Art of the Helicopter by John Watkinson

By John Watkinson

  • "The conception and dynamics of helicopter flight are complicated and for the uninitiated, tough. yet during this booklet, 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 elements of rotary flight are coated together with the background of rotor-craft, helicopter dynamics, rotors, tails, strength vegetation and regulate. this can be an exceptional booklet for any helicopter enthusiast." Airforce, Fall 2004 "...clear and straightforward diagrams that relief verbal motives 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 matters readably, start every one topic from first rules and construct on these in a "clearly defined logical series utilizing simple English and transparent diagrams, heading off pointless mathematics"... - Flight security Digest, might 2004


, Pages xi-xii

, Page xiii
1 - advent 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

, Pages 379-390

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6 shows how forces are represented. An arrow is drawn in the direction of each force, and the length of the arrow is proportional to the magnitude. In this case two different forces act on the same point, and in different directions. We can find the resultant force, which is a single force having the same effect as the others together, by completing the parallelogram as shown, and drawing in the diagonal. The body will accelerate in the direction of the resultant. Alternatively, by drawing a force of equal length to the resultant but in the opposite direction, we have found the force needed to maintain equilibrium with the other two.

The remainder is a mixture of water in the gaseous state and various other traces. The reactive nature of oxygen is both good and bad. The good part is that it provides a source of energy for life and helicopters alike because hydrocarbons can react with oxygen to release energy. The bad part is that many materials will react with oxygen when we would rather they didn't. Chemically, combustion and corrosion are one and the same thing. The difference is based on the human reaction to the chemical reaction.

This is exactly what happens in a Compact Disc player. As the baseband frequency rises, the lower sideband frequency must fall. However, this can only continue until the base bandwidth is half the sampling rate. This is known as the Nyquist frequency and it represents the highest baseband frequency at which the original signal can be recovered by a low-pass filter. (a) 0 Fs 2Fs 3F s etc. Baseband t/// j F i l t e r response (b) 0 IIi Fb Fs I i I I 2F s 3F s 2Fs 3Fs etc. Alias zone § (c) 0 Fb Fs t (Fs + Fb) etc.

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