Hey guys
On the sail it says for mast
430/25/21
460/25/25

luff 4.49
Not sure with mast how that works
cheers for any help

It's been a while since I dealt with mast specs bit it would be 430 mast and the the 25/ 21 would be IMCS and MCS which were two different ways of measuring mast stiffness. I can't remember which is which.

The MCS /IMCS ratings are measurements of the stiffness of the ideal mast for that sail. There are two different ways to rate mast stiffness. The sail designer is saying that either mast will be suitable.

The "luff 4.49" tells you that if you rig with a 430 mast, you'll need an extra 19 cms of extension, with the adjustable top of the sail set to minimum. The adjustable top is often called a "turban top".

If you rig with a 460 mast, you'll need to extend the "turban" top of the sail by 11 cms, with zero extension (because the 460 mast by itself is already longer than 449).

Hope that's clear.

If its a Neil Pryde mast all you do is grab a hacksaw and cut 11cm off the bottom of the 460 mast. Im joking bigtom

It has been quite some time since sails and masts showed both the (old) MCS number an the IMCS number
A sail showing 430/25/21 would be quite old and definitely designed for SDM so recommending an $800 gee whizz wave RDM is a bit over the top. It may not even be usable on a new RDM.
Very likely this sail will work with an old 430 / 21 SDM - which would also be cheap.

Bigtom, what sail is it?

bigtom said..
its an ezzy wave 5.8 and a 5.2

Ha having a laugh at Magic Ride's prescience

SDM (standard diameter mast) will work but Ezzy Wave sails are better suited to an RDM (reduced diameter mast) Any constant curve mast (SDM or RDM) should work well.

Lucky guess eh!! Here are the numbers on their newer sails, although this Ezzy sail looks to be a couple years old.

While not recommended by Mr Ezzy, you can buy a 460 and the top half of a 400, that gives you a 430 and 460 and if you later need a 400 you just need the bottom half. Its nice you can buy just the halves as if your a gumby like me and manage to break one (not easy to do) you dont have to replace the whole thing.