The Hull Theory. Here I will competely rely on my audience's expertise, for I'm certainly shooting in the dark. So what is the hull theory? In principle, based on various different things I've heard, the hull, which is located on the bottom of the surfboard, is supposed to generate a water displacement that in turn gives a lift to the surfboard.
If that is it, then here is an illustration. As the boat glides through the water, the hull gives the vessell a lift, making it cruise slightly above the water level at which it sits when resting.

But so what? Assuming that's correct, how does that translate to water performance. Here is my shot in the dark. As the surfboard gains a lift, the friction drops, since there is less board surface touching the water, resulting in a faster ride. Is that the Hull Theory? If so, does it actually work?

Note: I'm showing this surfboard because (if my memory serves me right) it's supposed to heavily rely on the hull/displacement idea. But due to the poorly skilled photographer (don't let him know about it, please), you can't see the accentuated hull. It's a Gypys model by Micah Wood: 6' length x 24" x 2-5/8".
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