Will you be taking advantage of the "L.O.A. shortening" that my pivoting davit provides? If not, then a conventional two arm davit might be better.
This is my setup Steve:
I have a single post (Schedule 40, stainless) that sits atop (thru-booted) the transom, and goes through the overhead to support the wind generator.
The davit itself? I found that on the side of the road. Singular, but it was stainless. You understand right? Solid bars, hefty and beautiful. So I had Kidlet stop the car and retrieved same.
It's been welded on an overlapping pipe that rotates. Cleat rotates with davit.
I will not be shortening the boat. I simply want to get Algae up out of the water so I can stop scraping barnacles.
First Problem is equipment. I've got two blocks (both doubles, one with and one without a becket) and according to an engineer friend, he suggested I needed triples in order to get enough gain to lift the dink up. I have little strength...
Before I lay out cash for them though, I want to make sure they work. Unless I spot a pair at one of the marine swaps one day. It's on my list.
Usually when underway I simply raised the bow up out of the water by a couple feet, securing it with two lines (one inside on an eye-bolt, and the other the U-bolt on the outside)
Putting it across the swim deck is easy and works perfectly EXCEPT I could not get out of the water should I fall in. And so that's o-u-t. Safety and all that...
I could using marlinespike create a rope ladder however the one on the swim deck works great with three steps in the water. I like that thing.
Your system, with that piece on the upright? That looks like something that might be workable. When the welder is next door (they are doing a major overhaul -- my boat is spotted with rust stains everywhere) I'll ask what he thinks. But not until he's further along in his project.
You're a welder. You KNOW what a pain in the transom it is when folks interrupt your work with more work for you to do! Daddy was a welder and everybody is your pal when the torches are out. Sigh.
Timing...
And too Eric suggested something out of wood might work. I'm still pondering options. Yours though, well, it's spiffy.
Congratulations on a plan well executed.