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