Tony,
Yer right. That davit thingy is a bit of extra gear and weight.
A gun tackle on the boom would be cool IF the boom end was above the OB well,
which it certainly isn't.
Once came upon a blog where the guy had actually made an extension for his boom for the purpose of raising his OB.
There are other possibilities. For instance if a boom gallows* is fitted a leg might support a davit arm and gun tackle. Your ab normal geezer isn't going to be able to haul a 110# Yamaha outta the hole. To dismount the behemoth it will have to be lifted with one hand on the tackle, the propeller and fin carefully slewed and guided with the other hand around stuff, and swung over the toerail onto the dock or even into a dinghy. Who knows, but more controlled the better.
Also a davit might be useful for other weighty issues that have to be eased aboard.
Jerry cans or a sodden crew!!!
Really need a kicker half the weight.
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*Can see a boom gallows substituting for the stern pulpit on litlgull, leaving the stern without tubing.
It also would make an important high safety bar in the rear of the cockpit
where imco something strong to hold on to while standing is really a plus.
It also can make it convenient to attach various canopies and privacy enclosures for the cockpit.
The gallow's legs would make it possible to finesse an overweight OB over either side of the Ariel.
Whether a boom gallows is needed if a rigid vang is on the boom is questionable.
Maybe this needs another thread???