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Trim Drag Reduction Concepts For Horizontal Takeoff Single Stage To Orbit Vehicles
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Author :National Aeronautics and Space Adm Nasa Publisher :Independently Published ISBN 13 :9781728803999 Total Pages :36 pages Book Rating :4.8/5 (39 download)
Book Synopsis Trim Drag Reduction Concepts for Horizontal Takeoff Single-Stage-To-Orbit Vehicles by : National Aeronautics and Space Adm Nasa
Download or read book Trim Drag Reduction Concepts for Horizontal Takeoff Single-Stage-To-Orbit Vehicles written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2018-10-15 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: The results of a study to investigate concepts for minimizing trim drag of horizontal takeoff single-stage-to-orbit (SSTO) vehicles are presented. A generic hypersonic airbreathing conical configuration was used as the subject aircraft. The investigation indicates that extreme forward migration of the aerodynamic center as the vehicle accelerates to orbital velocities causes severe aerodynamic instability and trim moments that must be counteracted. Adequate stability can be provided by active control of elevons and rudder, but use of elevons to produce trim moments results in excessive trim drag and fuel consumption. To alleviate this problem, two solution concepts are examined. Active control of the center of gravity (COG) location to track the aerodynamic center decreases trim moment requirements, reduces elevon deflections, and leads to significant fuel savings. Active control of the direction of the thrust vector produces required trim moments, reduces elevon deflections, and also results in significant fuel savings. It is concluded that the combination of active flight control to provide stabilization, (COG) position control to minimize trim moment requirements, and thrust vectoring to generate required trim moments has the potential to significantly reduce fuel consumption during ascent to orbit of horizontal takeoff SSTO vehicles. Shaughnessy, John D. and Gregory, Irene M. Langley Research Center RTOP 505-64-40-01
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