New blade jib

As some may remember, I have been looking into a new jib for my Lapworth-36 Papoose. I am getting close. I have settled on a Quantum product called Fusion MX which is a laminate of Dacron cloth, mylar, Dacron threads, mylar, and Dacron cloth. I think they call it polyester instead of Dacron but that is probably because Dacron is TM. This is similar to racing laminates except that it has polyester threads instead of spectra or carbon and the threads are tri-radial (straight) instead of curved. I am going with the polyester to give a little more give so the wood doesn't come apart, plus it is cheaper. To accomplish this, I need to add an inboard track and was concerned about the sail fitting inside the lower forward shroud. I made careful measurements and put together a 3-D model using a free program called Google SketchUp. I got typical sail shape parameters from Quantum and used a program called SailCut CAD and adjusted the parameters in the program until it produced a sail shape similar to what Quantum specified. I thought people might enjoy the 1 1/2 min video. Any comments about what I am thinking of doing are always welcome. There are two remaining questions before I order. 1) How much forestay sag should I design in. I need a windy day to go take some pictures but there is usually not enough or too much wind this time of year. and 2) How much, if any, should I design the sail around some inhauler pressure on the clew. I think I can get a sheeting angle of 13 degrees without the inhauler and somewhere between 10 and 11 degrees with the inhauler before the sheet would rub paint off the cabin side. http://www.youtube.com/watch?v=K7vjULz5-NY Allen

Allen, Very cool video. I think you have the first aerobatic lapworth boat of which I'm aware! Jerry --- On Thu, 1/14/10, Allen Edwards <al… [at] PaloAltoPhoto.com> wrote: From: Allen Edwards <al… [at] PaloAltoPhoto.com> Subject: [Cal_Boats] New blade jib To: Ca… [at] yahoogroups.com Date: Thursday, January 14, 2010, 6:32 PM As some may remember, I have been looking into a new jib for my Lapworth-36 Papoose. I am getting close. I have settled on a Quantum product called Fusion MX which is a laminate of Dacron cloth, mylar, Dacron threads, mylar, and Dacron cloth. I think they call it polyester instead of Dacron but that is probably because Dacron is TM. This is similar to racing laminates except that it has polyester threads instead of spectra or carbon and the threads are tri-radial (straight) instead of curved. I am going with the polyester to give a little more give so the wood doesn't come apart, plus it is cheaper. To accomplish this, I need to add an inboard track and was concerned about the sail fitting inside the lower forward shroud. I made careful measurements and put together a 3-D model using a free program called Google SketchUp. I got typical sail shape parameters from Quantum and used a program called SailCut CAD and adjusted the parameters in the program until it produced a sail shape similar to what Quantum specified. I thought people might enjoy the 1 1/2 min video. Any comments about what I am thinking of doing are always welcome. There are two remaining questions before I order. 1) How much forestay sag should I design in. I need a windy day to go take some pictures but there is usually not enough or too much wind this time of year. and 2) How much, if any, should I design the sail around some inhauler pressure on the clew. I think I can get a sheeting angle of 13 degrees without the inhauler and somewhere between 10 and 11 degrees with the inhauler before the sheet would rub paint off the cabin side. http://www.youtube. com/watch? v=K7vjULz5- NY Allen

Just an aerobatic camera position :-) The boat was well grounded in the virtual ocean. On Thu, Jan 14, 2010 at 7:16 PM, Gerald Sobel <so… [at] yahoo.com> wrote: > > > Allen, > Very cool video. I think you have the first aerobatic lapworth boat of > which I'm aware! > Jerry > > --- On *Thu, 1/14/10, Allen Edwards <al… [at] PaloAltoPhoto.com>*wrote: > > > From: Allen Edwards <al… [at] PaloAltoPhoto.com> > Subject: [Cal_Boats] New blade jib > To: Ca… [at] yahoogroups.com > Date: Thursday, January 14, 2010, 6:32 PM > > > > > As some may remember, I have been looking into a new jib for my Lapworth-36 > Papoose. I am getting close. I have settled on a Quantum product called > Fusion MX which is a laminate of Dacron cloth, mylar, Dacron threads, > mylar, and Dacron cloth. I think they call it polyester instead of Dacron > but that is probably because Dacron is TM. This is similar to racing > laminates except that it has polyester threads instead of spectra or carbon > and the threads are tri-radial (straight) instead of curved. I am going > with the polyester to give a little more give so the wood doesn't come > apart, plus it is cheaper. To accomplish this, I need to add an inboard > track and was concerned about the sail fitting inside the lower forward > shroud. I made careful measurements and put together a 3-D model using a > free program called Google SketchUp. I got typical sail shape parameters > from Quantum and used a program called SailCut CAD and adjusted the > parameters in the program until it produced a sail shape similar to what > Quantum specified. I thought people might enjoy the 1 1/2 min video. Any > comments about what I am thinking of doing are always welcome. There are > two remaining questions before I order. 1) How much forestay sag should I > design in. I need a windy day to go take some pictures but there is usually > not enough or too much wind this time of year. and 2) How much, if any, > should I design the sail around some inhauler pressure on the clew. I think > I can get a sheeting angle of 13 degrees without the inhauler and somewhere > between 10 and 11 degrees with the inhauler before the sheet would rub paint > off the cabin side. > > http://www.youtube. com/watch? v=K7vjULz5- NY<http://www.youtube.com/watch?v=K7vjULz5-NY> > > Allen > > > >

I have often grounded my boat in the Chesapeake as well. :- ] Cheers Charlie From: Ca… [at] yahoogroups.com [mailto:Ca… [at] yahoogroups.com] On Behalf Of Allen Edwards Sent: Thursday, January 14, 2010 11:12 PM To: Ca… [at] yahoogroups.com Subject: Re: [Cal_Boats] New blade jib Just an aerobatic camera position :-) The boat was well grounded in the virtual ocean. On Thu, Jan 14, 2010 at 7:16 PM, Gerald Sobel <so… [at] yahoo.com<mailto:so… [at] yahoo.com>> wrote: Allen, Very cool video. I think you have the first aerobatic lapworth boat of which I'm aware! Jerry --- On Thu, 1/14/10, Allen Edwards <al… [at] PaloAltoPhoto.com> wrote: From: Allen Edwards <al… [at] PaloAltoPhoto.com> Subject: [Cal_Boats] New blade jib To: Ca… [at] yahoogroups.com<mailto:Ca… [at] yahoogroups.com> Date: Thursday, January 14, 2010, 6:32 PM As some may remember, I have been looking into a new jib for my Lapworth-36 Papoose. I am getting close. I have settled on a Quantum product called Fusion MX which is a laminate of Dacron cloth, mylar, Dacron threads, mylar, and Dacron cloth. I think they call it polyester instead of Dacron but that is probably because Dacron is TM. This is similar to racing laminates except that it has polyester threads instead of spectra or carbon and the threads are tri-radial (straight) instead of curved. I am going with the polyester to give a little more give so the wood doesn't come apart, plus it is cheaper. To accomplish this, I need to add an inboard track and was concerned about the sail fitting inside the lower forward shroud. I made careful measurements and put together a 3-D model using a free program called Google SketchUp. I got typical sail shape parameters from Quantum and used a program called SailCut CAD and adjusted the parameters in the program until it produced a sail shape similar to what Quantum specified. I thought people might enjoy the 1 1/2 min video. Any comments about what I am thinking of doing are always welcome. There are two remaining questions before I order. 1) How much forestay sag should I design in. I need a windy day to go take some pictures but there is usually not enough or too much wind this time of year. and 2) How much, if any, should I design the sail around some inhauler pressure on the clew. I think I can get a sheeting angle of 13 degrees without the inhauler and somewhere between 10 and 11 degrees with the inhauler before the sheet would rub paint off the cabin side. http://www.youtube. com/watch? v=K7vjULz5- NY<http://www.youtube.com/watch?v=K7vjULz5-NY> Allen