It's rating at 59.3(provisional) and as we get data we will continue to update. The sails are 50sqm you can divide them up per the rules but the latest sails are following the development lines of the F18s since that is where the biggest changes have been in the last 10 years. I'm aware of 3 sailmakers building newer design sails. Schurr, Glaser and Performance.

The F20na fits in the class. Hopefully we'll get a chance to see how she performs.

There have been a few mods to existing N20s, different mast/booms/spin poles and most notably the sails.

So what I am reading and using the Inter/NACRA 20 as an example is that you can go from 45.15 meters square to 50 meters square of sail area; about a 10% increase, and still maintain the orginal N20 59.3 DP-N rating, albeit it being provisional?

Most of the specs I look at online show the N20 sail area to be 527sq ft or 48.9 sq meters.

What is an F20na?

F20na
Beam 8' 6"
carbon mast 31'
Hulls F20C

F20na pictures

Thanks for the correction have to stop referring to it as an Inter 20

Inter 20 Specs

Specifications
Length: 6.10 m 20 ft.
Beam: 2.59 m 8′ 6″
Weight: 177 kg 474 lbs.
Sail Area: 45.15 sq m 486 sq. ft

A F20c narrowed to 8'6"?

we used the F16 measurement convention.
The EP sails measured in at 49.06 sq. meters
the new Performance sails measured 46.489

The F20na also reduced the overall sail area compared to the F20c.

Did you get a confirmation from Skip Elliott the M-sq of his sails or this something you came up with?

If you don't mind me asking, if you're going to allow for a modified Inter/NACRA 20 to sail in the Open 20 class with a 59.3 DP-N, do you guys plan to run two classes; that is a Inter/NACRA 20 class for the stock boat and an Open 20 Class for the boats that are carrying the modifications?

For the Open 20 Class you may want to reconsider your "provisional" rating.. Seems a little unfair to those that don't want to have to spend beaucoup duckets to keep up with the Joneses

We measured the sails.
If there are enough stock I20s they can always have there own class.
The provisional rating is just that. We will continue to compile data.