Boeing: Rocketdyne: XRS-2200 Linear Aerospike Engine

Boeing: Rocketdyne: XRS-2200 Linear Aerospike Engine: "The XRS-2200 Linear Aerospike Engine is being produced for use on the Lockheed Martin Skunk Works' X-33 Vehicle. The Aerospike allows development of the most traceable X-33. Flight operation, flight control, and installed engine performance are fully representative of the Reusable Launch Vehicle. The engine structure is integral to the vehicle, demonstrating installed weight benefits. Over $500 million have been invested to date in aerospike engines, and previous full-size versions of the engines have accumulated 73 tests and over 4,000 seconds of operation."