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NASA Technical Reports Server (NTRS) 19920005858: Trim drag reducti... |
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by NASA Technical Reports Server (NTRS) |
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The results of a study to investigate concepts for |
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minimizing trim drag of horizontal takeoff single-stage- |
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to-orbit (SSTO) vehicles are presented. A generic |
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hypersonic airbreathing conical configuration was used as |
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the subject aircraft. The investigation indicates that |
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extreme forward migration of the aerodynamic center as |
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the vehicle accelerates to orbital velocities causes |
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severe aerodynamic instability and trim moments that must |
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be counteracted. Adequate stability can be provided by |
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active control of elevons and rudder, but use of elevons |
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to produce trim moments results in excessive trim drag |
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and fuel consumption. To alleviate this problem, two |
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solution concepts are examined. Active control of the |
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center of gravity (COG) location to track the aerodynamic |
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center decreases trim moment requirements, reduces elevon |
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deflections, and leads to significant fuel savings. |
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Active control of the direction of the thrust vector |
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produces required trim moments, reduces elevon |
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deflections, and also results in significant fuel |
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savings. It is concluded that the combination of active |
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flight control to provide stabilization, (COG) position |
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control to minimize trim moment requirements, and thrust |
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vectoring to generate required trim moments has the |
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potential to significantly reduce fuel consumption during |
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ascent to orbit of horizontal takeoff SSTO vehicles. |
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Date Published: 2016-09-27 16:37:18 |
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Identifier: NASA_NTRS_Archive_19920005858 |
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Item Size: 26917196 |
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Language: english |
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Media Type: texts |
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