A transmission system for use with a microturbine engine that includes an input shaft operably coupled to the output shaft of the microturbine engine. The output shaft of the microturbine engine and the input shaft of the transmission system operate at a rotational speed in a range between 50,000 and...http://www.google.com.au/patents/US7575192?utm_source=gb-gplus-sharePatent US7575192 - Transmission system for use in microturbine-powered applications