But their Daggerboards are NOT vertical and so they DO generate lift in that direction.
Hulls do not have VERTICAL sides and so they also create some lift (very small amount) in that direction also.
Very difficult rule to word correctly unless they specifically ban bendy boards.
Absolutely. And that brings us to the core of the hydrofoil issue:
Dynamic lift occurs to all boats in movement. If it wasn't for the existence of static lift (displacement), banning hydrofoils would make as much sense as banning aerofoils from planes.
I believe the only way to eliminate the dynamic lift components is to keep the boat still. This path leads us to reinventing the buoy.
Interestingly, the conceptual evolution of a displacement (hydrostatic) boat follows almost the same path as the lighter than air (aerostatic) craft:
- At rest they are pure displacement vessels.
- When they move, both inevitably generate some dynamic lift, so speed is improved with streamlined forms. (that explains why a buoy and a baloon are spherical and a boat and a zeppelin are streamlined)
- Then, it is natural that both start using the (inevitable) dynamic lift: they receive apendages for steering, stability and damping (rudders and (flippers or boards)).
- Eventually the dynamic lift starts to assist or replace part or all the flotation. The boat shape becomes apropriated to generate lift (plane) and/or receives hydrofoils, deflection strikes and the like, while the zeppelin becomes thinner and receives wings.
- In the end, the baloon becomes an airplane. Motor boats could just follow the same path, but sailboats have a power limitation (wind) that makes positive flotation indispensable.
Conclusion: is it possible to ban dynamic lift? Hardly. Would it make sense? Only if we want to sail streamlined buoys.
All the best,
