I can't speak for AHPC, but Greg told me that he would build the Viper main different to the Taipan because.

The spreaders are different, the mast is longer,the boom is shorter, also the loads are higher because of extra width and weight.

The spreader difference and weight apply to the Blade Vs Viper also. Although I would expect the Blade and Viper main to be closer in design than the Taipan.

In reality though, you will easily get more variation from different manafacturers making sails for the same boat from my experience. <img src="http://www.catsailor.com/forums/images/graemlins/tongue.gif" alt="" /> I don't think sailmaking is the exact science we all wish it was. <img src="http://www.catsailor.com/forums/images/graemlins/wink.gif" alt="" />