| 1. | This cancelled the torque effect of the single-stage design, improving directional stability.
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| 2. | Directional stability is provided by twin boom-mounted fins, each of . area.
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| 3. | They were difficult to fly because of the aforementioned poor directional stability.
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| 4. | The Mark 1 had a tendency to roll, affecting its directional stability.
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| 5. | The tailplane features five vertical tail surfaces for improved directional stability.
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| 6. | The qualitative behavior of this equation is considered in the article on directional stability.
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| 7. | The tail rotor is ring-mounted and the horizontal tailplane mounts end-fins for directional stability.
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| 8. | The spin imparted by the gun's rifling gives projectiles directional stability and increased range.
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| 9. | By late October, the research program was expanded to include lateral and directional stability tests.
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| 10. | Seriously lacking in directional stability, the D . H . 86s were frequently in trouble.
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