't need the stiffness vs bigger riders who need the opposite! I guess Axis might be ahead of the game by offering 2 different thicknesses then!

I wonder if lighter riders cant their masts to windward more than bigger riders making their situation worse?
I'm 5'10", 65kg riding:
Gong Lethal 4'6 65L
Gong Catch 5'3 34L
Gong Hipe v2 4'11 70L
Axis ART 999
Gong Fluid L-S, XXL-S on 85cm mast
Duotone Slick 3m, 4m, 5m

Dwight (DW)

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Re: Getting ejected out the front door...
« Reply #46 on: November 11, 2021, 03:34:08 AM »


I’ll try and wing with more and less yaw. I’m mostly going upwind to the max so I can ride downwind.



Never yaw the board. Bank angle is the correct way to drive upwind.

JohnnyTsunami

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Re: Getting ejected out the front door...
« Reply #47 on: November 11, 2021, 03:12:21 PM »
I just had a session and was thinking about this. I find when I put my rear foot further back and more center where my rear strap would be (it’s usually a bit on the downwind side of the board and more forward) I lean over more and yaw less.

Makes me wonder if this is the reason kitefoil racers have a RIDICULOUSLY wide stance - to be in a better position for optimizing upwind and preventing mast ventilation? Makes sense that wingers would have this problem with our relatively slow speed we have our feet closer together and get away with it unless we’re hauling ass upwind.

Just a bunch of guesses…

PonoBill

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Re: Getting ejected out the front door...
« Reply #48 on: November 11, 2021, 06:32:03 PM »
Probably a pretty good guess. Adding yaw increases lift in the upwind direction by increasing the angle of attack (good!) but that lift is generated by differential pressure across the foil (bad!) which is something we can get away with when our wing is fully submerged, but turning a surface-piercing mast into a wing by increasing the angle of attack does the same thing as popping a wingtip out of the water.
Foote 10'4X34", SIC 17.5 V1 hollow and an EPS one in Hood River. Foote 9'0" x 31", L41 8'8", 18' Speedboard, etc. etc.

Solent Foiler

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Re: Getting ejected out the front door...
« Reply #49 on: Today at 11:43:55 AM »
Just to update the thread, I've finally had a couple of sessions on the modified Gong mast with the 999 and it's all good! The repeated ventilation has gone, which is a massive relief -  can get back to focusing on getting upwind as hard as possible.

What this whole experience ha done is made me more aware of the issue, and actually the Gong mast did ventilate a handful of times, but only when hit by a large white cap in big winds, right on the sweet spot which would be difficult for anything to handle, and if on flat water, it would begin to ventilate, but it just quickly sorted itself out without any action from me. I probably didn't notice it when I used that mast in the past...

The new setup is 500g lighter than the Axis mast, which is noticeable lighter, even just carrying my kit to the water. Stiffness wise it's difficult to judge because I'm now using the 375P tail rather than the 380, which way looser, and much more to my liking. I've even ordered the 350 now there's more to squeeze out of the 999 as a windy setup... Looking forward to giving that a go, but it's getting cold in the UK now, which always makes me feel like a kook again...
I'm 5'10", 65kg riding:
Gong Lethal 4'6 65L
Gong Catch 5'3 34L
Gong Hipe v2 4'11 70L
Axis ART 999
Gong Fluid L-S, XXL-S on 85cm mast
Duotone Slick 3m, 4m, 5m

 


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