Re: Yacht Design Considrations (Chris C) (Was Bill Lapworth and Jack Jensen)

Re: Yacht Design Considrations (Chris C) (Was Bill Lapworth and Jack Jensen)

2 messages2006-10-25 16:23 through 2006-10-26 13:48

Re: Yacht Design Considrations (Chris C) (Was Bill Lapworth and Jack Jensen)

mtkennedy12006-10-25 16:23
--- In Ca… [at] yahoogroups.com, "Bruce Stirling" <bruce@...> wrote: > > > > mtkennedy1 wrote: > > It went over in a jibe broach and stayed down. I had to climb the cockpit > backrests to get to the high side and release the vang. It came back up and > away we went. > > . > Mike, and others, > > I really enjoy reading your tales of adventure on the high seas. I read > them to Debbie and it scares the hell out of us trying to imagine being in a > similar situation. But help me out here, what does "releasing the vang" do > to help get the boat back up? The boat rolls over and jibes but the main is held by a vang-preventer. When you are running near dead-down, there is a risk of accidental jibe. If it is windy, a jibing boom can knock you overboard or even kill. I was in a rare windy Newport Beach race in the late eighties where a guy on another boat was knocked in the head by a jibing boom in about 25 knots of wind. They hauled him out of the water but he was dead. Probably drowned and was unconscious when he went in. We had rigged the multi-purchase vang as a preventer by attaching it to a pad eye near the rail. Even in a boat with a rigid or hydraulic vang, we rig a preventer when running on a broad reach. Anyway, the boat jibed and went flat in the water. The wind was holding the mast down because the main was up in the air and pushing us down. We were side-on to the wind which was about 25-30. I had to get to the vang-preventer and release it so the boom and mainsail could fall down and let the mast come up. To do that, I had to climb the cockpit by grabbing the backrests. It took about a half a minute but it seems longer at the time. The newer boats are so fast that you rarely get the apparent wind aft of the beam. That's why the asymmetricals work on them. Even in the Choate 40 we never trimmed the pole much aft of 45 degrees. The true wind would be 150 but the apparent about 90. We were doing 15 knots in 25 to 30 knots of true wind. A Yankee 38 wouldn't go over 12 no matter how hard it blew. The main was trying to go faster than the hull, hence the squirrel chase. I'd read somewhere about immediately swimming > to the top of the mast with a lifejacket to keep the boat from going turtle. > I've never experienced trying to right a boat after laying her over, not > even a Hobie. I once thought that a good thing, but I envy your > experience. Once is enough. Mike Jr is the expert on dismasting and I hope it stays that way. Mike Kennedy Conquest Cal 40 # 96

Re: Yacht Design Considrations (Chris C) (Was Bill Lapworth and Jack Jensen)

michaelkennedy052006-10-26 13:48
> > The boat rolls over and jibes but the main is held by a vang- preventer. When you are > running near dead-down, there is a risk of accidental jibe. If it is windy, a jibing boom can > knock you overboard or even kill. > > The newer boats are so fast that you rarely get the apparent wind aft of the beam. That's > why the asymmetricals work on them. Even in the Choate 40 we never trimmed the pole > much aft of 45 degrees. The true wind would be 150 but the apparent about 90. We were > doing 15 knots in 25 to 30 knots of true wind. A Yankee 38 wouldn't go over 12 no matter > how hard it blew. The main was trying to go faster than the hull, hence the squirrel chase. > Even without a preventer on, if you round up and the boat heels enough for the end of the bom to hit the water, the water keeps the boom from going out any further, and the vang keeps the boom from going up out of the water and dumping the main, and dthe main stays full and keeps you down. Blowing vang unloads the leech of the main and lets the boat get back up. > > Once is enough. Mike Jr is the expert on dismasting and I hope it stays that way. > I don't know that I have as much expertise as some, but here's hoping I don't develop any more. Especially since next time I sail to Hawaii I'm dragging Dad with me. > > Mike Kennedy Jr. > Conquest Cal 40 # 96 >