Therefore, a gearbox is inserted between the rotor hub and the generator.

The blades are attached to a rotor hub, which is in turn connected to a drive shaft.

These were in addition to the system used to change the angle of attack to provide control; rotor hubs tended to be very complex.

This reduces rotor hub drag since there are no exposed linkages.

The lieutenant landed roughly on the rotor hub of the helicopter parked nearby.

One of the tasks in this inspection is to grease the tail rotor hub assembly.

Sweetman points out some of the features that make it stealthy, like the cover over the tail rotor hub.

Direct rotor hub motors provide the ability to regenerative, that is the recovery of energy when braking.

The latest fault was a crack on the lower hub-shaft flange of a main rotor hub shaft.

With a spare main rotor hub sitting on the hanger floor, she proceeded to check this assembly as well, resulting in similar findings.

This includes the rotor hub.

A crash in February 1926, caused by blade root failure, led to an improvement in rotor hub design.

In response, Cierva developed a direct control rotor hub, which could be tilted in any direction by the pilot.

In contrast to the initial flights made last summer, drag-reducing fairings now cover the upper and lower rotor hubs.

The report said the flaw “could lead to further crack propagation, possibly resulting in main rotor hub failure and consequent loss of the helicopter”.

The Longbow has radar mounted atop its main rotor hub to identify and lock onto targets from a safe distance.

Dangling from a crane above the rear pylon was the rotor hub assembly, which had not been anywhere in sight at the crash site.

There's evidence that the main rotor blades remained attached to the rotor hub of the ill-fated aircraft, he said.

"Our test results show reductions in vibration, rotor hub and controls loading and a reduced acoustic emission."

Instantly the gallons of lubricating oil became a greasy cloud behind the rotor hub, and the delicate gears began to tear at one another.

(d) The rotor drive system includes any part necessary to transmit power from the engines to the rotor hubs.

Upon further inspection, he detected that these bolts were contacting the tail rotor hub and had already scraped off adjacent paint.

It was during this time that she noticed that a main rotor hub pivot-bearing bolt appeared out of alignment with its witness mark.

Two General Electric J35 turbojet engines were used, sending bleed air up through the rotor hub.

This loss can be minimized by increasing the distance between the two rotor hubs, and by elevating one hub over the other.