no need to check, it's clearly a mix-up with the chord length and the thickness...I have no idea how that got thru unaddressed by the i550 masses. I should have pointed out the mistake when I referrenced the class rules, sorry!!!
there are polars! I cant remember where I saw them...one of the challenges with this build is: there are kernals of wisdom on: -the class site -the yahoo group -two or three different threads on Sailing Anarchy. so I have tried to keep a Build Bibliography, put I am a little behind on that. but anyway, upwind it is just an 18' LWL boat. off the wind, it should plane in about 8 kn true, and really come to life in 12...I'll try to find the polars. forget the canting keel, there's no way that's gonna happen! keel will be a plain old lifting keel, not fixed, havent worked out the mechanics of keeping the thing in the boat yet. Andrew (hull #1) had serious issues with keel vibration with his first one...it's pretty apparent in one of his videos, they call it the "wobble board." I think it was more a seating issue in the keel trunk than a strength of material issue...cant remember. thx very much for your time, Dr. --tf > Hey, Tim--I thought there was a mistake in your typing, so checked the > class > site and the rules are exactly as stated. Here's where I think there's an > error: <<maximum chord is not to be greater than 2">>. The chord is the > distance covered by any section of the keel/rudder/wing/etc. from fore to > aft (as in "Keel foil is 13.5 root chord, 12 inches tip chord). Two > inches > has to be a mistake--either they mean max keel section thickness is not to > be greater than 2", or maximum chord is not to be greater than 2 feet. > Can > you get an opinion on this? > > Also, let me know your target speeds--where you might want to find > yourself > on a beam reach, and where you might like to be at about 45 degrees off > the > wind. That's the range where the keel design will most help or hinder > you, > and I can design for those speeds in those conditions. > > One other question--are you planning to have a daggerboard-type keel or > fixed? Or, hey, canting? It's only 185 pounds max. And allowed. Don't > see anyone else doing it, though. But...
