NASA News Release 00-052
March 10, 2000
XRS-2200 Linear Aerospike Engine Test
The 10th of 14 planned single-engine tests of the linear aerospike engine for
the X-33 Advanced Technology Demonstrator was conducted at the Stennis Space Center
in Bay St. Louis, MS, March 9, 2000.
The test ran approximately 75 of a planned 220 seconds. Early shutdown was attributed
to a change in the engine's controlling software. Initial inspections have revealed
no significant damage to the engine or supporting equipment, and the next test is
slated in about a week.
Shut-down of the engine, at 75.44 seconds, was attributed to missing a qualification
limit on fuel pump discharge pressure in new mixture ratio control software during
the first attempt at a 30% per second throttling rate from 100% to 72% power level.
All previous nine tests have gone full duration.
Objectives planned for the first 75 seconds of the test were all met including
throttle rate, thrust vector control, power level and mixture ratio. The next test
will repeat parts of this test to pick up the remaining objectives.
The XRS-2200 engine was developed and assembled by Boeing Rocketdyne Propulsion
& Power, Canoga Park, Calif. The engine will power the X-33, a half-scale, sub-orbital
technology demonstrator of Lockheed Martin's proposed, commercial reusable launch
vehicle called VentureStarTM. The X-33 is being developed in partnership with NASA
and Lockheed Martin Aeronautics Company in Palmdale, Calif. Marshall Space Flight
Center in Huntsville, Ala., manages the X-33 program for NASA.