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2. Rotordynamics - Wikipedia

   en.wikipedia.org/wiki/Rotordynamics

   Rotordynamics (or rotor dynamics) is a specialized branch of applied mechanics concerned with the behavior and diagnosis of rotating structures. It is commonly used to analyze the behavior of structures ranging from jet engines and steam turbines to auto engines and computer disk storage .

3. Rotating unbalance - Wikipedia

   en.wikipedia.org/wiki/Rotating_unbalance

   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.

4. Disc brake - Wikipedia

   en.wikipedia.org/wiki/Disc_brake

   On automobiles, disc brakes are often located within the wheel A drilled motorcycle brake disc. The development of disc-type brakes began in England in the 1890s. In 1902, the Lanchester Motor Company designed brakes that looked and operated similarly to a modern disc-brake system even though the disc was thin and a cable activated the brake pad. [4]

5. Dissymmetry of lift - Wikipedia

   en.wikipedia.org/wiki/Dissymmetry_of_lift

   The dissymmetry of lift of one rotor disc is cancelled by the dissymmetry of lift of the other rotor disc. [citation needed] Tandem rotor helicopters such as the CH-47 Chinook still suffer from dissymmetry of lift, because the rotors are offset from one another. Tandem-rotor helicopters are installed with automatic cyclic feathering systems.

6. Disk loading - Wikipedia

   en.wikipedia.org/wiki/Disk_loading

   Disk loading of a hovering helicopter is the ratio of its weight to the total main rotor disk area. It is determined by dividing the total helicopter weight by the rotor disk area, which is the area swept by the blades of a rotor.

7. Blade off testing - Wikipedia

   en.wikipedia.org/wiki/Blade_off_testing

   The 1965 guidance in AC 33-1 noted the favorability of "puncture resistant rotor housings or separate armor adequate to contain broken rotor blades and stator vanes" and engine rotor and bearings strong enough "to provide a strength margin for a period of shutdown and low speed windmilling when large unbalances typical of damaged rotor blading ...