Aviation Glossary - Offset Gimbal

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Offset Gimbal

A rotor system configuration which places the pitch pivot slightly forward of the spin axis of the rotor. This offset between the pitch pivot axis and the spindle attach point results in nose-down tilting of the rotor disk with load on the rotor. This nose-down disk pitching tendency is balanced to an equilibrium or “trimmed” condition by the Trim Spring An increase in rotor thrust and g-load (from a gust) will result in the rotor tilting forward pulling against the spring to reduce the increased g-load, a stabilizing response. A rotor, of itself, is a naturally unstable system. The Offset Gimbal is an innovation used by Igor Bensen to improve the natural stability of the rotor system itself.

source: Glossary of Gyroplane Terms

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