SW 26
Gallery of Seawolf 26 Pictures
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Manrique's bilge keels - the preferred keel configuration of the designer David Feltham

Jasmine's fin keel, in profile, like the bilge keel, is cast iron. Interestingly David Feltham says that he didn't actually design the keels, but it was done by a colleage

Jasmine's fin keel, leading edge. Seawolf fin keels have a very fine leading edge
 
Woolfee's keel, trailing edge. Note almost as thick as the leading edge

Rosa came with a very non-standard keel. Unfortunately I assumed it was designed by a Naval Architect and was a standard SW keel. It did go as badly as it looks, but the hole was the easiest thing to sort out. Aparently it had a wing keel that was sawn off, and was meant to be like the Warwick Collins tandem keel. It was much thicker than normal keels, and was 1 ft shorter.
 
My replacement keel for Rosa. Profile identical (as I could get) to the standard fin keel, airofoil fuller in the leading edge. Weight a touch heavier (about 30 kg). There is no standard keels still in stock, so I had to make the pattern for casting. Cast in SG Iron, a slightly more workable cast iron. Covered in 6 coats of Epoxy paint, then a "tie coat" and finally antifouling

Woolfee has 8 * 1" high tensile steel keel bolts (1 front and back, + 3 pairs), covered in car underbody paint to stop corroding. Because the keel is recessed into the housing seen here, the bolts tend not to stand in water, which helps. David Fetham now recommends either using High Tensile Steel, as seen above, or marine grade Stainless Steel, as on rosa opposite.
 
Rosa has 10 off M24 Stainless Steel keel bolts. Amble Boat Yard, who fitted the keel, secured them so tight that I could never remove them without specialist tools. They used a 5:1 multiplier on their large socket set. The surveyor overseeing the process suggested I coated the bilges with a coat of waxed gel (one that goes off without needing to be covered to keep the air off), so that cleaning bilges would be easy.

Sooper Trooper's keel, showing slight variation at the bottom