keel

Hi all, I'm working on what is supposedly a little inshore Pilot cutter called Doris, built in Milford Haven in 1917. I'm not entirely sure she worked as a pilot, she has been registered in the 30s as such with lloyds but her size is quite yachty. She's not been in the water for a long time...

Why is it that all the weighted swing keels I see are never vertical when lowered? fully extended they maintain a swept-back angle of maybe 20-30 degrees. If such an angle were optimal, modern fixed keels would surely be angled back also. But they aren't. Surely, it isn't because no one can...

Hello folks, Just a simple question, I have a standard sized small rowboat and have built myself a sailing kit, with rudder, leeboards, mast and sail. Tested it today, sails like a dream, but of course, the upwind capability could be better - it slows down considerably=extremely slow. Of course...

I'm looking for simple and easily deployed keel/daggerboard concepts for a small catamaran. Is there somewhere that has a collection of people's design ideas? I want to have minimal draft for exploring extremely shallow areas in the bahamas so fixed keels are not really an option. I have...

Hi Everyone, Hoping someone can help. Dad and I Ave a Transworld 41. We have done extensive work to this boat and pulled it a few weeks ago to install a Bow Thruster and do annual bottom job. After it was out a week. Moisture appeared on bottom about 8 inches above bottom of keel. Dad sanded a...

Good day all. I'll keep this short and sweet. Looking for your aluminum yacht building expertise: I am considering the idea of casting a lead bulb, hydrodynamically fair and bolt it to an aluminum fin shaped keel. Seeking advise regarding if this concept of attaching a lead bulb to an aluminum...

We want to extract a lumpf of lead from a keel, the lead is supposed be casted with lead/antimon. I know from my active years that the chain saw is the only really option, bus this is the rough version. I imagine that today we could watercut the keel section between two keel bolts? Have youz got...

I plan to finally build Rube Allyn’s houseboat “Water Wagon”. For the last 50 years or so I have been carrying around his plans that where in Mechanix Illustrated, and two travel books he wrote, of his travels around Florida, in the late 1940s and early 1950s. I remember it being in an old...

Hi I own a A35 from 2007, and would like to re-shape the keel. For this I am looking for the section profile of the keel fin in order to make templates. thanks for any advice, kind regards Jocki

I am interested in boat building and I realize a keel is an important part if not the most important part and I'm wondering how large my keel should be on a 6 m long old wood boat. I was thinking of making the keel 12 x 8 and frames 6 x 6 but then I realized it's too large for a 6 m long boat...

Dear all, I am trying to estimate the resistance added from a bulb on a sailing yacht in upright resistance. I have bare hull resistance calculated from maxsurf resistance I have calculated appendage added resistance with the methods described in the book "Aero-Hydrodynamics and the...

The centerboard keel on my holder 20 is cased in with fiberglass. Over the years, the keel has become increasingly difficult to lower (and raise) because the sides of the cased-in keel are binding on the sides of the shaft that it slides in. I was puzzled why the problem got worse over time -...

Good evening gentlemen, I wonder if anyone could enlighten me (or point me in the right direction) on this subject. I have a self-built (not by me..) catamaran from Norway, a TC1060. I installed inboard engines with saildrives 11 years ago and even if I've avoided any accidents so far I'm...

I have been searching for more information of the effects of the trailing edge (TE) of keels and rudders in these forums and others. I have not been able to find a full picture of the problem, just minor references here and there. The best I can ascertain is that the least drag TE would be a...

I have finally purchased a trailer and have tackled the hideous job of stripping the gel coat due to the dreaded "pox". A typical problem of this era boat (1988 or so). I have discovered a rather odd shape to the trailing edge of the keel next to the hull. It is squared off and tapering down...

((New Version)) To solve some of the issues with the older version, I backed away from the keel control ...and made it simply a very generous rudder on a central ring. I also duplicated the fixed sail to allow for additional wind angles (otherwise it would have been trying to force the...

Hello, my boat is a wood 1946 downeast lobster boat. I have a CAT 3304 diesel that is currently set up for wet exhaust. She’s being converted to keel cooling. I need to know what changes I’ll need to make to the engine itself and what parts I’ll need to accomodate the keel cooler. With the keel...

Hi I'm one of those dreaming of building my own boat (or have it built for me). The dream boat shall be a long keeled ocean going yacht, roughly 12 m, built in steel or aluminum. While searching the web i stumbled across this page Type comparison...

Anyone have any information about a Simpson 8.3m sailing Catamaran . I have just purchased one, it needs two fixed keels repaired or daggerboards fitted and other minor repairs. Any info about this design would be great, I can't find a single thing on the web apart from boatcraft plans. Thanks

Hi, I am designing a sailing cum motor aluminum yacht. It is 30m long, and have 7 tons of ballast keel at around 40% midship region. My doubt it, would there be a bar keel in the remaining of the boat? Its a V hull.