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I will focus on a strap through the front crossbeam (stays in place at all times) and 2 removable straps that wrap around the rear crossbeam and hook to either end of the strap through the front crossbeam.
Back at the boat for a little more exploration and measuring this afternoon. I am drifting back toward my idea of 1/4" stainless cable with a strong UV-resistant coating.
The crossbeam endcaps on both front and rear have approx 1/2" openings with nice radiused transitions. The idea is to run the cable through the existing holes and swage a thimble on each end. A 4 strap lifting rig will attach to each thimble with hooks. The cable will exert pressure on the extruded end cap that will transfer the load to the upper half (I guess?) of the crossbeam extrusion.
Concerns
- What to do with the thimbles that are sticking out when not being lifted?
- The hook/thimble joint may rub on the Cat Cabin.
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Unlike most cats the 21SC has a front crossbar to support the front tramp. I would lift the bows from straps on this crossbar....
I would certainly prefer this! 4 choker straps with a common lifting ring and I am golden.
My concern is the front tramp crossbar is only attached with a small plate and 2 bolts on either side. This looks appropriate to take the load of the tramp as it is transferred down through the plate and onto the top of the hull. My impression is that these 4 bolts (2 on each side) would take at least half the weight of the boat when lifting. This force would be pulling up, like a claw hammer removing a nail, and is a lot to ask for anything threaded into fiberglass.
Page 10 of the parts guide appears to show machine-style screws for the mounting plate which leads me to speculate that a nut or threaded bar is integrated into the hulls somehow. Unless I have missed it, neither the assembly guide nor the parts guide details this section of the hull.
Does anyone know what is inside the hulls? If the hull has something approximating a chainplate or significant backing plate I would love to know.
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Alternatively just trailer it down the ramps.
The boat will be stored mast-up with most rigging during the summer months. I have a fantasy of being able to jump on my bike with the kids, ride the club, be sailing in 20 min! The crane and lifting rig makes this possible.
Thanks again for all the thoughts!