| Description | Type | Default |
|---|---|---|
| Specifies how the WTMASS model parameter is used to determine gravity loads. The NORAN option (default) uses WTMASS to convert GRAV loads into units of gravity. The NASTRAN option does not use WTMASS and thus requires models in mass density units to specify gravity loads in weight units versus G's which is consistent with other versions of Nastran. | NASTRAN/NORAN | NASTRAN |