Just found some info for the insane
OK maybe I wont try this...but it does sound like fun....found this snippet in Cruising world archives GETTING HIGH - NATURALLY here's the basics on what's commonly called spinnaker flying: 1) Securely anchor your boat from astern. 2) Tie a spinnaker sheet between two clews of an old spinnaker. The line should be about 1.5 times the distance between the clews - although you'll need to adjust it according to the wind strength. 3) Run the line between the clews through a snatch block, then attach the shackle end of the snatch block to the top of your bosun's chair. 4) Attach a line that's two times the length of the spinnaker luff to one clew. This will be the emergency line to bring a 'flyer' down fast. 5) Hoist the chute about 3/4's of the way up - or whatever height so it can't collapse close enough to the boat to slam a 'flyer' into the bow. 6) Once the chute is hoisted, it should be billowing out well beyond the bow of the boat and the bosun's chair should be dangling in the water. If it's particularly windy, you have to pull the emergency line to collapse the chute to lower the chair into the water. 7) The would-be flyer swims out to the chair, climbs in, and only then begins to center himself/herself between the two clews. Assuming there's enough wind, a centered flyer will be gently lifted into the air. If there's lots of wind, a light flyer will almost instantly be launched as high as the mast or even higher. 8) For added fun, the rider works himself off center to one side and then the other, which results in long arcing rides from one side of the boat to the other - and sometimes jerks the stern anchor free. A good flyer can perform many stunts. 9) When the rider is done or freaks out, they simply pull themselves all the way to one side of the chute, collapsing it. If the flyer is too addled to bring themselves down, whoever is standing watch on the boat pulls hard on the emergency line, which also collapses the chute and quickly drops the rider into the water. In gentle conditions, carefully orchestrated and supervised spinnaker flying is suitable for everyone who is a good swimmer and in decent shape. As the wind speed increases, however, the need for caution and the risk increase dramatically. Strong puffy winds are the most dangerous, as they can easily lead to tremendous free falls followed by abrupt vertical ascents. The main dangers of normal spinnaker flying are getting fingers crushed in the snatch blocks holding the bosun's chair up, free falls wrenching backs, and flyers slamming into a forward part of the boat because the chute was hoisted too high. For samples of this kind of fun, see this month's Changes. Have fun - but be careful!
