Medium duty Jib crane

[wizard69]

The base for a Jib Crane can be non trivial. Gorbel (www.gorbel.com) for example has suggestions for concrete bases for jib cranes in their manuals and you are talking about pads that can be 4 to 5 feet thick and as much as 10feet wide for a large crane. Needless to say that is a big concrete pour projects.

Given that you may want to consider alternative crane systems for a boat rebuild project. One approach that can sometimes be more economical is a bridge crane. The nice thing with these sorts of cranes is that they often can be installed with little additional foundational work. Also you can be assured full coverage of whatever you are working on. A jib crane almost never covers all of a vehicle such as a boat.

I only mention bridge cranes due to the adoption of them at work over alternatives. They can be fairly cheap to install and operate compared to the need to cut a big hole in your concrete floor for a massive foundation.

I have been planning to build small crane to our yard.
Its just that it needs heavy base or counter weight...

I bought a steel boat to be restored.
Crane would be handy when lifting steel plates.

Your post made me think.

Could it be useful feature if you could adjust the height of the cross beam?

If you don't need to lift high, then beam could be lowered.
Then it doesn't need so heavy base. When cross beam is lifted up, you could lift higher, but only lighter objects.

And...
I just don't find right words in english.

I think you did fine.

Maybe i need to draw a picture...