Rigidbody should only torque around selected axis

Hi All,

Tuning the turning radius of a ship. It flops over and pitches in the first 90 degrees of course change? It slowly rotates around local Z and X axis too. I only want the y axis.

I apply forward force in Z direction. I torque around the Y axis.

gravity is off

capsule collider in the Z direction.

mass = 500

cg = ( 0.0, 0.0, 0.0 )

Relevant code:

             // the force is relative to the rb local corrdinate system
             bodyToPush.AddRelativeForce( 0.0f, // x : float, 
                                      0.0f, // y : float, 
                                      force, // z : float, 
                                      ForceMode.Force ); // mode : ForceMode = ForceMode.Force) : void     
 

 
     protected virtual void applyTorque( float torque ) {
         //print ( "torque: " + torque );
         Rigidbody parentRB = connectedRigidbody.rigidbody;
         parentRB.AddRelativeTorque( new Vector3( 0.0f, torque, 0.0f ) );                
     }
 
 

Cheers, Kevin