wouter, why do you assume kevlar to be lighter than carbon?

besides, it does not offer significant improvement over glass (besides side impact), far less strong than carbon, fibres don't 'soak' epoxy (try sanding it...), no prepreg available etc...

haven't seen any turn to kevlar in (A-cat) mast design either... what would be reasonable if it would offer any advantages...

The Flyer '2' is build in carbon in Germany (maybe they again use the strange ~75% carbon/~25%kevlar mix (only useful after collision as the kevlar keeps the broken carbon in place) while the Geltek Flyer '2' is build in kevlar. I assume there are two major reason for the later being a kevlar boat again: 1. costs 2. more sideimpact resistant.