Morison-Type Aerodynamic Drag 1. Description Morison-type quadratic aerodynamic drag loads based on the relative wind velocity. Use for structural elements such as pipes and cables exposed to wind where only drag forces are relevant. This is the simplest and most commonly used aerodynamic load model for non-lifting structures. 2. Theory For details, see: Theory - Load models - Morison-type aerodynamic drag loads Aerodynamic Load Models Airfoil