Chemical Propulsion Information Agency Comprehensive site with technical resources, propulsion papers, meetings and events calendar. http://www.cpia.jhu.edu/
Compreactive Propeller (Airscrew). It is suggested to use the internal space (internal channel) of a rotating blade as a centrifugal flow pump delivering pressurized air in a jet engine located on the blade tip. http://shulga.tripod.com/compreactive/E.htm