Mast step Californian 42 LRC
- Thread starter boomsurf
- Start date
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If you have answers, please help by responding to the unanswered posts.
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Portage_Bay
Guru
- Joined
- Oct 19, 2015
- Messages
- 2,457
- Location
- United States
- Vessel Name
- Pacific Myst
- Vessel Make
- West Bay 4500
I'll be at the boat tomorrow and can take pics. Not sure if my mast and tabernacle are original. I have the owner's manual that came with the boat. I don't recall seeing anything about the mast but I'll take a p99k.
Portage_Bay
Guru
- Joined
- Oct 19, 2015
- Messages
- 2,457
- Location
- United States
- Vessel Name
- Pacific Myst
- Vessel Make
- West Bay 4500
Pics of my '83 Californian 42 LRC mast.
If you have one or are having one built and you want to lift more than 300 lbs I advise you to get a naval engineer to calculate safe working loads. I think the vertical component of the load is pretty good because the tabernacle base is almost on top of the bulkhead separating the aft cabin from the saloon. All of that will be in compression and quite strong. The problem comes when lifting something from over the side with the boom. You will be relying upon the relatively weak stays and mast mount + receiver. Their weak point is they are surface mounted with screws to aging fiberglass covered plywood. Not through bolted with backing plates.
Though it has nothing to do with the mast and boom on a 42 LRC this little story will serve to illustrate the change in working load with boom position. A boat I used to run had a hella stout crane. With the boom vertical the safe working load was 11,000 lbs. Boom at 45 degress 2,500 lbs. Boom horizontal 1,600 lbs. Boom below horizontal 800 lbs.
- Tabernacle shows the hinged mast "step". It is located on the aft cabin top immediately aft of the aft saloon windows.
- Mast mount shows a pair of angles, one aluminum and welded to the aluminum mast. The other stainless and bolted to the aluminum angle. The bolts with wing nuts go into the receiver.
- Receiver. Accepts the bolts with wing nuts. It is mounted on the saloon cabin top.
- Stay attachment point. There are 3. One each port and starboard about 31" from the mast. One forward close to the fly bridge seating about 5 ft from the mast.
If you have one or are having one built and you want to lift more than 300 lbs I advise you to get a naval engineer to calculate safe working loads. I think the vertical component of the load is pretty good because the tabernacle base is almost on top of the bulkhead separating the aft cabin from the saloon. All of that will be in compression and quite strong. The problem comes when lifting something from over the side with the boom. You will be relying upon the relatively weak stays and mast mount + receiver. Their weak point is they are surface mounted with screws to aging fiberglass covered plywood. Not through bolted with backing plates.
Though it has nothing to do with the mast and boom on a 42 LRC this little story will serve to illustrate the change in working load with boom position. A boat I used to run had a hella stout crane. With the boom vertical the safe working load was 11,000 lbs. Boom at 45 degress 2,500 lbs. Boom horizontal 1,600 lbs. Boom below horizontal 800 lbs.
