| 11. | It is not to be confused with directional stability, as experienced by aircraft in flight.
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| 12. | It suffered from a lack of directional stability and the engines were unreliable and vibrated above.
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| 13. | The forces which result in directional stability, propulsion and braking may all be traced to creep.
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| 14. | The Swift has no vertical stabilizer and so faces the need for directional stability in yaw.
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| 15. | The horizontal tailplane mounts end-fins for directional stability.
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| 16. | In contrast to shell gave it directional stability.
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| 17. | These tests also revealed a lack of directional stability : Mitchell accordingly enlarged the fin area.
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| 18. | It also added more vertical surface to the aircraft to maintain directional stability at high speeds.
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| 19. | Patients also exhibited a greater variability in the postural oscillation, evaluated by the directional stability index.
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| 20. | Additional directional stability was achieved in the Rotachute Mark IV, that introduced endplates onto the rigid tailplanes.
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