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On 2005-05-31, Flying Tadpole wrote:
I sail with arcane rigs, so some of what I do isn't translatable. However, on both the light schooner and Lady Kate the AS29, turning up into a bullet is a recipe for capsize and swamping in the one, and knockdown in the other. The light schooner (a boat requiring crew) as an open and low boat would already be sailing with her lee rail down. A sharp turn into the wind would knock her down further, assisted by a powerful spade rudder tending to act as an elevator plane because of the angle, both reinforcing the knockdown; also stop her dead allowing the waves to take her over also. Bearing away, turning downwind, brings the boat up to level rather than heeled. I'm trying to picture turning up producing more heeling force and having difficulty. I've been sailing dinghies recently and if hit by a gust, feathering up reduces the heeling force whilst bearing away places more of the sail square on to the wind and increases the heeling. How is the schooner different? -- Andy Repton |
#3
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![]() Andy Repton wrote: On 2005-05-31, Flying Tadpole wrote: I sail with arcane rigs, so some of what I do isn't translatable. However, on both the light schooner and Lady Kate the AS29, turning up into a bullet is a recipe for capsize and swamping in the one, and knockdown in the other. The light schooner (a boat requiring crew) as an open and low boat would already be sailing with her lee rail down. A sharp turn into the wind would knock her down further, assisted by a powerful spade rudder tending to act as an elevator plane because of the angle, both reinforcing the knockdown; also stop her dead allowing the waves to take her over also. Bearing away, turning downwind, brings the boat up to level rather than heeled. I'm trying to picture turning up producing more heeling force and having difficulty. I've been sailing dinghies recently and if hit by a gust, feathering up reduces the heeling force whilst bearing away places more of the sail square on to the wind and increases the heeling. How is the schooner different? First, we always sailed her as hard as possible, so anywhere on the wind the lee rail would tend to be a few inches above the water. Think "not much scope for error" Second, the rudder is way aft, deep and powerful, pintle hung and _not_ balanced, carrying over a quarter of the lateral plane the daggerboard carries half-and-a-bit when heeled, and the chine (sharpie hull) carries the rest. Think "lots of water/pressure at the rudder" Third, the boat, though half a ton with a two-up crew, is as rapid in response to helm movement as a small dinghy and will be travelling, in the circumstances described, well over hull speed. 8-12 knots depending on where the wind is. Think "momentum" Putting the helm down to round up, sets the rudder, on an already heeling hull, acting like an elevator plane, heeling the boat further as she starts spinnong ruound. At this point, the lee rail cuts under...boat slows, and blows over (or would, but we've probably let fly the sheets at this point, of up to four sails. Incidentally, the hull shape is sufficiently narrow for its length _not_ to also suddenly transform the boat into a foul mouthed broaching monster, which is what happens to most of the trailable yachts in her sailing grounds. The falling off when hit by a bullet is also a standard catamaran trick, and we used it to the same advantage. Bullet? Fall off, come more upright, pick up speed, come back on course at higher speed. Really too much bullet? Ease the sheet while doing so. Really, really too much bullet? Still fall off to recover, then come to the wind while easing sheets (staying as upright as possible) and heave to to reef. Incidentally, the boat fore-reaches at about 2knots hove-to, so in close proximity to obstacles, reefing is done as fast as possible. More info on the website, from memory -- Flying Tadpole ------------------------- http://www.flyingtadpole.com |
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