On 20/09/2011 10:49 a.m., tsstproa wrote:

Yeah but in the second video it really shows how cleanly the hull is driven at speed. The hull doesn't shows signs trying hard until the depth of ama increases. The force from heeling moment is creating large displacment , bigger hole in the water more hull traveling though the water it creating to much drag. Look at the change in spary pattern on ama.

So what is the alternative?  Less volume and it will go deeper in the water until the beam hits the water causing more drag or it capsizes.  If the leeward hull submerges easily you won't be able to drive the boat as hard and it will be unforgiving and possibly dangerous.  As one hull goes further in the water, another one comes out so I don't believe there is necessarily more drag.  Nigel Irens has probably as much experience crunching numbers and creating record breaking multihulls as anyone.
I think these are beautiful hull forms and he has chosen higher volume and long lean hulls for a reason. 

Cheers, Paul

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