| 11. | The Euler force is perpendicular to the centrifugal force and is in the plane of rotation.
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| 12. | Above three dimensions two or more angles are needed, each associated with a plane of rotation.
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| 13. | Simple rotations can be identified in all dimensions, as rotations with just one plane of rotation.
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| 14. | These planes of rotation are perpendicular to the axes of rotation and do not move as the axles rotate.
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| 15. | In two and three dimensions all rotations are simple, in that they have only one plane of rotation.
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| 16. | A general rotation is not simple, and has the maximum number of planes of rotation as given above.
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| 17. | In addition arguments of the complex roots are the magnitudes of the bivectors associated with the planes of rotations.
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| 18. | In this latter case, the plane of rotation of the instrument is levelled, along with the spirit level.
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| 19. | This can be done using geometric algebra, with the planes of rotations associated with simple bivectors in the algebra.
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| 20. | For vertical take-off, the rotors would be lowered till their plane of rotation was parallel with the ground.
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