Tom Lathrop Posted April 5, 2011 Report Share Posted April 5, 2011 Hot air? Well there is quite a bit of that around here sometimes too. Extending your boating season around the southern end of Pamlico Sound today will need more boots than outboards. If that southwest wind blows any harder I'll be planting tomatoes where the creek used to be. Come to think about it Mike, all that wind is coming from down Crystal Coast way. Quote Link to comment Share on other sites More sharing options...
hokeyhydro Posted April 5, 2011 Report Share Posted April 5, 2011 Yes, wind tide. I'm a coastal rat and misspent my youth on various coastal bays, which had moon tides. Wind tides are new to me. Rather than check the tide table I check wind direction - strange. Quote Link to comment Share on other sites More sharing options...
MisterMoon Posted April 7, 2011 Author Report Share Posted April 7, 2011 Turns out you can pull the CB from the top of the trunk. And I think I found my vibration problem. The board was only barely faired. The photo is of the trailing edge. The trailing edge is about 1" thick. The leading edge isn't much better. I'm about to have it pay a visit to my power planer. Quote Link to comment Share on other sites More sharing options...
Kyle H. Posted April 8, 2011 Report Share Posted April 8, 2011 Turns out you can pull the CB from the top of the trunk. And I think I found my vibration problem. The board was only barely faired. The photo is of the trailing edge. The trailing edge is about 1" thick. The leading edge isn't much better. I'm about to have it pay a visit to my power planer. Gotta love that picture: acoustic guitar, concert piano, oriental rug, and the centerboard...what class! Kyle #44 Quote Link to comment Share on other sites More sharing options...
MisterMoon Posted April 8, 2011 Author Report Share Posted April 8, 2011 ...what class! You're going to give people the wrong impression about me! Here it is now, a little better. I think I'm going to have to go back and straighten up that trailing edge, though. Quote Link to comment Share on other sites More sharing options...
hokeyhydro Posted April 8, 2011 Report Share Posted April 8, 2011 Looking better. Since I'm a Luddite and use manual tools - drawknife and a variety of planes - I mark the board blank. Flat on a table/workbench I use a fine line marker and draw the centerline of the board thickness. Then I hack and plane both sides until I'm close to the mark, which is straight unless I was over caffeinated when I drew it. I also try to get a nice smooth foil curve fore and aft, although as Tom pointed out it is not all that necessary. If a true foil improves performance said increase in performance would be measured in micro-knots. Not worth the effort but I do it anyway because I like a board with sweet curves, just like I like my women. Quote Link to comment Share on other sites More sharing options...
MisterMoon Posted April 8, 2011 Author Report Share Posted April 8, 2011 SHould I taper the bottom edge? Quote Link to comment Share on other sites More sharing options...
Scott Dufour Posted April 9, 2011 Report Share Posted April 9, 2011 Back to the "how to get the centerboard out" discussion: to get under Rocinante, I just pull/push her off the trailer onto the grass and roll her on a gunnel with a 2x4 to keep her from going too far over if necessary. It allows me to paint her bottom, check the centerboard, install a half-round back to the keel... I wouldn't leave her on her gunnel for months at a time, but to make necessary repairs, why not? Quote Link to comment Share on other sites More sharing options...
hokeyhydro Posted April 9, 2011 Report Share Posted April 9, 2011 SHould I taper the bottom edge? I do not "taper" the bottom edge. I round it off. No science reason, but I glass strip laminated rudders and boards so I round the bottom enough to allow the glass to wrap. Quote Link to comment Share on other sites More sharing options...
MisterMoon Posted April 11, 2011 Author Report Share Posted April 11, 2011 Got the boat out today to test the centerboard. No vibration at all now. Now on to tidying up the rigging... Quote Link to comment Share on other sites More sharing options...
MisterMoon Posted April 29, 2011 Author Report Share Posted April 29, 2011 Had a really good sail today on my new boat. I've put better blocks on the snotters, put the motor on a lifting mount and re- did the mizzen sheet. This boat is seriously quick. I'm very pleased. Getting her up on plane at about 8.5 knots on a reach is very cool. I sailed in company with a Catalina 22 and an a Hunter 23.5 and we just blew them all away on every point of sail. I don't think either boat was very well sailed, but it was satisfying anyway. The snotters are a revelation! Adjusting them to varying wind velocities has a huge impact. I do plan to double end the one on the main so I can easily adjust that one on either tack. Quote Link to comment Share on other sites More sharing options...
john moffat Posted May 25, 2011 Report Share Posted May 25, 2011 R: Tom Lathrops comments about adding lead to a Lapwing centreboard. Would be interested in the details. John, I might have a few tremors using those little web ratchets too. Its too easy to miss a step and range is not great. I use a lot of come-alongs in my shop to lift machinery up when preparing for hurricanes so there are at least five of them hanging around. I lifted so many boats off trailers over the years that I just don't worry about it anymore. Heaviest boat lifted so far was a 26' sailboat of about 5000 lbs. I do add vertical supports under the roof collar beams when lifting a heavy boat inside. The Bluejacket 24 is about 2400 lbs when I lift it with the com-alongs. When I added lead to Lapwing's CB, I just lifted the boat under the deck using a sawhorse and a handy billy. If the vibration is bad upwind, it is most certainly caused by vortex shedding. How to fix it is trial and trial again. Lots of theories but no one fix ever cures all. In any case, the problem is likely to be near the tip. Before doing any extensive work on the board, I would try adding something on one side near the trailing edge. Try taping a 6" long piece of string parallel to and just forward of the edge. Might disrupt the vortex and lead to a solution. As for the perfect cross section for a centerboard, I've seen too many races won by boats using what would be called poor shapes to believe that it is a critical item. Using your head and going the right way is far more important than any single item like foil shape. Personally, I do not understand hauling an outboard motor on these small boat transoms, but I guess that is just my hangup. There have been more motors on small sailboats on this forum than I've seen in almost 50 years of sailing. Quote Link to comment Share on other sites More sharing options...
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