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LeeD said..
Why run the mast base so far back?
Also, modern slalom boards have mast bases well forwards from wave, freestyle, and even freeride boards.
What are we doing out there? Are you doing forwards and airtime spin tricks? If yes, mast base back for sure.
If the goal is simply go semi fast, be stable and comfy, make planing jibes and sharp jibes, jump and heli, old school mast position works just fine.
That's an interesting question.
The change of stance has come with our better understanding of how shortboards work.
The early shortboards tended to have the mast foot set well forwards and some even had a sliding track - and that was based on the false idea (inherited from longboards) that you needed to put the mast foot forwards to go upwind.
A later myth that some still believe is that the mastfoot goes forward to 'hold down the nose' .
What is a 'better' view is that the rig area is set over the buoyancy of any board and the sideways load of the rig is counteracted by the rail in the water and the fin area and fin 'lift'.
Any board planes fastest off its tail and so it makes sense to get rid of all that unnecessary board length up front. It also makes sense to stick the width and buoyancy under the weight of the sailor - and this is why our boards are now shorter and wider. (Although we still understand that boards can be TOO wide or too short in some conditions).
Once you have shifted the buoyancy back in the board the rig comes back too, but we don't want the old school mast rake because that would put the boom end and mast tip well behind the board.
Excessive mast rake also traps you under the rig, in that you have to move a lot further from blasting position when you want to make a turn. The upright stance allows faster changes in turns and other manoeuvres, and can be just as fast in a straight line. For wave sailing and freestyle you want the front foot strap surprisingly close to the mast if you want to get over the rig fast in a cranked bottom turn. The shorter hull lengths also turn in a much tighter arc.
Nowadays we also think about rig position in relation to the fin position - for example where we move the mast foot forwards a touch when the board starts railing or tailwalking on too long a fin.
On slalom gear, for-and-aft board trim is now controlled by fin rake and by the amount of downhaul applied to the slalom rig.
On wave and freestyle gear, for-and-aft trim is easily controlled by us leaning forwards more - now easier with the upright stance used.
None of this is to diss older gear. You can still have a lot of fun on older gear and there are plenty of great older boards you can pick up cheap at a fraction of the price of a new board.
The quality of your windsurf session will usually be a function of wind strength, waves, and sunshine, rather than being determined by the age of your gear.