Last time I watched a youtube video about russian catamaran from "shtilunet", the catamaran called "VITAMIN".
The framework of the Vitamin seems to be less strong in comparision with the ducky 17/19. I do not know of the dimensions of the aluminium stringer and beam. But I ask myself if it is necessary to use this kind of heavy framework.
I sail a hobie 14.
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Ducky17 and Ducky19 are much more than "Vitamin". It is not correct to compare these catamarans. Also, you can not shut off the possibilities of these boats. "Vitamin" is only a beach catamaran, it needs to be compared with Ducky14s Its weight is 65 kg!
Sailing inflatable catamarans Ducky