Tail shape
Bottom contours
fin placement
fin size and orietnation
Foot placement
rail shape

Go talk to a shaper

a lot of sex?

I'll go with Roder, rocker is the main ingredient, the more rocker the looser it will be, but unfortunately also slower. I have a theory, that for purely wave riding, this isn't quite true, because the wave face is also curved.

Plan shape is also a factor, parallel rails and wide tails will stiffen a board up. The angle the rail makes to the fin, when the board is leaned into the water helps to turn the board. So a fairly pinny tail expanding smoothly into a widdish middle should turn well.

Bottom shape, a rolled bottom is easier to lean over, but has reduced planing efficiency, so slower.

Fin length, the longer the fin, the more effort is needed to lean the board over.
Fin position, further forward looser, further back stiffer.
And of course multi fins, the more "toe out" on the outside fins and the further forward the centre fin the looser it will be

Radial inertia, or "swing weight" the further the centre of gravity is from the fin and the heavier it is, the harder it will be to turn.
So there are a lot of variables, people have been playing with them seriously since George Greenough came on the scene with his loose fast knee board in the mid 60s. (he could literally run rings round the top surfers of the day)
Getting a mal to replicate that was impossible, that's the main reason surfboards started to shrink, now the modern multifin board is very close to the mark, may be even better.
The trick is to achieve looseness without sacrificing too much speed.

Plan shape, radial inertia and fin length/position are about the only ones that don't affect speed, but fin position affects control, and reducing radial inertia without just making the board shorter isn't that easy, and plan shape is basically about how much area you need where, a narrow tail is fine on bigger more hollow waves, but can bog down in smaller mushy stuff.

Multi fins make things a bit more complicated, and they're a bit after my time, although I've ridden them since the late 80s I haven't done a lot of experimenting with fin position and angle on different width boards.

EDIT>
Just reread your question, getting the nose to swing around on a board that isn't moving?

It's the movement of water over the bottom of the board that gives it it's manoeuvrability, more drag one side makes it turn in that direction, plus the tilted board then offers a curved surface to the water, plus if one toed in fin comes out of the water leaving the other toed in fin in, you have a big turning moment.
Without relative water flow, all you can do is twist your body slowly one way and fast the other, putting more weight on the back foot for the fast side. If you really need to do this, radial inertia becomes the biggest factor, rail shape may help if you want to stop the board turning back in the slow direction, fat square rails a bit forward of the water line and fine tapered rails in the water line, when the weight is back. But I'm only guessing here, you'll need to experiment.

CMC said..

Every variable has a positive and negative. It's all a combination of outline, rocker, bottom contours, fin size, fin position etc etc. it's a tug of war between looseness and speed. You can have something that pivots on the spot with no drive, you can have a board that flies but won't turn.

It's kind of complex and in the end the right answer is having a medium amount of all so that the board is fast and loose.

Nothing makes something loose than going fast afterall.

But there again, you can go fast if you're manoeuvrable enough to get into the pocket quickly. Nothing else helps speed quite like a vertical drop.

I don't like sacrificing drive for looseness though. That's what I didn't like about twin fins, pushing out of a hard turn can give you acceleration.
Hit the lip, vertical drop, accelerating bottom turn back to the top.
A straight line speeder can't do that, nor can a wishy washy loose floppy thing.

when alot of blokes/ or laidies use it

WA71 said..

choco said..
a lot of sex?

Board not broard

Doncha meen board not broad

Northbridge 1am Saturday morning ?