by dtc » Tue Oct 23, 2018 4:37 am
whether you can/should be able to duck dive a board is not a simple question, because its not only dependent on board volume but on board design and, of course, surfer skill
For example, i used to have a board with a really fat thick tail. I could get the nose down full arms length but for the life of me could never get the tail under water without virtually standing directly on top of it. Which meant most of my body was out of the water and .... thats not much use for a duck dive. But a similar volume board with a different volume distribution, probably could get the nose not quite as far down but the tail would be doable.
Ive read people saying you can duck dive if your board volume is half your weight in kg (or others saying its 60% volume to weight), but I dont know how deep that means and never tested it myself. That would put your board right on the limit just looking at volume and utilising a standard duck dive technique (as there are longboard techniques).
Anyway, as a starting point, if your board goes underwater while you are sitting on it, then you can get it underwater through duck diving it. That might not mean very far underwater, but you can keep experimenting until you know which waves/size/type of whitewater it works and where it doesnt work.
The trouble with learning to duck dive is that its easier on a small board, but most people arent surfing small boards when they start out and hence have to learn to duck dive using big boards which are harder to duck dive.
I agree with Big H, just practice and experiment, its not a futile exercise,, but it may not be a board that you can duck dive in all situations