Pulsar fusion is working to make a fusion propulsion system with about 10000-15000 ISP. This is about 25 to 40 times the ISP (exhaust speed and fuel efficiency) compared to chemical systems. There was ...
Winter, Frank H. 1999. "The Influence of the von Opel-Valier Experiments Upon German Rocket Propelled Model Aircraft Development, 1920's–1930's." Journal of the British Interplanetary Society, 52, (7) ...