mast and boom capacity

Issues related to boat specifications or performance

mast and boom capacity

Postby bud fernandes » Sat Oct 20, 2018 10:00 am

High folks,
New to forum and to trawlers but not to occean. My wife and I bought a 1980 49 Grand Banks this summer and we are slowly getting the systems up to par. The mast and boom are in great shape and I was trying to figure out structurely including stay wire system what the safe lifting capacity is. All the rigging is new and rated to 1200lbs working load. The stay wires are 3/8 stainless in great shape also.

Thanks,
Bud
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Re: mast and boom capacity

Postby Cilibraise » Sun Oct 21, 2018 10:34 am

I have a '85 GB49, I can safely lift my 250lb tender. The anchor points on the cabinet/flybridge may the weakest points in the system. You would have to check the integrity of the backing plates and the fiberglass around the anchor points. The equivalent length of the lever arms for the anchor point is much shorter than the boom length, thus will multiple the load onto the anchor points by a factor of 3 or 4.
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Re: mast and boom capacity

Postby Aitchy » Thu Jan 31, 2019 3:53 am

Hi there, I'm really new to this forum and am delighted to have recently acquired a 1976 42 Classic. I'm having her shipped from Australia to New Zealand. I think there are probably only a handful of GB 42's down here and I'm wrapt to have purchased such an iconic vessel.
I really want a decent tender to sit on the bridge deck and the one I'm considering is a 3m Brig with a 20hp 4 stroke Mercury.
Weight is around 150kgs wet. Question, will the (wooden) mast/boom cope with the weight?
Help!!
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