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

By J. Seddon

This quantity is a wonderful creation to the aerodynamics of helicopters. simple Helicopter Aerodynamics offers an account of the 1st rules 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 delivering a close description of the actual phenomena concerned. The textual content assumes that the reader already has a few wisdom of changes among the fastened- and rotary-wing airplane. Many diagrams, drawings, graphs, and consultant units of information increase the textual content.

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

Example text

5(e) show a sequence of images of a small helicopter with a tip-driven rotor. The tip jet exhausts show the wake structures in several different flight regimes. 5(a) illustrates a hovering condition close to the ground surface. The wake can be seen to contract immediately below the rotor but then expand as the downflow from the rotor is interrupted by the ground forcing it to spill outwards. This phenomenon is called ‘ground effect’ and is a very important feature of helicopter performance. The wake structure shows not only the ‘tube’ of vorticity, but also the individual blade tip vortices.

And to pursue its virtues one stage further, when the direction of airflow through the rotor becomes reversed in descent, blade lift can be produced without power (‘autorotation’), allowing a controlled landing in the event of engine failure. P. Jones in the 1972 Cierva Memorial Lecture1 to the Royal Aeronautical Society. 1 Phantom. Wing tip vortices generated by a McDonnell Douglas F4 ‘Can we wonder that the conventional rotor has been a success? At this stage one might think the real question is why the fixed-wing aircraft has not died out’ But back to Lilienthal and there’s the rub.

8) when the next blade passes by is found to be lower in climb than in hover. This changes the upwash at the blade tips in such a way that for small rates of climb the power required is actually less than for the hover. 4 Vertical descent In vertical descent the nature of flow through the rotor undergoes significant changes. 5 Vortex generation in slow vertical descent. 6 Vortex-ring state in vertical descent. induced velocity vi remains positive as the rotor continues to maintain lift. Initially small recirculating regions develop around the blade tips, as shown in Fig.

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