I've often thought something similar could be built for the solar arch that so many boats have on the back end. It just has to bear the weight of the solar panels (could use light weight ones) and maybe an AIS antenna.I think a 10' dinghy is too small to install davits but that's just me.
More seriously it's not trivial to design these. You can use the same dimensions as stainless steel tube davits (slightly more wall thickness for robustness) except for the deck connections where metal ones will have a bolted plate or similar. That might not be the best for a composite tube connection. Instead embedding them against the transom and glassing them to the inside of the transom (foam gussett if needed)
Do not weld the junctions. That will fail. Instead you can mitre one tube and use a thickened epoxy fillet on the inside of the join. Then wrap the joint in narrow strips of pre-wetted out unidirectional. Compact with heat shrink tape or electrical tape wrapped inside out (over peel ply). The joints will be strong but a bit bulging.
Hard to advise you further - I assume you're not an engineer and are just looking for rules of thumb.
Yup. See my solar arch on my catamaran. Made from CF/glass windsurfer masts. And a fiberglass ladder which was surprisingly useful for attaching solar panels to and running wiring. The uprights were glassed into the inside of the hulls, extending inward about 6" below deck level. Used windsurfer masts were quite cheap; about $35-50 each (that's 3 masts in the photo I think). The ladder was about $225 a decade or so ago. Then a few bucks more for CF uni to tape the joints...I've often thought something similar could be built for the solar arch that so many boats have on the back end. It just has to bear the weight of the solar panels (could use light weight ones) and maybe an AIS antenna.
Could save a lot of weight, & even make it removable for when not cruising.
Wow, those look sweet!If your own freestyling leads to somewhat different results than Hans’ work above too I can happily recommend these guys ijn Fréjus: