What foils are 'interchangable' ?

Putting it here as windsurfers perspective is more relevant to me maybe - so q'n for those who do more than one discipline:

What sports use the same foil size (roughly) for the same rider?
eg: would I use with acceptable results the same foil for windsurfing, a wingding and a kiteboard (all travel at same speed) but not a prone surfboard (needs more lift?) and not a SUP (slower needs more lift?). That's my assumption anyway.

Note I said acceptable results, not necessarily perfect or for the hardcore user - doable. Usable. Worth it.

I assumed if anything was the same its masts.... confused now
But more wondering if I get a WS one will I use it for wingding or SUP also? Intent to make extra wings for same mast and fuse eventually.

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Mark _australia said..
Putting it here as windsurfers perspective is more relevant to me maybe - so q'n for those who do more than one discipline:

What sports use the same foil size (roughly) for the same rider?
eg: would I use with acceptable results the same foil for windsurfing, a wingding and a kiteboard (all travel at same speed) but not a prone surfboard (needs more lift?) and not a SUP (slower needs more lift?). That's my assumption anyway.

Note I said acceptable results, not necessarily perfect or for the hardcore user - doable. Usable. Worth it.

Short version: Windfoil and wingfoil, yes. Maybe some prone surfing. Windfoil and kite if you use a bigger sail but will exclude the others. You'll want/need a separate fuse for windfoiling, though (exception below).

I'm a windfoiler (wingding gear acquired but waiting for warmer water) but at our launch, I spend a lot of time with both kiters and 'dingers and we all get along well. I've talked at length with them about this so I hope this is helpful. Sorry to be long winded but I hope the details help explain the reasoning.

Depending on your weight and likely wind conditions, you could certainly overlap 1700-2000 cm2 (or even 2400) wings for both winging and windfoiling. If you go small sail windfoiling (small sail/big foil wing) it's the easiest. I think the Starboard Supercruiser, NP Glide series, Slingshot i84/99s, SAB (formerly Moses) and some permutations of Axis would fit the bill. These ecosystems are among the more flexible. You likely will need to have dedicated fuses for each endeavor however. Both that a windfoil places the wing further forward from the mast and the shorter mast preferred by other foiling sports feels overly sensitive on a windfoil. The one exception is the Slingshot Switch fuse which flips end depending upon the sport. However to gain that flexibility you give up robustness - ie they've been know to fail at that connection. There are threads galore down the hall on the topic.

With kites, the upward pull of the kite significantly reduces the amount of lift required of the hydrofoil so a big wing for kites, afaik, 1000-ishcm2. The biggest on the SAB/Moses site, for example, is 1250cm2. You could overlap kite and windfoil foil wings by going more big windsurf sail/smaller wing (that's the genesis really of Slingshot and a number of European brands) but wingdings outside the experts will want much bigger foil wings.

Good masts generally will cross disciplines - certainly the Moses, Starboard, NP, do. Axis have two different chord widths (17 & 19cm) and recommend the wider for windfoils to reduce twist. Certainly there is side loading on a windfoil mast but since our fuses tend to be longer, they are subject more to torsional stresses (you don't want them wagging like a dog's tail) and a more rigid system feels more locked in.

One aspect about masts, though, is that a lot of winddingers start off at 75cm in length which is, imho, the bare, bare minimum for a windfoil. A short mast on the first day feels reassuring but you quickly find that it gives you much less margin for error in overfoiling, especially if you are in chop. 85-90cm is better for windfoiling and better wingers will got that long, too. If you are just doing it for the occasional kicks, you certainly could do 75 but you'll eventually want something longer for windfoiling (about the 15th time you foil out, it'll cross your mind)

My impression is that prone boards tend to want smaller wings than wingdings because of the need not to have excessive lift as you accelerate down the wave. I'm not sure what size waves you have in mind, though.

slingshot infinity system the go
switch fuse makes it a pretty versatile setup.

At 75kg, I almost never use the 1220.
Even in 8-12 knots, I use the 600 sq cm kitewing, it's plenty.
Not everyone is 100 kgs in muscle.