Originally Posted by marcail
Still learning how to post photos, Dimensions. Boom length 10 1. Diameter closest to mast. 6 1/2. Our end diameter. 8 1/2 . Lifting tackle. 39 from outside end. All measurement were made with steel measure and an amateur engineer in the rain.
Best of luck. I think this the original gear.
I replaced my mast and boom, as those originally equipping my boat were totally inadequate, couldn't lift a Sabot (52#) from the water beside the boat.
The boom diameter is relatively unimportant, as diameter will vary depending on the material you decide to use. in the above quote, I think his measurements are just wrong, as in the picture, it looks like my 2.5" diameter aluminum pipe. The length should be long enough to reach the centre of whatever load you are designing it to lift. In my case, I wanted to lift a Laser dinghy, 3.5' wide at max beam, so the boom needed to be 1/2 the width of my boat at the mast position plus 1/2 the width of the Laser, plus enough to avoid too much banging against the varnished rails on the way up. My boat has max beam of 14'6", so 7'3" plus 21" or 112" works as a minimum. If I was going to lift wider loads I would go with a longer boom.
Lifting tackle should be out at the very end, top and bottom.
Multiple blocks make lifting easier.