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My current drawings for a boomkin and different than stock mizzen stay arrangement.
this shows the proposed boomkin and the mizzen boom swing radius
instead of having spreaders and such a high mizzen mast I am going to split the main mast back stay, lead my uppers aft and the intermediets forward. add the boom kin. I still have yet to find the right way to create chain plates for both the main mast back stays and the aft led mizzen upper stays. the bowsprit is fantasy as of now but it looks nice. sorry I did not have time to label the drawings. I will formulate more specific questions with regard to the chainplates after lunch.
Nice drawings! It's fun to dream on paper. I like the bowsprit.
FWIW, the boomkin I've seen on another Triton yawl (Denis Batcheller's #15 Liberty) was a single piece of wood (oak?) with wire supports (stays?) going to the transom. My boat still has some of the hardware for this arrangement. You could go on the Yahoo! list and ask him for a picture if you're interested. Your solution seems much more robust. I wonder if it would be worth the trouble to make the boomkin removable for those times when you're charged by the foot.
My mizzen mast also has spreaders and a jumper strut. The 'chainplates' were bronze eyebolts, which I replaced with stainless. I also reinforced them under the deck with 3/4" marine ply, as that part of the deck is not cored. There used to be a truly awful repair to the deck where one of these eyebolts had pulled right through. It was a mound of epoxy and chopped glass with some copper wire thrown in.
FYI, here are some numbers from my boat (YMMV):
Mizzen Mast
Height - 21'
Max. Hoist - 20' 2"
From gooseneck pin to cockpit sole - 5' 7"
Jumper strut - 13"
Spreader width - 27"
Spreaders from deck -13' 4"
rigged on my Alden Challenger. The mizzen sheet goes right to the stern rail from about 2/3 out of the boom. This mizzen is 50 square feet. The staysail is 3/4 oz. nylon and a breeze to fly. Once the wind goes aft of the beam, you'll see the mizzen doused as it begins to blanket the staysail.
The staysail flies alot of sail between the main and mizzen. On this light air day in Penobscot Bay, very light westerly morning winds were on our beam. With the staysail and 135 genny, we can fly over 1000 feet of sail. We moved nicely down the bay even with me towed in the dinghy taking pictures.
