The hulls aren't Nacra indeed. It is a custom 18 Square that did use some nacra components like the daggerboards I believe. Are component are however professionally build. The hulls are PESA, they used to commericially build A-cats in the 80's and early 90's I believe. The mast is most likely a Saarberg carbon mast with a landenberger sail if I remember correctly.

So indeed it is not a NACRA 18 sq. even though it is an official 18 sq. (it used to be a formula type of class) and may interest the initial poster just the same.

Wouter