As far as I know, the Carbon masts were only to be SMOD for with first two years after introduction in '04. This to allow Marstrom to recoup design costs. But, there was to be a royalty paid to Marstrom for any other builder and Marstrom design/layup & bend characteristics were to be adhered to. This was the original carbon mast arrangement...not sure it was implemented as planned. The concept was to lock down performance advantages from different alloy extrusion runs to avoid teams having to test a few dozen sticks before settling on a couple of favourites. However, even the carbons are showing variations, so I'm not sure we've improved the situation much.

Hulls are allowed to vary in measurement from a the class approved templates. Modern Marstroms are noticably different in hull shape than builds from the 70's and 80's. The Marstrom is fuller in the rocker area forward of the main beam; finer bow entry; more rounded gunwales; much rounder in the sterns; etc.


Sails are allowed to vary according the class measurements.