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Basic Helicopter Aerodynamics: An Account of First by J. Seddon PDF

By J. Seddon

ISBN-10: 063205283X

ISBN-13: 9780632052837

This quantity is a wonderful advent to the aerodynamics of helicopters. easy Helicopter Aerodynamics presents an account of the 1st ideas within the fluid mechanics and flight dynamics of single-rotor helicopters. The textual content is meant to supply, in a quick quantity, an advent to the speculation of rotary-wing airplane to be used by means of undergraduate and graduate scholars, whereas supplying an in depth description of the actual phenomena concerned. The textual content assumes that the reader already has a few wisdom of alterations among the mounted- and rotary-wing airplane. Many diagrams, drawings, graphs, and consultant units of information increase the textual content.

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Extra info for Basic Helicopter Aerodynamics: An Account of First Principles in the Fluid Mechanics and Flight Dynamics of the Single Rotor Helicopter

Sample text

11 shows such an example. 10 Kamov Helix coaxial helicopter. (Guy Gratton) Kaman K-Max synchropter. (Kaman) ticular aircraft also introduces the concept of compounding where lift and/or propulsion is supplemented by extra devices. Such aircraft are designated lift compounded (lift alone), thrust compounded (propulsion alone) or fully compounded (both lift and propulsion). For the Rotodyne, in forward flight, wings aid the rotor lift and airscrews provide the propulsion. It is therefore a fully compounded helicopter.

5. Becoming evident when Vc reaches a level about half vi, an interaction takes place between the upward flow around the disc and the downward flow through it, resulting in the formation of a vortex ring encircling the rim of the disc, doughnut fashion. The situation is illustrated in Fig. 6. As this vortex-ring state develops the flow becomes very unsteady and the rotor exhibits high levels of vibration. 7 Turbulent-wake state in vertical descent. and roll. Flight in the developed vortex-ring state, which reaches its worst condition when the descent rate is about three quarters of the hover induced velocity, is unpleasant and potentially dangerous.

In this turbulent-wake state (Fig. 7) flight is still rough but less so than in the vortex-ring state. Simple momentum theory is again not applicable, since energy is dissipated in the eddies of the wake. At large descent rates, when Vc is numerically greater than about 2vi, the flow is everywhere upwards relative to the rotor, producing a windmill-brake state, in which power is transferred from the air to the rotor. With a flow pattern as in Fig. 8 Windmill-brake state in vertical descent. 9 Variation of induced power in climb and descent.

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Basic Helicopter Aerodynamics: An Account of First Principles in the Fluid Mechanics and Flight Dynamics of the Single Rotor Helicopter by J. Seddon


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