rotate a transform relative to parent rigidbody speed vector

Questions & Answers
1

Hi there !
I wanted my child sprite to rotate relative to the parent rigidbody movement.

I suppose that I need to get my velocity vector and modify the rotation of the child accordingly, but does anybody know the proper way to write it down ?

Thanx all !

2

I just realized 2D joints should do exactly what i want…
Just to clarify : i wanted a flying guy with a kind of trailing cape, with proper pivot points, joints should do the job, right ?