hinge joint for swing

How do you make an infinite swing?

I used hinge joint for swinging an object.
It worked fine but the rigidbody gets slower and eventually stops.

Making angular drag zero didn’t work.
Is there a simple way to achieve infinite swing(by just changing values at inspector)
or do I have to write a script?

Old topic, but use motor would help i think. It is in the hinge joint settings.