I will be adding some 8"x8"x 10' hemlock beams around my existing crib dock
(current dimensions are 8' wide x 8' deep x 6' high) before attaching the gangway
and floating docks. I would like bolt into position, a steel
, or aluminum
pipe, that will be high enough, and strong enough to step and unstep the mast
on my 30' sailboat. I can easily notch out the existing crib beams and the new ones, to allow something like a 4" or 5" pipe to be sandwiched in between, and therefore fixed to the crib. I would also bolt it to the beams, etc.
likely weighs 150 - 200 lbs (30 year old boat with heavy single
spreader rig) and is about 34' long, and the deck
could be floating about even with the top of the crib, at low tide.
However, the mast step would be about 15 - 20' out from the crib, as it rests in the water
, on the flating dock
Or, at High tide, I could likely bring it in closer to the crib, perhaps temporarily tied inside the floating dock, adjacent the gangway
I have seen some small marinas
where their mast crane is a fairly tall, heavy pipe, with a block and tackle attached to the top, and a rope
runs from it to the top of a secondary pipe, which is attached 10 or more ft up the main pipe. This secondary "arm" pipe does the lifting, and is supported by the main pipe.
I would think that the system would have to be about 20' high to be able to lift
the mast from above it's halfway point, and be able to swing, or reach out to position the mast for stepping / unstepping each season.
If anyone would care to provide some advice on what size or design of system would be best for this application, I would appreciate it.
If necessary, I could run supporting lines from the top of the pipe / crane, to the base or midway point of a couple of large pine trees which sit 50' back from the crib dock.
I do not need to rig up the whole system now, but want to put an adequately sized pipe in the crib, to be used this fall to unstep!
I am thinking of something like this ship /barge derreck image:
Thanks in advance for all responses!