Hypersonic Waveriders: Hypersonic flow theory and applications to waveriders and other hypersonic flight vehicles.LiftPort - The Space Elevator Company: Offering information and project documents by a company aiming to construct space elevators.Nasa X-Planes: Provides a centralized location for information on NASA X-aircraft. Also provides links to photos, fact sheets, line drawings and movie clips.Rotational Slingshot Catapult: Provides a space enthusiast's view of the possibility to use alternative means for propulsion of spacecraft.Sky Ramp Technology: Information on sky ramp technology and its applications.Space Launcher: Pylon Turn Wing Concept: An hypothetical alternative space launch system.StarClimber Space Elevator Team: Official web site of the StarClimber Team, developing a space elevator prototype for entry in NASA/Spaceward.org's Climber Competition.