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Ishie said..
I know there is a theory that having thin rails stabilises the board because they are under water a bit and so you have the resistance of the water to stop it rocking from side to side, but I dont know how real that is
Actually, with the board under water:
- you are less sensitive to chop
- but you are still sensitive to all deep water movements (backwash, small waves created by the breaking waves, rips, ...)
- the balance is more predictable: there is no "stable point", so you are more in control, and less the toy of chop... but you have to always actively maintain balance, so it is much more tiring.
- the board drag is increased, and also the row effect: when you pull on the paddle, the board will want to rotate instead of going forward.
- there is less cork effect: when you recover from sinking a rail, of when you stand back up on the board after a fall, you d not have a huge buoyancy force that catapults you to the other side
In summary, with a sinking board, you refuse the help of the board for your stability and take matters in your own hands: you thus have more control, but you must do all the work.