I recently purchased an NCX 5.5M, and there seems to be some confusion as to mast length ie between a 400 or a 430. I have a 430, so will it fit on this, and if so how much extension do I use??.
It says 400 on the sail, but someone told me this was a misprint

The 430 will be fine. Hopefully the curve is close to the one it was designed for, but that sail isn't super mast specific. It'd probably be a bit nicer on the 400, but if you already have a 430 I'd just run it on that for now.
Not sure about extension - which year is it? And anyway, once you rig it on a different mast the amount of downhaul required will change. Just downhaul it until the first 2 panels at the top of the sail get loose to about 50% of the distance to the mast.

Cheers Ben,
Its an 09 NCX, and the mast is a pryde X3.
It must be a good sail, took me a long time to find one!!

BEN.... I am waiting to order the new gator 5.5 and ncx 7.0 when they come out(via dave at wild winds wellington)...my question is; what would be the next best/most compatible mast/s for each (after the severene masts) to use...the severne masts are a touch out of my budget. I am using the latest 6.0 gator on an X3 mast at the moment but seeing how i am changing my whole quiver to severne sails I really would like to upgrade from the low end X3.Also will you be making the gator in a couple more standard sizes ;ie 4.0,4.5 & 5.0 ? I have the latest blade 5.0 but feel that a 4.7 gator is too close to that for my next size down...... cheers kevin