Download PDF by John Watkinson: Art of the Helicopter
By John Watkinson
"The conception and dynamics of helicopter flight are advanced and for the uninitiated, tricky. yet during this e-book, British helicopter pilot and technical writer John Watkinson units out to simplify the suggestions, and clarify in lay-man's phrases how a helicopter operates. utilizing photos and over four hundred diagrams, all facets of rotary flight are coated together with the heritage of rotor-craft, helicopter dynamics, rotors, tails, strength crops and keep an eye on. this is often a great e-book for any helicopter enthusiast." Airforce, Fall 2004 "...clear and straightforward diagrams that relief verbal factors 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 e-book goals to debate its topics readably, commence every one topic from first rules and construct on these in a "clearly defined logical series utilizing simple English and transparent diagrams, fending off pointless mathematics"... - Flight protection Digest, might 2004
, Pages xi-xii
, 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 forms of rotorcraft
, Pages 347-378
, Pages 379-390
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Extra info for Art of the Helicopter
These are examples of the Coriolis effect, named after the mathematician who derived the mechanics of rotating frames of reference. 3 l(c) shows that when the frame of reference rotates at the same angular velocity as the component of interest, the rotation apparently disappears. However, the conservation of momentum effect is still occurring and the blade appears to accelerate with respect to the frame of reference. In order to account for this acceleration, a new virtual force is imagined to act.
The average velocity and the displacement of all the molecules in a layer of air near to a moving body is the same as the velocity and displacement of the body. Movement of a body results in a local increase, or decrease, in pressure. Thus sound is both a pressure and a velocity disturbance. Integration of the velocity disturbance gives the ,displacement. Despite the fact that a gas contains endlessly colliding molecules, a small mass or particle of gas can have stable characteristics if molecules leave and are replaced by others having identical properties.
3 l(c) shows that when the frame of reference rotates at the same angular velocity as the component of interest, the rotation apparently disappears. However, the conservation of momentum effect is still occurring and the blade appears to accelerate with respect to the frame of reference. In order to account for this acceleration, a new virtual force is imagined to act. This is called the Coriolis force. In the real world the Coriolis force does not exist, like centrifugal force, it is a mathematical convenience needed to allow the use of a rotating frame of reference.
Art of the Helicopter by John Watkinson