How much weight can a halyard and boom hold?

[Scubaseas]

You don't want to bend the boom. The boom is used to keep the halyard where you want it. You want your loads in compression.

[Boatyarddog]

Originally Posted by Letterkenny

I mean I figured but I don’t want to hurt the boat! This thing is going to be my baby.

Have to ask... What exactly are you wanting to lift out, and to where?
Is it a straight out lift, can you stage the lift to different points.
400# should be fine, if just straight up.
also, if weight is problematic, try thinking about 2 halyards lifting, split the load, remove accessory items off the load if possible.
Support the load in other ways to facilitate the lift with the boom? A Crutch perhaps?
You might think about a purchase for the actual lift, and halyards to support the lifting point, this is safer and easier on you and can swivel somewhat, often needed to clear tight areas.

It IS your baby, don't drop it trying to grunt it out.
Any thoughts? Pictures?
That all helps, we all tend to think of our own boat in these situations.
In any case I'd love to hear what your doing here.
SV Cloud Duster

[double u]

...it might matter WHO lies in the hammock(s)...
https://worldpopulationreview.com/co...bese-countries

[moseriw]

10tons on a 500 gross tons schooner?

[peter loveridge]

the wooden boom on my boat is just short of 15' long . Mainsheet comes off about 12 ' from the mast. The main halyard is 7/16 three strand dacron. I have lifted my 300lb engine out a few times, and more than a few times loaded 8D batteries with the main halyard attached to the end of the boom and the 4 part mainsheet doing the lift. The boom bent a little , but solid wooden spars are pretty tolerant of bending. I don't think you will have any problem

[gonesail]

Originally Posted by Reefmagnet

Halyard and boom is quite commonly used to lift engines in and out of cabins so done right they can bear weight. The trick with the boom is to rig it so any load places it into compression.

the guy (and his helper) behind me lifted out a 400 lb. westerbeke using the boom of his Sabre 34. I was amazed at how fast they did it. Set it on a dolly and rolled it down the dock. as you said.. support the boom at the lift point.

[Scorpius]

Originally Posted by Letterkenny

Brand new Jeanneau 349 so not sure what size the rigging but everything new so no concern for wear. The hoisted object now, well that’s simply a hammock for 2 (and maybe a couple kids). Would like to hang on the bow or hanging with the boom over the water and hammock hanging from there.

For that use it should, unfortunately, be no problem. Otherwise a great dunk tank experience for all involved!

[Boatyarddog]

Originally Posted by Scorpius

For that use it should, unfortunately, be no problem. Otherwise a great dunk tank experience for all involved!

Dang Mechanics brain of mine.
Your just gonna have fun, not lift an engine.
A halyard will hold you fine.
Enjoy....
SV Cloud Duster

[chasfgr]

Don't work in lbs, but on mine I've lifted a Yanmar engine - about 140kg.


It does depend on how yout're lifting it, Mine was from alongside the boat to into the engine compartment - 12mm spectra halyard to the end of 3.3m boom 90mm deep.
I wouldn't dream of trying to lift any weight on the topping lift - the cheek block it goes to is fixed by two 8mm self-tappers through the side of the mast.
I use the #2 foresail halyard to lift the dinghy and OB.
As alreay suggested the limiting factor appears how much your winches will comfortably handle.

[AndyEss]

Try to have the boom cocked at an angle roughly bisecting the halyard and the drop line to your hammock. This will help keep the boom in pure compression.
As others have suggested, attach the halyard directly above the hammock drop line to minimize any cantilever load on the boom

[wet dreamer]

That's An Interesting Question............How Long Is A String?

[LittleWing77]

Originally Posted by Letterkenny

Brand new Jeanneau 349, so not sure what size the rigging, but everything new - so no concern for wear.

The hoisted object, now, well that’s simply a hammock for 2 (and maybe a couple kids).

Would like to hang on the bow or hanging with the boom over the water and hammock hanging from there.

Although there are a number of perfectly acceptable how-to-do-it responses and load calculations above, Letterkenny, you'll probably be using the hammock at anchor, yes?

Remember, one of the techniques for heeling a boat over to free a keel that is aground is by putting weight on the boom and swinging it out over the water.

It may perhaps not be as pronounced in these beamier downwind-sled types of hull designs, but unless everyone relaxing in the cockpit would like to be sitting at-angle and/or spilling their drinks, I wouldn't choose to deliberately swing out the boom with any weight on it...

Just string up your hammock in the bow foretriangle using the spin halyard.

Fair winds,
LittleWing77

[Mauruuru]

400 lbs shouldn’t be a problem. I recently removed Yanmar 3YM30 by chain hoist attached to my boom with main halyard attached and tensioned at the same point
This essentially put most of the load on the halyard sheeve at the top of the mast.
Handled without any issues

[smacksman]

Usually the line is the strongest point. The weakest point is often the block or shackle.

[Mauruuru]

exactly the point