lifting the engine using the boom?

[Mrnotming]

Boom as crane

Scotty Twister rightly raises the issues of toppling forces when the boom is swung out with the engine suspended for lowering to the ground. Assuming a fin keeler, I blocked off the keel to the cradle both sides at ground level with stout timbers. Also props fore and aft near extremities of hull.I may have done this anyway as we get nasty north -easters in wintertime (mostly) which will move yachts on cradles.All good advice esp about avoiding boom bend at all costs.Good luck with engine in/out.

 

[oldharry]

Hiab, local farmer with a front lift on his tractor? I would be concerned about point loading using the boom, though i have lifted small engines this way.

How about hiring a scaffold tower,and using a chain hoist to lif the engines to cockpit level. Make sure the gel coat is well protected with e.g planks or gash plywood sheeting wherever the engine is if doing it by hand. One slip can make a really nasty gash in the gelcoat.

 

[Searush]

Hiab, local farmer with a front lift on his tractor? I would be concerned about point loading using the boom, though i have lifted small engines this way.

How about hiring a scaffold tower,and using a chain hoist to lif the engines to cockpit level. Make sure the gel coat is well protected with e.g planks or gash plywood sheeting wherever the engine is if doing it by hand. One slip can make a really nasty gash in the gelcoat.

What made you dig this up, Harry? See my post on P1, I lifted my MD2b in & out several times using the boom & those are bloody heavy when you leave the flywheel & gearbox on like I did.

 

[Scotty_Tradewind]

Hiab, local farmer with a front lift on his tractor? I would be concerned about point loading using the boom, though i have lifted small engines this way.

How about hiring a scaffold tower,and using a chain hoist to lif the engines to cockpit level. Make sure the gel coat is well protected with e.g planks or gash plywood sheeting wherever the engine is if doing it by hand. One slip can make a really nasty gash in the gelcoat.

Thread revival...Blimey harry..... did you get bored or something? You should get out more!

having said that I had a guy in the yard lift my engine out with a fork lift when my last boat needed a heart transplant.

S.

 

[jdc]

Unless you have a dinghy, the load induced by sails on a breezy day far exceeds the weight of an engine.

- The working load of the smallest Barton block, which is probably about the same as a sheeve, is 1260 kg, ie about 10x the weight of an engine (ok, the line is doubled, so that's 'only' a 5x safety margin, not 10x)

- When I hoist my main I pull much harder than I do when hoisting someone aloft, maybe 2x, so again that's heavier than the engine. And this is before I sheet in

- To drive my boat forward through the water at 8 knots in still water takes more than 4kN, ie more than 400kg. At 10 knots it's over 1 tonne. I frequently go faster than 8 knots for days on end

- The slab reefing lines get cranked on really hard, and then one sheets in hard when on the wind in a near gale - perhaps also 200kg +

- The breaking strain of the halyard (and topping lift) is 4400 kg (more than 4 tonnes).

So don't bend the boom, but otherwise don't worry. 130 kg is nothing.

 

[oldharry]

What made you dig this up, Harry? See my post on P1, I lifted my MD2b in & out several times using the boom & those are bloody heavy when you leave the flywheel & gearbox on like I did.

Oops! Responding to yachtailsa's thread lifting the engine, and followed Kelpies link to this one......

 

[KellysEye]

Our MD17C was lifted out and put back with the main boom and that is heavy.

 

[theoldsalt]

http://www.youtube.com/watch?v=-YmtKKGj0eI
https://www.youtube.com/watch?v=-AXTirTQ5d8
http://www.youtube.com/watch?v=Qvy5p-T1bEg

 

[Scotty_Tradewind]

If anyone is struggling and was thinking that to support the boom that may like to borrow an 'A' frame,
drop me a PM. ,I can measure to see if appropriate. I have two that are blocking the side drive and Mrs S would be pleased to see them go for a while

I'm in S. Oxfordshire yet go down to Portsmouth/Wicormarine regularly.

S.

 

[VO5]

Our MD17C was lifted out and put back with the main boom and that is heavy.

I agree it is heavy...230 Kg !
Your topping lift must be hefty is all I can say.

 

[Mudisox]

Just done two engines so 4 moves/ times , swinging the boom over the side and then on to the trolley on the pontoon. Take what you can off first [alternator weighs a lot] and also don't protect the boat and its furniture, wrap the engine in plenty of cushioning,[I used "moving" blankets] Also I did it in 5 small moves through various hatches up to the boom, with the main halyard also supporting the point of lift on the boom. Mainsheet and various handy billies, that's what they are for.
Hornblower lifted bloidy great cannons using the same system.

 

[Poignard]

It's worth examining your boom carefully before you hang an engine off it. My boom unexpectedly broke in two one day whilst sailing. It had unseen (by me and a surveyor) corrosion under the s/s kicker attachment plate.