Flight stability and control and performance results from the Linear Aerospike SR-71 Experiment (LASRE) | Zendy

Timothy R. Moes | Zendy; Brent Cobleigh | Zendy; Timothy Cox | Zendy; Timothy Conners | Zendy; Kenneth W. Iliff | Zendy; Bruce Powers | Zendy

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Flight stability and control and performance results from the Linear Aerospike SR-71 Experiment (LASRE)

Author(s) -

Timothy R. Moes,

Brent Cobleigh,

Timothy Cox,

Timothy Conners,

Kenneth W. Iliff,

Bruce Powers

Publication year - 1998

Publication title -

nasa sti repository (national aeronautics and space administration)

Language(s) - English

Resource type - Conference proceedings

DOI - 10.2514/6.1998-4340

Subject(s) - stability (learning theory) , control (management) , aerospace engineering , control theory (sociology) , aeronautics , computer science , engineering , artificial intelligence , machine learning

ayThe Linear Aerospike SR-71 Experiment (LASRE) ispresently being conducted to test a 20-percent-scale azversion of the Linear Aerospike rocket engine. Thisrocket engine has been chosen to power the X-33 Single bStage to Orbit Technology Demonstrator Vehicle. Therocket engine was integrated into a lifting body B.L.configuration and mounted to the upper surface of an cSR-71 aircraft. This paper presents stability and controlresults and performance results from the envelope c.g.expansion flight tests of the LASRE configuration up to C!Mach 1.8 and compares the results with wind tunnelpredictions. Longitudinal stability and elevator control CIbeffectiveness were well-predicted from wind tunneltests. Zero-lift pitching moment was mispredictedtransonically. Directional stability, dihedral stability, and C/prudder effectiveness were overpredicted. The SR-71handling qualities were never significantly impacted as a Ctrresult of the missed predictions. Performance resultsconfirmed the large amount of wind-tunnel-predictedtransonic drag for the LASRE configuration. This drag CI_increase made the performance of the vehicle so poorthat acceleration through transonic Mach numbers couldnot be achieved on a hot day without depleting the CI_°available fuel.Cl_rCmCmb

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