It has taken a while but now that the frames are glassed ready for installation in the hull I am satisfied with the result.
Keel frame top webs with 2mm of epoxy glass covering.
The photo shows the frames with the doubling blocks which compensate for wood lost to the keel bolts already bonded to the laminated beams and covered with 2 mm of epoxy glass laminate. The glass content is 2000 grams per m2 and will add strength as well as protecting the timber. Across the keel the section is 110 mm wide because I have made wider frames and increased the thickness of the doubling blocks to allow for 25mm keel bolts. It is a lot of work and not required for the standard design but then I do like strong yachts.
Readers of my Passion blog will know that I put three extra 80 mm wide by 160 mm deep keel floors and two extra keel bolts in my Jeanneau SO 37 to ensure a long trouble free life.
I should stop referring to the laminated floors as keel frames because they are just the top web of a compound beam made up of the laminated floors, the spacers between the frames and the hull and the plywood cover on the outside of the hull. It is like an I beam with the hull side section a piece of plywood equal in width to the frame spacing. In my case I am adding all that glass to the top web and will be adding glass to the outside of the plywood where it will give the most contribution to structural strength. There will be glass in the bilge to hold everything together and keep out the water but I have not included that in my considerations of the strength of the frames.