Airplane Performance, Stability and Control by Courtland D. Perkins, Robert E. Hage

By Courtland D. Perkins, Robert E. Hage

First written in 1949, this can be a vintage textual content in aeronautical engineering. It covers plane functionality in reciprocating engine craft, propeller functionality, in addition to airplane balance and keep watch over. this is often a good publication for the pro and the intense beginner plane maker. it truly is written in an easy and simple to appreciate demeanour. To get the main out of this booklet, readers must have an figuring out of differential calculus.

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The rotor blade requires an inward or centripetal force to accelerate it into a circular path. Each element of the blade is at a different radius and so calculating the overall Technical background force would be complicated were it not for the fact that the blade mass appears for this purpose to be concentrated at the radius of gyration. The figures for root tension are quite impressive. In a typical model helicopter a tension of 500 N is normal. In a full size helicopter 100 000 N is not unusual.

26(c) shows what happens if the base bandwidth increases beyond the Nyquist frequency. The lower sideband now overlaps the baseband signal. As a result, the output frequency appears to fall as the input frequency rises. This is the phenomenon of aliasing. 27 shows aliasing in the time domain. The waveform carried in the envelope of the samples is not the original, but has a lower frequency. There is an interesting result when the two frequencies are identical. The lower sideband frequency becomes zero.

31 (a)A rotating body is not in equilibrium. Centripetal force accelerates it into a circle. When the frame of reference rotates at the same speed to arrest the rotation, there is no acceleration to balance centripetal force and so a virtual force, railed centrifugal force, is imagined to exist. (b)If a blade flaps up its CM moves closer to the shaft and the Mol (moment of inertia) falls. It will conserve momentum by swinging forwards. (c)In a rotating frame of reference a blade has no momentum and a virtual force called a Coriolis force is imagined to cause the forward swing.

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