I had too look at the brand board before I wanted to add it.
The board is a HUGE and OLD Bora Duo with 3 mast positions.
In the past they even used it with 3x 3.5m2!

We tried it with 6,5m2 North in the front and 8,4 RS:4 at the back.
On the fastest track I almost stepped off the board, there are no footstraps... It's a bit scary.
Hopefully we can use the newer F2 tandem that we also have at the end of the summer, it will be fun to see how fast that will go.

Will add photo's as soon as we have time to shoot a couple of action shots.