OK - I'm certainly no hydrodynamicist. If I get a chance this year, I'll tow a sail-less cat behind a power boat and measure the squat of the hulls at various speeds. I've never heard of Dynamic Sinkage but would like to know more about it first hand.

Do you believe that a hull shape like a Nacra 6.0 is capable of planing?

We'll get the spinnaker and the GPS out this Wednesday for what is shaping up to be an extremely windy day in middle SC and see what we can sustain for giggles (although SC lake sailing is typically very gusty). That is...if my ears don't freeze and fall off first!