Yeah I know I should maybe know this already, but as I’m mostly self-taught aside from garnering my knowledge from here I figured I’d ask since I don’t really know…
What exactly defines a board as a “hull” over a regular board. I’ve tried a little googling but mostly what I get is tomo’s “Modern Planing Hulls” which aren’t exactly what I’m talking about (at least I don’t think).
I did find this image of a Paul Gross displacement hull board (not sure how this is a displacement hull since it doesn’t really have gunnals or a pocket for air)
The main thing I notice about this board over a normal board is the hard-upturned rails and nose - is this what defines a “hull” style board?
Again, forgive me, I know it’s a stupid question but you gotta ask them at least once, right?
A hull I believe is a “displacement hull”, or a convex bottom…basically an upside down tear drop from nose to tail… but I geuss any bottom is a “planing hull.” Atleast that’s what a hardcore kid at a surf shop told me. I think a hull displaces water - according to what the man said. So it kinda sucks the board into the water more…anyone?
Look at mr Gross’s board, it has a subtle convex bottom…I would bet it has the roll more by rails fading to almost zero in tail…
I geuss when I asked the kid what a displacement hull was - I didnt know either. But I think it’s dumb - not knowing.
Yes, the bottom rail under nose is almost “dished”, but that I think fades gradually to zero out the tail…im not totally sure, but that’s what I was thinking.
a displacement hull is a convexed bottom which moves through water displacing upwards. Basically it was designed for boats with heavy loads to plane easier at slow speeds.
That is one nice board - Marc Andreini shaped ! Also, an excellent setup and shaping style. The vid I watched atleast three times. His description of his model, and his planing techniques are mind boggling ! I’ll take another look.ty for sharing.-Jim
