Aircraft performance by W. Austyn Mair

By W. Austyn Mair

This ebook describes the rules and equations required for comparing the functionality of an plane. After introductory chapters at the surroundings, uncomplicated flight conception, and drag, the publication is going directly to ponder intimately the estimation of mountaineering functionality, the correct features of energy crops, takeoff and touchdown functionality, variety, and turning functionality.

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For instance, specific fuel consumption might be a key parameter in gas turbine engine design, but it is not a design variable. Nor is bypass ratio a design variable in the sense of the geometry-centred design processes we are dealing with here, though – scope for more confusion – the first, conceptual, non-geometric phase of the design of a turbofan engine might well view bypass ratio as a design variable. A simple test to apply to a set of parameters related to a design, which might determine whether they are higher level metrics or design variables (or a mixture), is to consider what would happen if several engineers were issued with these sets of parameters and their unambiguous definitions and they were told to come up, working independently, with the corresponding design blueprints.

The goal of the exercise is therefore to wrap these markers with the ‘tightest’ possible cross-section curve. In what follows we shall take a three-stage approach to solving this problem, gradually ramping up the flexibility of the cross-section geometry. Stage 1: A Circle From a purely structural standpoint, the most efficient shape for a slender pressure vessel is a cylinder with hemispherical end caps. As a result, a large proportion of aircraft with pressurized cabins feature a fuselage with a circular cross-section.

In Chapter 9 we shall discuss the construction of 3D wings in the same spirit, building upon the parameterization of aerofoil cross-sections (Chapters 5, 6 and 7) – analogous to the fuselage cross-sections here – and planforms (Chapter 8), analogous to the side profile definition of the fuselage in this chapter. 6 Necessary Flexibility One of the key themes running through this book is the control of the dimensionality of a parametric geometry – that is, how we make sure that the desire for flexibility does not render the geometrical formulation completely unusable in an optimization context.

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