Advice For Lifting A Sailing Yacht With a Crane

[ghostlymoron]

A 25T crane will lift 25T at 1m radius but only 1T at 25m radius.

 

[prv]

If you dont have a spreader there is a crushing force. Use long chains and this is reduced, but there is still a crushing force.
So use spreaders.

Depends on the boat. Our previous one was built like a brick outhouse and quite happy being lifted by a HIAB with no spreaders. A bad hull shape for strops slipping off the ends, though, so they were firmly secured to the winches and the mast tabernacle.

The new boat is more lightly built, and I'd want spreaders used there.

Pete

 

[Bilgediver]

We use Forsyth of Denny and they bring brothers and slings!!!!

 

[chewi]

Depends on the boat. Our previous one was built like a brick outhouse and quite happy being lifted by a HIAB with no spreaders. A bad hull shape for strops slipping off the ends, though, so they were firmly secured to the winches and the mast tabernacle.

The new boat is more lightly built, and I'd want spreaders used there.

Pete

On quest tv a while back there was a feature about a heavy craning specialist that took all the deck gear off HMS victory while restoring her. On camera they lifted the rowing boats with very long slings but no spreaders, and the crushing load still broke the first boat. They were not boat specialists, so took no heed of the fact that an open boat had no means to resist the compression. They had to summon a chippy to fit a temp timber beam to the next boat.
Not impressive.

You can get away without spreaders, but only because the boat might be strong enough.

 

[Deleted member 36384]

…….. lifted the rowing boats with very long slings but no sopreaders, and the crushing load still broke the first boat.….. You can get away without spreaders, but only because the boat might be strong enough.

I was at Felixstowe to collect a motor boat for delivery to Peter Head that had been shipped from America. When they lifted it off the ship, using spreader bars, they still crushed the hull. The spreaders bars were too short, they picked up a convenient set instead of locating the correct set. Liability was accepted by the port authority and they repaired the boat.

 

[prv]

On quest tv a while back there was a feature about a heavy craning specialist that took all the deck gear off HMS victory while restoring her. On camera they lifted the rowing boats with very long slings but no spreaders, and the crushing load still broke the first boat.

I watched that!

As they were putting the slings on the boat, I actually muttered out loud "think you want some spreaders there, mate". Felt rather smug when they showed it had broken!

Pete