They have, but at the start of the class we (as the F16 class) made an agreement with AHPC that other builders could use the superwing mast for their own F16 products. Given a few guidelines and provisions but no limitations !

I still have that in writing in my archive.

This is one of the best deals we have made in the F16 class. In turn, it is also very advantageous to AHPC. Basically, the superwing mast is now the standard mast for all F16's using alu there, thus making all boats highly similar in that important area. It also means that Goodall can supply quality sails for all alu masted F16's (the vast majority) while using the experience gained with the Vipers.

A win-win situation if there ever was one.

Wouter