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Coning is a phenomenon which affects helicopter rotor discs. The tips of the helicopter rotor blades move faster through the air than the parts of the blades near the hub, so they generate more lift, which pushes the tips of the blades upwards, resulting in a slight cone shape to the rotor disc. This is balanced by centrifugal force.
The part of the disc working on clean air therefore sees a higher angle of attack than the portion of the disc which is working on descending air. [5] The result is that the portion in clean air develops more lift. The disc rolls to the side, rather than pitching backwards as one might naively expect, because of phase lag. Phase lag is a ...
An actuator disk accelerating a fluid flow from right to left. In fluid dynamics, momentum theory or disk actuator theory is a theory describing a mathematical model of an ideal actuator disk, such as a propeller or helicopter rotor, by W.J.M. Rankine (1865), [1] Alfred George Greenhill (1888) and Robert Edmund Froude (1889).
When a helicopter is being maneuvered, its disk loading changes. The higher the loading, the more power needed to maintain rotor speed. [3] A low disk loading is a direct indicator of high lift thrust efficiency. [4] Increasing the weight of a helicopter increases disk loading. For a given weight, a helicopter with shorter rotors will have ...
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.
Filling out the rest of this month's top MySpace games are a slew of pet care games such as SuperPoke Pets by Slide in ninth place with RockYou Pets tailing behind them in the 10 spot.
If you’re a retiree coming into the new year, it’s a great time to think through your financial goals for the next 12 months. This could be an opportunity to rebalance your portfolio to reduce ...
No. 2 Georgia is resting its national championship hopes on backup quarterback Gunner Stockton following Carson Beck's season-ending elbow surgery on Monday.