lift myth debunked

something is not right here..
vertical lift is created at expense of ..?
another force that could propel vehicle forward
so need to check if final is somehow beneficial at all
result will be again combination of everything again.

no it's not a free lunch but this is what michiel was referring to with regards context.

although the upward force is reducing the amount of sideways lift it is also allowing the board to plane earlier which then decreases hull drag so you go faster so the fin then creates more lift etc. it's a point of balancing the forces. you accelerate until the system reaches equalibrium. usually drag/aoa based. or you lose control and one force becomes dominant. staying in equalibrium is the most efficient

in the context of the system it is important to remember that the sail is not only applying a force sideways, it is applying a force forwards, downwards and backwards. the fin is also applying a force vertically, backwards, sideways and i gues forwards if you consider the nose of the board lifting. the board is applying a force upwards, forewards, sideways and backwards.

you can trim any of those forces purely by your stance. (except drag to a larger extent)

then there is buoyant force

That was done at the 1985 slalom worlds in Lake Garda by a Greek guy on the F2 team. I think he'd modified a Sunset.

The idea was old then - Craig Hughes did it with the 1977 Vee Jay dinghy champ Nu Hissy if I recall correctly (I was only a kid but I have the article somewhere).

It's one of the many things that people rediscover every few years.

ffs call simon anderson will ya?

now that is cool

it's basic shape looks very contemporary (ignoring the length).