Still worry about wind too weak to get you planning ?
Not any more.
With hovercraft windsurfing board the slightest breeze will give you ride of your life.
I don't have access to materials to present you working model right now so I just explain whole concept. How it works.
Before first hovercraft can ride windsurfing board is filled with liquid nitrogen that activate low temperature superconducting magnets.
Such a magnet has this property that repeal everything including water so board will hang few centimetres above the surface.
To provide basic stability and resistance at least one fin is penetrating water surface.
Now you could jump on the board and enjoy a ride above the water in the slightest wind breeze.
It is not really sci-fi but to be fair I didn't saw even model - proof of concept yet.
Read this space on SB in few years time 
or prove now that is impossible 
Yeah that would be great if you love going sideways downwind at a rate of knots, or if you really love the sensation of spin out. Can't wait to see you give it a go 
Problem is when the magnets counterbalance your weight and then you come off the board suddenly shoots miles up due to there not being any weight
Kill switch or even a leggy might be helpful
Macro said...“windsurfing board is filled with liquid nitrogen that activate low temperature superconducting magnets. Such a magnet has this property that repel everything”.
“or prove now that is impossible".
Well, I've got a few minutes between jobs, so I'll bite:
If the magnets repel everything they also act upwards, so the owner is going to be “repelled” upwards too. Although the owner has his foot in the footstraps, the repulsive force will be so great that the footstrap screws will pull out of the board*. To overcome this, the footstrap plugs have to be deepened, the footstrap screws have to be lengthened, the weight of the board will increase, so the repelling magnets will have to be strengthened, which will mean longer footstrap plugs and screws........etc etc, etc. A vicious circle is being born.
*Mighty interesting even trying to put the footstrap screws in. How do you press downward on the screws when the magnets are repelling upwards? On the other hand, you wouldn't have to worry if you dropped the screws (although it would be mandatory to wear safety glasses when fitting the footstraps. On an OH&S level, the board manufacturer would have to include safety glasses with a new board: one windsurfer poked in the eye by “repelling” footstrap screws would cause the board manufacturer to be sued out of existence by the firm of Grabbit and Runn, Barristers and Solicitors).
Thus, the price of the board would increase, the inventor would turn to buying magnets in China, the Chinese have spotty QA so the repelling force of the magnets would vary, the board would take on a “lean” in one direction leading to increased air resistance (and the worst case scenario would be a board capable of only doing circles), etc, etc, etc.
Macro....give it up.
) it shoudn't be a problem at all to stand or even walk on such board
Could I put these superconducting magnets on my feet, splash a bit of liquid nitrogen on and walk across the water? That would spin people out.
I think walk on water boots would be a more popular application that levitating windsurf boards.
Then again a levitating waveboard would get some serious air time :)
Macro
You go first. One way or another you will be in the headlines.
If successful you will have followers, if not 
, then you won't know about it
Sounds like you can't lose!!
Macro,
when you talk about "low temperature superconducting magnets" you probably mean "high-temperature superconductor coiled to form an electromagnet", right? You may have to cool that with liquid helium. And lug along a portable nuclear plant to power it, unless you are tethered with a power cable. And the water would probably have to be injected with ferrous particles. But apart from such small details (sure you can solve them in a few months), the idea is of course workable Proof of concept - Back to the Future 2!
On a more practical note, I suspect that some aircraft technology will eventually filter through and modernize sailing. For example, there can be passive stall indicators on the sails allowing for optimum in-sheeting. The board can have active canards to adjust the attitude (roll, pitch, yaw) while sailing. The GPS unit can project the speed and bearing on the sail (like a HUD). The boards can have active rockerline (straightens and flexes as required). Lots of scope for improvement, IMO...
This concept (and it is good to think about these things as sometimes they pan out...) is starting to sound like someone building an elevator to the moon. Yes, in concept it may be feasible (you can google it) but: The Science Behind the Concept is a bit Sketchy.... The Engineering is about 40 years ahead of itself....
We already have the technology to do what we want it to....
The cost of doing this would be astonomical (no pun intended).... And finally, theres no way in hell that I would be the first one to try it!
So there you go... Challege Laid Down and I hope you prove us wrong!
and at least friction is eliminated
Macro,
don't despair about the minor issue of sinking when displacing water: the Soviet-designed "Schkval" underwater torpedo successfully overcomes water resistance and easily achieves speeds of over 500 km/h ( google VA-111 Schkval ). Perhaps you could adapt this technology for your hyper-board in sub-planing conditions? It looks very easy, much easier than superconductivity-based magnetism
what ever you blokes are on pass some this way!
or call Michael J Fox, he had the self levitating skateboard thing dialed in back to the future...along with the time machine and flying train!
I really wish to see how our windsurfing gear looks 100 years from now.
