Download Art of the Helicopter by John Watkinson PDF

By John Watkinson

  • "The idea and dynamics of helicopter flight are complicated and for the uninitiated, tricky. yet during this ebook, British helicopter pilot and technical writer John Watkinson units out to simplify the innovations, and clarify in lay-man's phrases how a helicopter operates. utilizing photos and over four hundred diagrams, all points of rotary flight are coated together with the heritage of rotor-craft, helicopter dynamics, rotors, tails, energy crops and keep watch over. this can be a great e-book for any helicopter enthusiast." Airforce, Fall 2004 "...clear and straightforward diagrams that relief verbal reasons of the way helicopters are made." -AOPA, 2004 "The artwork of the Helicopter is designed to de-mystify the complexity because it examines helicopter aerodynamic conception, layout and function. The ebook goals to debate its topics readably, start every one topic from first ideas and construct on these in a "clearly defined logical series utilizing simple English and transparent diagrams, keeping off pointless mathematics"... - Flight safeguard Digest, might 2004

Content:
Preface

, Pages xi-xii
Acknowledgements

, Page xiii
1 - advent to rotorcraft

, Pages 1-21
2 - Technical background

, Pages 22-60
3 - creation to helicopter dynamics

, Pages 61-116
4 - Rotors in practice

, Pages 117-165
5 - The tail

, Pages 166-190
6 - Engines and transmissions

, Pages 191-257
7 - Control

, Pages 258-322
8 - Helicopter performance

, Pages 323-346
9 - different sorts of rotorcraft

, Pages 347-378
Index

, Pages 379-390

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Extra resources for Art of the Helicopter

Example text

In-phase (a) Anti-phase ~ Velocity and phase ~ ~ ~ - 6 dB/oct. +90~ (b) Frequency In-phase I I I , - 90 ~ Flat I Acceleration and phase // (c) . ii / f Anti-phase In-phase ~'~ 90~ Resonant frequency Stiffness Damping Mass control control control Fig. 22 The behaviour of a mass-stiffness-damping system (a) amplitude, (b) velocity, (c) acceleration. Technical background force whereas above it is inversely proportional to the square of the frequency and is anti-phase to the force. In the vicinity of resonance the amplitude is a function of the damping and is said to be resistance controlled.

18 A body following a circular path is at constant acceleration and if this is calculated, it can be used to derive the forces acting. (a)shows that after a short time ~ T, the velocity has changed direction. (b) The rate of change of velocity is the acceleration. (c) shows that if ~ T is allowed to fall to zero, the acceleration points to the centre of rotation. becomes vanishingly small this vector will be seen to point to the axis of rotation as can be seen in (c). 18 increases in proportion to RPM, as does the angle between them.

A crane lifting an object does work because the force of gravity is opposed throughout the distance the load is lifted. Energy is a measure of the ability to do work. Sometimes the interchange between work and energy is reversible. Burning fuel releases energy that allows an engine to do work. This is not reversible. A wound-up spring holds the energy that drives a clock. A helicopter battery holds enough energy to start the engine. These are both 30 The Art of the Helicopter reversible. Work is done winding the spring or charging the battery and this is turned into stored energy, most of which can later be released to do work.

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