i like to break the downwind carve 360 into two separate, but related, parts. There's a planing board/foot steering part, and there's a non-planing sail steering finish. This transition from foot steering to sail steering can occur at different spots in the trick depending on a lot of factors like:
- -how much speed to take into the turn
- -how good is your carve
- -the relative speed for the wind strength
- -how your board carves and glides
i.e. this transition from board to sail steering will happen at a different time each time you try it, especially when learning
for the carving portion, you want glide and steady rail pressure with minimal input from the sail. keep the sail neutral and try not to let the sail get backwinded much. In higher winds the sail must be kept really low, but in lighter winds it can be a bit more upright. when you get past say 45 degrees off the wind on the new tack and are heading back up toward a beam, the COE of the sail needs to be behind the mast base and over the tail of your board. If it's forward, the push of the backwinded sail actually forces the nose of your board back off the wind, and this effect will magnify when your board stops gliding and sail steering takes over
Once you stop gliding you can flatten out the board a bit and backwind the sail over the back of your board. Being comfortable sail steering backwinded will really help you complete this trick. You can practice this in light wind by trying heli-tacks and sailing backwinded and changing your point of sail.
Once you get good at the 360, it's fun on smaller gear in higher wind and feet in both footstraps. A classic trick that never gets old. Fun for freestylers as you can use it as a setup for tricks like switch konos, and really fun on a foil board as you can foil all the way through and out (if you know what you're doing like Tony Logosz).