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When it does occur, recovery is often possible if action is taken quickly. If sufficient rotor RPM exists, immediate takeoff can restore rotor balance by allowing the airframe to move and help dampen the oscillation freely. [1] Complete shutdown may be sufficient if rotor RPM is very low during a ground resonance incident.
In a soft-bearing machine, balancing is done at a frequency higher than the resonance frequency of the suspension. The suspension's displacement is dictated by the distance of the rotor's principal axis of inertia relative to the rotor's rotational axis defined by the rotor bearings. Both types of machines have various advantages and disadvantages.
A static balance (sometimes called a force balance [2] [3]) occurs when the inertial axis of a rotating mass is displaced from and parallel to the axis of rotation.Static unbalances can occur more frequently in disk-shaped rotors because the thin geometric profile of the disk allows for an uneven distribution of mass with an inertial axis that is nearly parallel to the axis of rotation.
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A current Gleaner and world first is that they created the first Class VIII transverse rotor combine. This happened when AGCO introduced the new Gleaner S88 series combine in 2014. [7] Also during this year of manufacturing, a 7-cylinder 9.8L diesel engine, built by AGCO Sisu (Later AGCO POWER), was first used in the S78 and S88 models.
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Summit Racing Equipment currently sponsors NHRA Camping World Drag Racing Series Funny Car driver Tim Wilkerson, [3] Top Fuel drivers Antron Brown [4] and Clay Millican, [5] and Pro Stock drivers Greg Anderson, Deric Kramer, Matt Hartford, Kyle Koretsky, Dallas Glenn, and Rodger Brogdon.