Controls concepts for next generation reusable rocket engines

Three primary issues will drive the design and control used in next generation reusable rocket engines. In addition to steady-state and dynamic performance, the requirements for increased durability, reliability and operability (with faults) will dictate which new controls and design technologies and features will be brought to bear. An array of concepts which have been brought forward will be tested against the measures of cost and benefit as reflected in the above "ilities". This paper examines some of the new concepts and looks for metrics to judge their value.