Thanks for all the info Europ2.
You're all welcome. I am just a foil fan gathering and quoting information when need be.
I'm glad the French have continued to develop foils in a big way, as there are a lot of directions kiting could still go and its interesting to see what works or doesn't.
Lets give credit to a guy who has been providing numerous manufacturing tips and plans in a countless manner on the Kitefoil Forum: Franck Adam.
He has not only designed the 2 first foilboards of the podium but also 5 or 6 in the top ten. Prototype after prototype (roughly 10 per year), he has managed to divide by 2 the mast thickness within 2 years He has also considerably improved stiffness in flexion and torsion.
His motto is "Don't thank me but my wife for her patience coz so many hours spent in the workshop... "
I'm wondering about what might happen with the Olympics and if there is a possibility that a 50cm hydrofoil fin might be able to be used within the rules
I know the plan is for foil boards to have their own class with the IKA, and the Olympics are likely to have similar rules to begin with. .
Was wondering the same thing since the box rule was set up. I am not an expert but any board with any fin that fit into the 50cm deep box should be allowed to race. Should they have an horizondal appendix or not. A foilboarder should dare, one day .. I am not sure but is it written somewhere that hydrofoils with short masts (<50cm long) are forbidden to race with race boards ?
With the Olympics possibly taking place inside Guanabara Bay, so probably flat water and about 7 knots average wind (from measurements at the airport in the bay), it might open up the possibility of a new race board design that worked better in those conditions?
I know that Ketos by Orana have released their 50cm short mast in july 2011.
The advantages: faster for the expert and much more stable during the learning curve for the beginner. because any water touch is forgiven which is not the case when using a long mast (touch = fall)
Disavantages: must be used on a flat spot / closed sea in sub 15 knots conditions. You are so low on the water that when going upwind (45 degree tilting position) you are even lower and you touch the chop. all the time.
The hydrofoil is currently banked over, so how much of the T-bar is in the water doesn't affect control too much. Has anyone been able to use a foil with the T-bar vertical in the water? You would have the fairly constant lift from the foil and the sideways lift from the T-bar which would be changing all the time, but maybe in very flat water it could be controlled?
I assume that you think about riding flat to allow a 50cm hydrofoil to ride in choppy water conditions.
Moths or chris Miller foil windsurf ride fairly horizontally because their T-bar moves perpendicularly to the displacement direction. In my opinion, you would need 2 T bars + a surface sensing mechanism to ride the foilboard flat.