An investigation was made in the Langley V/STOL tunnel to determine, by the trailing-wing sensor technique, the effectiveness of 11 combinations of the existing flight-spoiler segments on a jumbo-jet transport aircraft model when they were deflected as trailing-vortex-alleviation devices. All 11 of the flight-spoiler configurations investigated were effective in reducing the induced rolling moment on the trailing model. This investigation is an exten¬sion of earlier wind-tunnel and flight tests which showed that the existing flight spoilers on the jumbo-jet aircraft can be used as effective trailing-vortex-alleviation devices.nEssentially all of the reduction in induced rolling moment on the trailing-wing model was realized at a spoiler deflection of 45 for single-spoiler configurations, 30° for two-spoiler configurations, and 15° for both the three- and four-spoiler configurations.
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