It all started with the australian inter 17 which had a little bit different hullshape too if I remember it correctly. this boat never made it out of australia. It was designed by nacra Australia.

Then we had the introduction of the standard inter 17 with a alu mast ans 13,68 sq. mtr. of mainsail , no spi. exclusive signlehander.

Than in the USA we saw the birth of the US inter 17 R, carbon mast, much more sailarea and a spi.

After that I saw the setups of inter 17 R as well as that of the inter 17 XL pop up in the Texel rating listings. The inter 17 XL looks to be the same as a standard inter 17 but with a larger mainsail. It is still listed as a singlehander.

Now we have the inter F17 xl. ; which I assume from the name has the same mainsail area as the singlehander 17XL which is 15,25 by 8,05 in addition to a jib and a extra trapeze.

Personally I expect it too be the same platform as the standard inter 17 but with a jib, extra trapeze and a spi.

I haven't heard before of a Formula 17 before this post.

That is all I know.

Wouter