Instantiate, HingeJoint physics wrong

Hey,

I got a player that is completely physic based. You can add forces and control the player that way. To make it a little easier I want to show how the player would behave.

That task is actually very simple. I set my player to kinematic = true and Instantiate it again. That way I achieve a copy. I set up another layer for the copy to avoid collisions.

Now I set the kinematic of that copy to false.

I think the velocity and all that stuff is not copied. Thats why I loop all objects and I set up the velocity, angularVelocity, mass, rotation and that stuff.

Furtheremore I'm using HingeJoints, thats why I overwrite anchor, connectedAnchor and that stuff, too.

I run that project and it looks alright but the physic is off sometimes. If I apply torque to the joints it gets even worse.

I really don't understand. I suppose that I need to overwrite the velocity of the HingeJoint, too. But I cannot access it because it is read-only.

Is there an alternative to Instantiate that does a real copy? How can I solve the problem?

I'm really running out of ideas...

Thank you