Aerojet is developing a new 4N (1-lbf) thrust class hydrazine monopropellant engine to improve upon its heritage design. The new engine, called the MR-111G, has been designed to improve the manufacturability and reliability of the heritage MR-111 design which was qualified 32 years ago. In an Aerojet funded research and development program a pathfinder MR-111G engine was built and subjected to an extensive life test which included qualification vibration, cold starts, and throughput and pulse counts meeting those of the original qualification (260,000 N-s and 420,000 pulses). Throughout hot fire testing the MR-111G performed as well or better than prior MR-111 life test units. Upon completion of the testing the engine was subjected to a high resolution CT scan and was disassembled and inspected. The results of these tests show that the REA completed the program with significant margin on life. This paper will provide a general overview of the MR-111 G design, summarize the conducted test plan, and show how the MR-111G performance compares with the performance of the heritage MR-111 over life.
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