Frenchie,

What do you mean exactly by "around 90 lbs ( 12 % of the whole crowded boat )"

You mean the envisioned boat needs to weight 90/0,12 = 750 pounds ? Or do I misunderstand your comment.


>>About the beam aerodynamic drag, it's more doubtful ! Intensive wind tunnel tests for Ollier's big cats didn't show spectacular levels


But didn't the Ollier cats feature faired beams ?

>>the induced vortical drag from the rig is the main aerodynamic component


Of course but there is not much you can do about that when faced with a given amount of drag. The weight of an engine is significant in most cars but without it it wouldn't be a car. Only making the craft less draggy may result in less engine needs and then one can optimize the rigs accordingly.


>> hull drag with lateral huge separations came after, and beams followed...The water that hits regularily the connexions over the deck bridge is far more critical than aerodynamic fairing


Ahh, but I didn't write "aerodynamic drag" did I ? I refered to the total drag of the beams which, as you say, can be devided in two main components (other the weights and sorts) Aerodynamic drag and hydrodynamic drag.

You seem to have acces to test results that I haven't seen yet. Are these public domain or can I access them upon request somewhere ? I would very much appreciate that.


Sincerely Yours,

Wouter