Helicopter Takeoff and Landing Procedures in Adverse Conditions using Inverse Simulation. Progress note: Oct. 92 - Sept. 93. Internal report no. 9332

This report summarises the progress made in the second year of a study of helicopter offshore operations in adverse conditions. Initially, a narrative description of key helicopter heli-deck related manoeuvres in the presence and absence of engine failures, is given. Based on this information, mathematical models of the manoeuvres are developed in a form suitable for use as input to inverse simulation. The demands of simulating pilot strategies in the event of engine failures has necessitated the development of a multistage inverse-forward-inverse simulation technique of novel kind and a comprehensive description of this method is presented. A dynamic graphics package has been created to demonstrate piloting strategies and its formulation is briefly outlined. The piloting strategies as derived from simulation studies are presented for the Towering Takeoff and Normal Approach and Landing manoeuvres (with and without engine failures) and these are qualitatively validated against descriptions provided by practicing pilots. Finally, some conclusions are drawn and directions for future work highlighted