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mike160304 |
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I have sawn my spruce lengths into 5mm thick strips for the laminated frame.
Here's a pic of my 32' saw lane, set up to saw three 16'x22mmx22mm spruce lengths into 5mm strips for the lamination. This has gone well and the strips are very appealing! I'm working on the gluing set-up now. The saw lane is based on 3 "Workmates" and a 1970s Black & Decker drill/circular saw attachment set up as a DIY saw table. The rip blade has a nice narrow 1.5mm kerf, which saves wood. https://groups.yahoo.com/neo/groups/SFD_builders_sailors/photos/photostream/lightbox/591966427?orderBy=mtime&sortOrder=desc&photoFilter=ALL#zax/591966427 Regards, Mike |
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mike160304 |
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In reply to this post by mike160304
RE CENTREBOARDS, etc: I shall start with one pivoting leeboard in my Surf 8. I can always cut later for a daggerboard (I don't like them, except on water where the depth is reliable) or even a centreboard, but a centreboard case and centreboard means more clutter in the middle of the boat, and more weight when putting the boat on the cartop, whereas a leeboard and even its mounting plate goes in the boot/trunk and carries separately to the water. I don't want the "carrying weight" of my hull to exceed 50 lb, and I would like it to be less. The cut-out plywood so far weighs 22.3 lb.
I have some light 3.15mm plywood here, and I shall use that for the skin of my rudder stock and for the foils of my rudder and leeboard. The 2 foils will be hollow, built like a Spitfire's wing. These are buoyant foils, not counterweights. For my balance squaresail rig, centre of effort is well forward of the main seat/ thwart/ frame. It is tempting to mount a leeboard "on the end of the main frame" because of structure and the fact that the gunwales are parallel there, but per my experience it may need to be 12-24" forward of that, for my rig anyway, so the mounting has to be angled out from the gunwale accordingly. I would like to be able to mount and unmount the whole leeboard system from inside the boat, for obvious reasons. Regards, Mike |
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mike160304 |
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In reply to this post by mike160304
LEEBOARDS 2 - I worked through all the "foil" options - the pros and cons of centreboards, daggerboards, leeboard/leeboards - before deciding on a single leeboard, the pros and cons are all valid, and you back whichever horse looks best to you.
In overall concept, both the 4' 6" coracle and the Surf 8', with flat bottoms and firm bilges, and with a solo helmsman weighing from 2.5 times to 5 times the all-up weight of the boat, can be sailed pretty flat most of the time, even in brisk breezes, and even with a relatively large sail area. So this is not like a keelboat where the angle of heel would make a leeboard on the weather side inoperative. But the Surf 8 is designed to take a centreboard, daggerboard, leeboard or 2 leeboards, as desired. Surf 8 can also be built light or heavy, will dance when sailed solo, will lug 4 people out to a yacht, and will sail, row, scull or motor. She is a world class, universal design, and her design is about 70 years younger than other well known 8-footers. Regards, Mike |
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Paul H (admin) |
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Lee boards are very flexible, save space and one will be fine.
Just make sure there is a good overlap either side of the pivot bolt. Use old CDs as washers to protect the hull paintwork etc. Pics please! Cheers Paul |
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mike160304 |
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SINGLE LEEBOARD: Thanks Paul, the leeboard itself will not touch the hull. As I explained briefly, it is a pivot plate system, no doubt there will be photos later.
Regards, Mike |
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alopenboat |
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In reply to this post by mike160304
The following are just reminiscences of my youth and probably aren't
relevant but may offer food for thought. As a youth my family had a Percy Blandford 15ft canvas canoe. My brother fitted it for sailing with leeboards fastened by a board clamped across the coaming. It was very successful on lakes and rivers but as soon as we took it on the sea the leeboard broke. There were several failure points. As each was beefed up the next went. The problem was caused by the surging as the boat went over the waves. Even a complete rebuild failed to completely solve the problem. Surge loads can be enormous. The hull was carried on the roof of the car. All the contents (floorboards, seats, backrests, spray cover, paddles, sail rig, rudder, leeboards etc) were carried in the boot. It was a major hassle setting it all up every time and precluded going for a quick half hour sail. I determined then that any future boat I owned would be transported with all gear already aboard so it could be dumped straight into the water at the launch site. This not only speeds things up but also means that it is difficult to forget anything. On 11 Jan 2015 at 20:38, mike160304 [via UK HBBR Forum] wrote: > > RE CENTREBOARDS, etc: I shall start with one pivoting leeboard in my > Surf 8. I can always cut later for a daggerboard (I don't like them, > except on water where the depth is reliable) or even a centreboard, > but a centreboard case and centreboard means more clutter in the > middle of the boat, and more weight when putting the boat on the > cartop, whereas a leeboard and even its mounting plate goes in the > boot/trunk and carries separately to the water. I don't want the > "carrying weight" of my hull to exceed 50 lb, and I would like it to > be less. The cut-out plywood so far weighs 22.3 lb. Sail when you can, row when you must, motor when you have to be at work in the morning. Alastair Law Yeovil, England. <http://www.little.jim.freeuk.com> |
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mike160304 |
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Thanks Alastair, it is all relevant. The external leeboard mounting plate would have 3 fixing points, 2 on the gunwale and the bottom one through the hull to some form of triangulation or reinforcement inside the hull. With a single leeboard, the bottom fixing is obviously pushing on the hull on one tack and pulling on the hull on the other tack, similarly to the forces on a centreboard or daggerboard, so it needs as much engineering as a CB case or DB case.
Re loading everything into the boat, I follow your point, but I might have help with cartopping on one day but be alone on another day. I am thinking of making a kind of "tool roll" out of polytarp and polypropylene tape which would accommodate the spars/sail bundle, oars, leeboard and mounting, rudder and tiller and all the smaller bits, with a good carrying handle. One "con" with a centreboard is that the heavyish CB case is fixed and the CB not usually removed, whereas a leeboard and mounting form a removable weight. But it's all about personal preference, and the Surf 8 handles all forms of foil, except perhaps the Paradox chine runner which usually requires a flat bottom. Mike |
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Randonneur |
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Not sure how Matt Layden attached his lee board to Sand Flea (the ultimate 8' mini cruiser), but it certainly seemed to work OK. He really put it through it's paces on 2 Everglades Challenges including the sial there and back form the East coast of Florida. Apart from anything else, a centre/daggerboard would infringe on the already limited sleeping space in an 8 footer. Something he didn't have to contend with in his Rob Royoid canoe which was essentially a downwind sailer. PP |
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mike160304 |
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Re Sand Flea, Matt Leyden - Wow, yes, that is a different kind of mini-cruiser from the Surf 8. I am surprised that he has room for sun-glasses in that. Reminds me, I must get some sunglasses, for those beach shots, sun or no sun . . . :)
Regards, Mike |
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Randonneur |
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On Tue, Jan 13, 2015 at 3:31 AM, mike160304 [via UK HBBR Forum] <[hidden email]> wrote: Re Sand Flea, Matt Leyden - Wow, yes, that is a different kind of mini-cruiser from the Surf 8. I am surprised that he has room for sun-glasses in that. Reminds me, I must get some sunglasses, for those beach shots, sun or no sun . . . :) I'm sure you've seen these before? PPĀ |
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mike160304 |
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Thanks Pete, no, I had not seen these. I shall enjoy reading them.
Regards, Mike |
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mike160304 |
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In reply to this post by mike160304
I am continuing the Surf 8 build story on the Duckworks Forum only. Hassling with 4 Forums is 4 times worse than hassling with just one. Life is too short.
Regards, Mike |
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