SHOL Limit Analysis
Ship motion limits are required for the safe conduct of helicopter operations at sea, particularly prior to a FOCFT. At the evaluation stage a prediction of sea state capability as well as the potential risk are vital to ensure that adequate capability can be achieved.
Since 1997 we have determined safe operating limits for all RAN helicopters and provided procurement advice to ADF Project Offices. By working closely with the RAN and DSTO we have aquired a strong understanding of operational requirements.
Ship motion limit analysis is conducted to establish safe operating limits for helicopter operations including start up, shut down, flight deck traversing and the use of a particular lashing scheme or restraint system to secure the helicopter.
Traditional Roll vs Pitch Limits Showing Sinusoidal Derived limits, typical operational RAN limits as well as Expanded "Chamfered" Limits
Sea State Capability Plot Showing Limit Proximity as a Function of Significant Wave Height and Relative Wave Heading at a Fixed Speed
Risk Assessment Plot Showing Likely Number of Limit Occurrences per Hour as a function of Significant Wave Height and Relative Wave Heading at a Fixed Speed