John Watkinson's Art of the Helicopter PDF

By John Watkinson

  • "The idea and dynamics of helicopter flight are advanced and for the uninitiated, tough. yet during this publication, British helicopter pilot and technical writer John Watkinson units out to simplify the options, and clarify in lay-man's phrases how a helicopter operates. utilizing images and over four hundred diagrams, all features of rotary flight are lined together with the background of rotor-craft, helicopter dynamics, rotors, tails, strength crops and keep an eye on. this is often an outstanding ebook for any helicopter enthusiast." Airforce, Fall 2004 "...clear and straightforward diagrams that reduction verbal causes of the way helicopters are made." -AOPA, 2004 "The paintings of the Helicopter is designed to de-mystify the complexity because it examines helicopter aerodynamic idea, layout and function. The booklet goals to debate its matters readably, start every one topic from first rules and construct on these in a "clearly defined logical series utilizing undeniable English and transparent diagrams, fending off pointless mathematics"... - Flight safeguard Digest, might 2004

Content:
Preface

, Pages xi-xii
Acknowledgements

, Page xiii
1 - creation to rotorcraft

, Pages 1-21
2 - Technical background

, Pages 22-60
3 - advent 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 kinds of rotorcraft

, Pages 347-378
Index

, Pages 379-390

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Extra info for Art of the Helicopter

Sample text

The final quantity to be considered is momentum. This is equal to the mass multiplied by the velocity. The use of momentum will better be explained when the topic of lift generation is dealt with in Chapter 3. A helicopter in flight has both kinetic and potential energy. This energy was stored in the helicopter by doing work against the earth's gravitational field. Thus the helicopter's potential and kinetic energy exists with respect to the earth and Newton's laws determine what the helicopter will do with respect to the earth when forces act upon it.

Air conditioners work in the same way. If the volume is fixed, as temperature rises, the velocity of the molecules increases and so the impact at each collision with the walls of any container is greater and the pressure rises. Alternatively the same pressure can be exerted in a given volume with a smaller mass of gas. Thus in the atmosphere where pressure increases can be released by free movement, the result of an increase in air temperature is that the density goes down. Density is also affected by humidity.

It was shown above that F = m x a, it can be seen that the inward or centripetal (Latin: centre seeking) force needed to accelerate an object in a circular path is simply: F = m x O92 X r as o) = v/r then F = m x v2/r When a mass moves along, or translates, it has kinetic energy. When an object rotates, it also has kinetic energy, but the amount is less easy to calculate. This is because all elements of a translating mass move at the same velocity, whereas in a rotating mass different elements move at different velocities according to how far from the axis they are.

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