Drag, Acceleration and Rope

Hi everybody

I found very usefull Dragdrop with acceleration Tutorials and Examples and for attaching like a Line or something between two objects. When you drag an object from another, the Line is getting longer and is still attached to the first object. However, I got this working, and all I have you can see at my picture.

The Game is easy, like you have a waterballon attached to a rope and with dragging you can throw it, moving like a circle (or ellipse at point of view), the rope should be attached to the top. The Problem is, that the Tutorials are showing the way for acceleration and stopping it after some.. time. I got this working that's not stopping anymore, but it's not moving like a circle still attached to the rope at one side. It just flies 'forever' until Frame End.

And here my question now: I found the physics Rope. Is it possible (or easier) to attach the waterballon to the ropes end? Or should I only set a max size for the red-white rope I just have? How is it possible then to make it move cirular/eclipse-like?

I hope I described this as good as possible... take a view to my picture.
(Top of the picture: by starting game, down of the picture: when I drag the ballon)