It might help to tell us the scale you are working to, as well as showing a picture of the type of crane you want to use.

It should not be too difficult to mount any crane on a rotating base, and connect that direct to a servo. You should be able to run the crane line under the crane as well, and connect that to a motor. You would then also need:

– At least one 'servo slowing' device – **LINK** to make the crane slew at the proper speed

– a geared slow motor for the line – **LINK**

– an R/C switch to operate the crane line – **LINK**

These are the cheapest I could easily find on the net. I have provided them as examples – you may well wish to get better items at a higher price…

There are some crane sets here, with a 'function set' for adding radio control to a crane at the bottom of the page. You can download the instructions.

**LINK**

I would be inclined to go with the Robbe kit here, and scratch-build my own controls…

**LINK**