I designed it and built it with my friend Mike. We called it Windwheeler.

I have no idea what FISLY Class is, but it was never raced to my Knowledge.
We made maybe 25-30 complete as pictured over a couple of years in the mid 1980's. We also sold more as DIY kits: Wheels, Axels and trucks - make your own board.
I still have the casting pattern plates for the trucks, so in theory I could still make them. Can't see any demand though. I stopped production when our market was flooded with cheap, wobbly, low quality boards from China.
We were inspired by the French 'Speed Sail' which was very popular in Europe but outrageously expensive in Australia. The French design also had a turning circle that was far too large for our beaches. So we designed our own trucks with a nice tuning circle, but to retain good stability at speed.
They had cast aluminium lower trucks on a Nylon base plate like a skateboard. Aluminium axels were bolted to the truck and the wheels were golf buggy plastic wheels with sealed ball bearings.
We used them on the tidal hard sand flats at Sandy Point, but more often on the wide flat hard sand beach at the adjacent Waratah Bay. On hard sand, 5-8 knots of steady onshore breeze was plenty to get up to speeds faster than I could run (as a much younger man

). We had no GPS in those days, but I think we were able to go around 2-3 times wind speed with an old triangular, 4m wave sail in 5-10 knots of wind. More than about 15 knots of wind and it got very scary fast!

. We could tune the trucks for stability, but crashes really were dangerous. There was always an element of sideways skidding/crabbing when at max power and we stood with our feet very close to the mast foot.
We tried them a few times on asphalt airports aprons and runways, and large sealed car parks but they were far too fast to be safe, and very sensitive to slope.
It worked well on a short grass lawns or smooth paddock, but the slightest interruption to steady wind made it hard. Finding such a place that was level with steady consistent wind (no trees upwind) was near impossible.
In lighter winds, on the hard sand beach, it was a joy to gybe. Many of us learned to duck gybe on this thing and then transferred it to the water.

With practice, we could do big 4 wheel drifting gybes and even 360's
They didnt work on softer sand.
I believe a few may have made there way onto large salt lakes / clay pans in other parts of the country, but have no direct knowledge of this.
I actually made a set of skis and tried it on the snow plains at Perisher. Total failure! The wind was just not steady enough and it would not go up even a slight slope.
I have often thought it would have worked well on skates on a frozen lake, but we just dont have anything like that in this country.

I will have a search, but I don't think I have any photos of it in action, and certainly no videos. This was in the days before digital photography and video cameras.
The Blokarts are quite popular here and that looks a lot safer and more interesting to me.