plummet wrote:I'm not sure how to explain it properly. But water is sticky. Use your surfboard analogy. Pick it up on the beach and you feel no resistance to pick it up apart from its weight. Pick the same board up in the water and you need to exert more force to pick it up. To break the surface tension of the water holding on to the board.
I'll try this out next time I'm out at the beach. How much extra force do you think it takes to lift a 5' x 21" board off the water? I can't see it as significant compared to the foil having to lift your body weight (minus some from the lift of the kite). I feel like any suction is going to be broken anyway with the board on an angle (both fore-aft and side-side) or by any chop. I'll give it a try though.
I'll try to look for it when foiling also, but I can't remember ever feeling like the board was sticking to the water and stopping me from lifting off.
Also, when you are planing, there is a high pressure on the bottom of the board lifting you up. That's why a small thin twintip can support you even though it has only a few pounds of buoyancy. Displacement hulls (like this) running at high speeds (for their length) tend to suck down into the water.
plummet wrote:So.... What he is saying is that is moth copy structure has a similar bouancy to a normal board but considerably less surface area than a standard board. So... When normal board with all that surface area hits the water it will be slowed down faster (needs to displace more water) than his design. Thus the sticky reference. It makes sense to me
I don't think buoyancy is going to be enough force to lift the nose back up when it comes crashing down. There just isn't much volume in the nose. It might not have much resistance when it first hits the water, but it's also not going to have any upward force to bring the nose back up. You really need the projected area up in the nose to lift it back up after it crashes down.
Also there is still a lot of wetted surface area, it's just that the area is on the sides instead of the bottom.