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3 Cards in this Set
- Front
- Back
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Near ground Induced flow/vortex generation |
Near ground reduces induced flow, increases angle of attack, and increases rotor efficiency. Near ground the downward and outward flow of air restricts vortex generation. Smaller vortex make more efficient blade |
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In ground effect |
Rotor efficiency is increased by ground effect to a height of about one rotor diameter (measured from the ground to the rotor disk) . IGE hover and induced flow reduced. This increase in AOA requires a reduced blade pitch angle. This reduces the power required to hover IGE. |
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Oge |
Above IGE, the power required to hover remains nearly constant, given similar conditions (such as wind). Induced flow velocity is increased causing a decrease in AOA. A higher blade pitch angle is required to maintain the same AOA as in IGE hover. The increased pitch angle creates more drag. More power to hover OGE than IGE is required by this increased pitch angle and drag |
