“It is one of the hazards that is highlighted in teetering rotor helicopters,” Joslin said.

All those two-blade Robinsons are exempt because their “teetering” rotors are a single rigid structure, like a see-saw. The only rotors that can produce ground resonance are those with three ...

Mast bumping occurs in helicopters with teetering rotor systems, like the Bell 206, when excessive cyclic control movements lead to the rotor hub tilting too far.

Mast bumping is a helicopter issue where the rotor hub strikes the mast, often in two-bladed, teetering rotor systems like Bell models. It happens during low-G maneuvers or abrupt control inputs ...

The California-based Robinson Helicopter Co. manufactures the R44, as well as the R66, the model of aircraft flown by Mark D. Croce in last month's fatal crash in central Pennsylvania. Based on an ...

A Robinson R44 helicopter broke up in flight as a result of extreme teetering, either due to turbulence or inappropriate control inputs, an Australian Transport Safety Bureau investigation has found.

With its twin-bladed rotors with teetering hinges, Seawind’s turbine achieves higher speeds than conventional turbines, and the teetering hinge decouples the shaft from the rotor, protecting the ...