Introducing Inertia with Rigid Groups

Hi,

I am trying to run a dynamic impact analysis problem with bouncing involved. In my model, I have added inertia specified in global skew frame to replicate the actual case. I want to reduce the computation time when the body is off the ground by introducing a rigid group consisting of all the nodes in the model. For the same, I am using a sensor of TYPE: interface. According to the RBODY definition, is SENS_ID is non-zero, the added inertia is ignored. Please confirm if this is true? If so, how do I ensure that the added inertia is incorporated in the model when I make SENS_ID non-zero.

Thanks and Regards,

Sai Phanindra