I will PAY You through pay-pal or other , for your time to do this experiment for me. Hows $20 an hour sound, with a $100 minimum ?
Take a Flat L shaped aluminum bracket, the with of your foot, that's the length of your foot on one side , and a bit more length for the shin-bone side where your calf-mussel is located THEN step on it, and take some duck-tape and strap your feet Solid , so there's NO movement in your ankles.
Now go try to use your Hydrofoil. The only other perimeter that's left, is the slop in the inter-face between what's left of my real leg and where the prosthetic contacts it, (it wobbles a bit). Actually, a LOT.
The Only movement that is Absolutely Solid, is where i point my Knee with my hip, my foot follows with More precision than my real leg had because of the SS bearings on my steal knee-brace.
I recommend that Ya try your Strapped surfboard First ...
First thing you'll notice with the surfboard or TT, is when you lean back, the board follows the Exact angle , so there's no need to off-set the straps on the board any more for extra leverage.
Your feet will need to go Pigeon-towed instead of Duck stance because the moment you bend your Back knee, the feet are no longer Flat. Try that first, before Ya go in the water by bracing on hand on your car, and lean back with both knees straight in a DUCK stance, (feet pointed outward) ; then bend a knee & see what happens . The rear foot will dig the outside rail in the water, and over Ya go!!
Also, say i'm gonna do a back-roll ; because of the slop in the interface with the prosthetic, there is NO guarantee that the amount of energy i put into the roll with my board, will be the same every time. I need to adjust the landing by sheeting in/out with my bar ; so i generally add a meter extra altitude in the jump to accommodate the unknown force that's initially added to the roll .
Be SURE to use a kite with Smooth sheeting ; it will be the main source for your balance because you no longer can adjust your board angle with your ankles !! You won't believe how much you use to count on the adjustment of your rail on the board. That's the main reason i use the Ozone Edge ; easy - smooth sheeting, and the kite stays where i put it.
Ps : Stay the Hell away from the shore-line ; with no anckles, you can NOT count on your knowledge of kit boarding any longer, and i'd Quite kiting if you get Hurt doing this experiment for me !!!
One other thing : swimming is gonna be a Bitch with your ankles locked so i'd use a water-ski life jacket or similar , as well as a helmet please !!
And Thanks a LOT !!!!!!!
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A bit of good news might be that Laird Hamilton and Co. have been using snowboard bindings. Fair enough, they are still using their ankles, but at least their feet are more locked in.
That might be a way for Gunnar to go. Fit the snowboard or ski boots and gradually lock the ankles up more and more.
The other thing is that the pulling foil is likely to be the ultimate foil - although it may only be used in powered conditions, so some sort of foiling is going to work for you Bille - might just take a few years.