Aerospace

Beginner's Guide to Propulsion - Tutorial slides on basic propulsion concepts.
www.grc.nasa.gov/WWW/K-12/airplane/bgp.html

Chemical Propulsion Information Agency - Comprehensive site with technical resources, propulsion papers, meetings and events calendar.
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.
shulga.tripod.com/compreactive/E.htm

A & E Engineering - Some advanced propulsion concepts described.
www.up-ship.com/AandE/AandE.htm

Journal of Propulsion and Power - Searchable table of contents and information for authors and subscribers.
www.aiaa.org/content.cfm?pageid=177

Rocket Science Institute - Offers texts about rocket propulsion and propellants, from black powder pyrotechnics to NASA-scale systems.
rocketsciencebooks.home.att.net/catalog.html