15 knots plus is a lot of wind. It helps to begin with a lot of boatspeed to make it through that kind of wind and associated waves, especially with full crew weight. Also, it helps to act more aggressively and quicker in order to minimize the time you're exposed to the forces trying to stop you (as opposed to finessing though the turn in lighter air). To maximize speed, initiate the turn from out on the wire (takes some practice). My sequence (as skipper) is begin turn, come in, keep turning, cut mainsheet (so as not to weathervane), keep turning, unhook, keep turning, make sure we've come across enough to complete the tack and that the jib is in on the new side, keep turning, then cross under boom and sheet main. For me, the worst part is if I can't unhook cleanly.....then I'm stuck to the trap wire, I'm on the leeward side of the boat, and I've got the boom coming at my face.

Lots of other good advice above, too, except I disagree with backwinding the jib. As mmadge says, fly the jib through the tack. (BTW...Rick White says the same...buy his books/videos on this site, and learn to do it right!) Backwinding is great....for going backwards. It may eventually push the bows over but only after it's killed what little momentum you had left after dragging two hulls through different arcs and pointing straight into the wind/waves for a couple of seconds.

If you stall, immediately reverse the rudders, and you'll back into the tack you were attempting to take. (In 15 knots, you won't even have to backwind the jib!)

Jerome Vaughan
Hobie 16
Clinton, Mi'sippi