By alastair k. (author) ; fitzpatrick, eric (author) ; cooke (author) cooke
Particular in its breadth of assurance functionality, balance and keep an eye on, and aerosystems all discussed....
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Extra resources for Helicopter Test and Evaluation (Aiaa Education Series)
At high power settings, it is possible to pump so much air from beneath the rotor that the rate of descent increases thereby exacerbating the problem. The pilot may attempt to arrest the rate of descent by application of increased collective pitch but this tends to increase the rate of descent still further. If on the other hand the pilot lowers the collective lever the thrust is reduced and the helicopter also increases its rate of descent. This dangerous phenomenon is often called power settling.
The hub force appears because there is an asymmetry of drag acting on opposing blades. When a blade reaches the advancing side, it will see increased drag, a component of which will act rearwards. An opposing blade will see reduced drag as it enters the retreating side. Although a component of the drag on the retreating side acts forwards, it will be less than on the advancing side and a net rearward hub force will result. 1 Rotor proﬁle power From Fig. 13 the elemental rotor proﬁle power is given by: Pó) Qó)r Dó)r 1 ()ròVsin )2c r C D 2 The proﬁle power can be obtained by multiplying P by the number of blades, b, and integrating both along the radius and around the azimuth: R1 )r C ()ròVsin )2c dr d D 2 0 0 Note that 1/2 is introduced because the average power required around the azimuth is needed.
Likewise, no allowance has been made for three-dimensional ﬂow eﬀects such as tip vortices. Minor modiﬁcations to the blade element theory are used to account for these important eﬀects. 1 Variations in induced velocity So far, it has been assumed that the induced velocity is constant across the disk. In addition, no description has been given of the precise relationship between blade pitch and induced velocity. In fact ﬂow is induced downwards through the disk as a consequence of the aerofoil’s inclination to the direction of rotation.
Helicopter Test and Evaluation (Aiaa Education Series) by alastair k. (author) ; fitzpatrick, eric (author) ; cooke (author) cooke