How to simulate a real like sky diving physics in unity 5.3?

I am trying to make sky diving game in which i need to simulate the player diving from the mountain cliff or an airplane. I have tried applying different forces such as drag, lift, gravity etc but the player motion feels very sticky and unrealistic. I have used the rigidbody addforce and addforceat methods, and accounting for the input from Input.acceleration.x/y and rotating the player accordingly. How can I go about it?