Pacey said..
One of the things that determines the answer to your question is whether you can already wing foil well, or whether you are learning, because these result in two different answers to your question.
For my own experience at 95kg, I actually started with the One 6'5" x 29" 130 litre recessed deck board that Angie recommends in her reply, and found it very difficult as a first board, particularly in winter conditions, windy, gusty and choppy. The problem was not the volume, but the width and heavy bevels on the rails. The result was a board that was relatively unstable, making it difficult to even get to my feet when it was choppy. After 3 or 4 sessions making very little progress, I relented and bought a Smik 6'9" x 32" 143 litre, and the difference was immediate, stable but still quite short and light.
I'm now up and foiling fine and will probably go back to the smaller One board soon, and I'm sure it will be good. But my point is that the board you need to learn on without struggling and getting discouraged is different from the board you will be riding after 20 sessions.
Yeah always hard right at the start for most people as the board to learn on really is not the one you will be riding 10 or 20 sessions in so most people either put up with the learning side at the start or get a bigger board and then just down grade but this can be expensive(unless you live on the gold coast)
Also can depend alot on ones own previous experience as someone who rides shorter SUP's more than likely will pick it up quicker than say some one who just surfs as the SUP guy already has that paddle knowledge so only really has to adjust to paddling the shorter style foil boards. My guess is you will be feeling the extra width as going to 32 wide over 29 in foilboards is a huge difference as it is in any kind off SUP as well. We made a few 6'5 x 31 for some guys that are well over 110kg one guy was 130kg just for that reason and the boards have the same rails as the 29 wide and for them now its like standing on a dry land. Down side is all that width does push water and never feels as nice when up on the foil so always pro's and con's but extra width is better than extra length.
I must say though we have plenty of big over 100kg crew using the 6'5 and lots in the 90kg range using the 5'10 but as i said its more got to do with the experience of the rider coming into it these days and also how many boards they want to buy.
It sounds like RAL IIN is mostly going to use it for wind winging so going smaller should not be a issue as most crew start on there knees to build up speed and then jump to there feet allowing a smaller board to be used. If in the surf then most of the time the water should be glassy as foiling windy waves paddling in sucks and is hard on anything, well it is for me

If doing a paddle DW then it's only 3 to 8 good paddle stokes and then if all goes well that's all you need to do, haha sounds easy


We have big easy learning boards here on the gold coast that we just lend to people for the first few weeks and in 99% of cases after two weeks they bring it back and pick up the board that's perfect for them which saves the whole buying two board thing, more than happy to lend it to anyone if they pay the shipping both ways!!