tag:blogger.com,1999:blog-7334230772332433270.post2212646547981358292..comments2024-02-27T11:15:46.473-06:00Comments on Quidnon: Parbuckle and LaunchDmitry Orlovhttp://www.blogger.com/profile/00381674543530177679noreply@blogger.comBlogger40125tag:blogger.com,1999:blog-7334230772332433270.post-46936285025404844162017-06-21T09:06:25.301-06:002017-06-21T09:06:25.301-06:00Try this one: https://youtu.be/qmLP1UALiZATry this one: https://youtu.be/qmLP1UALiZADmitry Orlovhttps://www.blogger.com/profile/00381674543530177679noreply@blogger.comtag:blogger.com,1999:blog-7334230772332433270.post-74456081877640677372017-06-21T08:02:00.634-06:002017-06-21T08:02:00.634-06:00Dmitry,,,
https://dl.dropboxusercontent.com/u/8608...Dmitry,,,<br />https://dl.dropboxusercontent.com/u/8608653/MVI_0322.m4v<br />An update might be in order:<br />"Sorry, that file doesn’t live here anymore. It might have been moved or made private."<br />best regards,,,locojhonlocojhonhttps://www.blogger.com/profile/11778383994316609450noreply@blogger.comtag:blogger.com,1999:blog-7334230772332433270.post-40416566083408052672017-02-22T19:48:07.702-06:002017-02-22T19:48:07.702-06:00Hi,
Where in/around Cambridge,Washington County, N...Hi,<br />Where in/around Cambridge,Washington County, N.Y. can one learn how to sail(however basic and/or brief the instruction)? Anonymoushttps://www.blogger.com/profile/11559056026140201477noreply@blogger.comtag:blogger.com,1999:blog-7334230772332433270.post-65411557780910120472017-02-13T11:17:13.733-06:002017-02-13T11:17:13.733-06:00https://dl.dropboxusercontent.com/u/8608653/MVI_03...https://dl.dropboxusercontent.com/u/8608653/MVI_0322.m4vDmitry Orlovhttps://www.blogger.com/profile/00381674543530177679noreply@blogger.comtag:blogger.com,1999:blog-7334230772332433270.post-59205056290020855472017-02-13T11:09:53.862-06:002017-02-13T11:09:53.862-06:00Could we please see it?
Thanks, Dmitry.Could we please see it?<br />Thanks, Dmitry.ftm1776https://www.blogger.com/profile/08423156491278870400noreply@blogger.comtag:blogger.com,1999:blog-7334230772332433270.post-41124425077904740822017-02-10T13:01:05.951-06:002017-02-10T13:01:05.951-06:00Thank you for doing the math. Looks like 2 4-ton c...Thank you for doing the math. Looks like 2 4-ton cable pullers on each side would have better than a 50% margin of safety.<br /><br />As you point out, the bottom edge has to be secured against slippage. Those are the red lines shown on the diagrams.<br />Doing this operation between two large trees would work well.Dmitry Orlovhttps://www.blogger.com/profile/00381674543530177679noreply@blogger.comtag:blogger.com,1999:blog-7334230772332433270.post-50931642014786381842017-02-10T12:00:44.355-06:002017-02-10T12:00:44.355-06:00Well, fwiw, I actually am an engineer but not a st...Well, fwiw, I actually am an engineer but not a structural engineer. <br /><br />The worst-case load for the green line should be right before the very end, when it's just above horizontal. <br /><br />Using small angle approximations, and assuming center of gravity is on the centerline of the box (CG height doesn't matter), the balance comes out as:<br /><br />Green Load * Box_Height = Total_Mass * (Box_Width /2)<br /><br />So <br /><br />Green Load = 1/2*Mass*(Width/Height)<br /><br />So if it's twice as wide as high, then Green Load = mass.<br /><br />This load will be very roughly the same for the last 10-15 degrees or so. If we take into account the green line's actual angle, the worst case load would be a touch worse too (but not by much). Extra load from bounce due to stretchy line, however, would be a consideration.<br /><br />Also the implication is something must create an equal sideways force on the corner contacting the ground, to prevent slipping. (may be good to have an anchor point for the unloaded-side line line down low for this purpose). Setting up between 2 really big trees seems like the sanest way . . . aaahttps://www.blogger.com/profile/12536119721214682609noreply@blogger.comtag:blogger.com,1999:blog-7334230772332433270.post-58669900212670546592017-02-10T08:04:20.660-06:002017-02-10T08:04:20.660-06:00Those sorts of details are still to be worked out....Those sorts of details are still to be worked out. In general, with 3 comealongs working in parallel in each direction, they can be moved as often as needed. And, yes, we will never be pulling on more than 3 tons.Dmitry Orlovhttps://www.blogger.com/profile/00381674543530177679noreply@blogger.comtag:blogger.com,1999:blog-7334230772332433270.post-50892175313402033122017-02-09T22:42:11.739-06:002017-02-09T22:42:11.739-06:00Actually, I'd guess that the max tension would...Actually, I'd guess that the max tension would be on the blue lines just after frame #1. But the photos don't show a reciprocal operation. Why would we cross over with the blue lines to the far corner in frame #1, but not do the same thing in decent with green lines in frame #5? The frames never show us moving the attachment point for blue, but we move green's attachment point twice. It seems to me that we should be able to use the attachment points in frame #2 and never move either set of lines during the entire operation.MoonShadowhttps://www.blogger.com/profile/07026735575577934205noreply@blogger.comtag:blogger.com,1999:blog-7334230772332433270.post-40949099802352210172017-02-09T22:34:46.324-06:002017-02-09T22:34:46.324-06:00"It looks like the configuration pictured wil..."It looks like the configuration pictured will load the lines up more than the weight of the load (e.g., green line, second to last image in sequence)."<br /><br />Looking at that, I disagree. Roughly half of the weight should still be on the right corner of the frame. The angle of the vector force from the horizontal would increase the tension over that half-weight by a bit, but not by enough to increase tension beyond the actual weight of the hull. And Dmitri is actually calling for about 6 tons worth of come-alongs to hold that 3 ton object. Do we have a structural engineer in the house to actually determine the max force vector on these lines during this kind of operation?MoonShadowhttps://www.blogger.com/profile/07026735575577934205noreply@blogger.comtag:blogger.com,1999:blog-7334230772332433270.post-75924675251590385402017-02-09T20:39:03.777-06:002017-02-09T20:39:03.777-06:00mmm. heavily loaded comealongs can get scary, imo....mmm. heavily loaded comealongs can get scary, imo. paying out under tension... there's a lot of energy ready to be released by those little stamped out ratchet parts. <br /><br />Good low budget solution though. The usual principles apply though - is saving a few $$ on the flipping operation really worth the cost of the entire hull?<br /><br />It looks like the configuration pictured will load the lines up more than the weight of the load (e.g., green line, second to last image in sequence).<br /><br />The same come-along could be used to drive something like a scissors-jack. Or lift with just one linkage in compression, using a wheel on the end of the linkage on the ground, with the comealong pulling the ground end "inwards", causing the elevated end to rise and lift the load. Just as your solution, the the second phase, where you're letting the load down, is the scarier one, IMO.<br /><br />Also, creative use of a good old car jack and jack stands and two-by's may go a long way.<br /><br />A chain hoist may be gentler than a comealong too. Also I'd say steel cable vs nylon.<br /><br />-or- <br /><br />(for the truly redneck)<br /><br />big tree + vehicleaaahttps://www.blogger.com/profile/12536119721214682609noreply@blogger.comtag:blogger.com,1999:blog-7334230772332433270.post-69801308277801261082017-02-09T17:20:10.892-06:002017-02-09T17:20:10.892-06:00Very happy to hear that! Keep us posted on your de...Very happy to hear that! Keep us posted on your developments.Dmitry Orlovhttps://www.blogger.com/profile/00381674543530177679noreply@blogger.comtag:blogger.com,1999:blog-7334230772332433270.post-68807055489930107922017-02-09T17:02:48.830-06:002017-02-09T17:02:48.830-06:00Am definitely going to build the Quidnon. But it m...Am definitely going to build the Quidnon. But it may be some months away till plans become available to purchase, etc..<br /><br />So to hone my skills, i am preparing to build a smaller boat. It is a trimaran called the 'Seaclipper 16' using plywood and epoxy and the rigging gear of a 'Hobie 14'.<br /><br />http://www.searunner.com/index.php/seaclipper-16-oc<br /><br />I am in touch with the designer to see if the plans can be converted to g-code to mill on a CNC machine.<br /><br />I hope to have this built by the late Autumn. Anonymoushttps://www.blogger.com/profile/09732589907872908956noreply@blogger.comtag:blogger.com,1999:blog-7334230772332433270.post-4417413694033613592017-02-09T13:16:07.125-06:002017-02-09T13:16:07.125-06:00I set up a 1:12 model with RC controls and sailed ...I set up a 1:12 model with RC controls and sailed it around. It went to windward and short-tacked very well.Dmitry Orlovhttps://www.blogger.com/profile/00381674543530177679noreply@blogger.comtag:blogger.com,1999:blog-7334230772332433270.post-65160893054315611412017-02-09T12:18:36.518-06:002017-02-09T12:18:36.518-06:00When will we see a sailing model, Dmitry??
Excitin...When will we see a sailing model, Dmitry??<br />Exciting project!!!<br />Thomas<br />Vancouver, WAftm1776https://www.blogger.com/profile/08423156491278870400noreply@blogger.comtag:blogger.com,1999:blog-7334230772332433270.post-77132059096543719752017-02-09T09:48:38.040-06:002017-02-09T09:48:38.040-06:00The ratcheting comealongs are very cheap. Northern...The ratcheting comealongs are very cheap. Northern Tool currently has 2-ton ones for $10 each. So, it will be possible to use 3 comealongs in parallel, making it easy to detach and reattach them when their stroke gets maxed out.Dmitry Orlovhttps://www.blogger.com/profile/00381674543530177679noreply@blogger.comtag:blogger.com,1999:blog-7334230772332433270.post-39939345723031588742017-02-09T09:46:23.323-06:002017-02-09T09:46:23.323-06:00There are two reasons to use nylon. First, the lin...There are two reasons to use nylon. First, the lines can be reused as dock lines. Second, the stretch makes it easier to distribute tension across several lines and comealongs.Dmitry Orlovhttps://www.blogger.com/profile/00381674543530177679noreply@blogger.comtag:blogger.com,1999:blog-7334230772332433270.post-62488787043342590992017-02-09T08:55:50.305-06:002017-02-09T08:55:50.305-06:00My 37X10 sharpie hull build used tires on the flip...My 37X10 sharpie hull build used tires on the flip and no problems at all. Pick the choicest one later for a blue collar sea anchor :)Robertohttps://www.blogger.com/profile/18320063715736110902noreply@blogger.comtag:blogger.com,1999:blog-7334230772332433270.post-50887643559676746202017-02-09T07:02:24.626-06:002017-02-09T07:02:24.626-06:00Nylon rope might not be the best choice because it...Nylon rope might not be the best choice because it stretches, causing some loss of control. Something like double braid polyester would be better: https://www.knotandrope.com/Store/pc/5-8-quot-Pulling-Rope-9p656.htmSuwannee Davehttps://www.blogger.com/profile/08920710561840672218noreply@blogger.comtag:blogger.com,1999:blog-7334230772332433270.post-36307980301501544272017-02-08T20:54:50.340-06:002017-02-08T20:54:50.340-06:00So far you have developed a very compelling projec...So far you have developed a very compelling project.<br />Kind of like raising a timber frame barn.<br />If you gather enough man power it will be a party.<br />Just muscles, levers and rope, some good food and drink and some good common sense and it will be a joyful experience for all.Anonymoushttps://www.blogger.com/profile/12793373764373588551noreply@blogger.comtag:blogger.com,1999:blog-7334230772332433270.post-65151650194081162272017-02-08T18:13:21.362-06:002017-02-08T18:13:21.362-06:00The only problem that I see is that all of the con...The only problem that I see is that all of the consumer grade come-alongs I have experience with only have a working stroke of about 10 to 15 feet. Would this be enough to flip a 3 ton object, that is 16 feet wide? Seems like it would require reconnecting each of the come-alongs at least once during the process. Might not be a deal breaker, but couldn't we do pretty much the same thing using our blocks & lines, which we will need to buy anyway? A set of ratcheting come-alongs would be much safer for this operation, I'd admit, and owning at least one on a boat isn't a bad idea.MoonShadowhttps://www.blogger.com/profile/07026735575577934205noreply@blogger.comtag:blogger.com,1999:blog-7334230772332433270.post-58796766526476081062017-02-08T15:12:03.534-06:002017-02-08T15:12:03.534-06:00No mess? If you know where you can "borrow&qu...No mess? If you know where you can "borrow" used tires for less than the cost of a dozen or so hay bales, I say go for it. Otherwise, busted straw bales are easy enough to clean up. You just rake them up like leaves and toss them into the woods, or even the water. They are naturally composting, and do they do not stink doing it.MoonShadowhttps://www.blogger.com/profile/07026735575577934205noreply@blogger.comtag:blogger.com,1999:blog-7334230772332433270.post-80445638326643875162017-02-08T15:10:08.029-06:002017-02-08T15:10:08.029-06:00As far as assembling the hull right-side-up, that ...As far as assembling the hull right-side-up, that simply can't be done. It all starts with a flat surface, which is the deck. Everything is built on top of it. Sides and bottom are cold-molded into place. There is simply no way to do that unless the hull is inverted.Dmitry Orlovhttps://www.blogger.com/profile/00381674543530177679noreply@blogger.comtag:blogger.com,1999:blog-7334230772332433270.post-54705474309924451262017-02-08T15:07:16.532-06:002017-02-08T15:07:16.532-06:00At each stage of the parbuckling operation, there ...At each stage of the parbuckling operation, there are at least 2 1/2" nylon 3-strand ropes, probably 3, attached to the the edge that the cage is being tipped over, run out to both sides. This should definitely prevent all slippage. They are shown in red on the diagrams.Dmitry Orlovhttps://www.blogger.com/profile/00381674543530177679noreply@blogger.comtag:blogger.com,1999:blog-7334230772332433270.post-71213492426131675892017-02-08T15:06:47.492-06:002017-02-08T15:06:47.492-06:00That's likely due to the difficulty, and hazar...That's likely due to the difficulty, and hazard, involved in layering, glassing, coating, repeating and finally covering the hull with heavy copper sheets while lying on your back with a 3 ton object suspended a foot above your face. I like Dmitri's idea better.MoonShadowhttps://www.blogger.com/profile/07026735575577934205noreply@blogger.com