How does one measure severity? This is one of the most critical issues for this study. This implies that a metric or measure is needed to enable a method of quantifying how ‘bad’ or severe a particular encounter is, or perhaps, is likely to be. A wide range of factors influence the severity of encounter from the strength of the vortex, its proximity to the ground to the intercept angle and velocity. Other factors alson eed to be consiered such as the visual conditions, the rcharacterisitics of the rotorcraft type and level of the flight control augmentation.
Flight Science Technology, School of Engineering,
University of Liverpool