文档介绍：Chapter 8
Helicopter Flight Mechanics
The aeroplane won’t amount to a damn thing until they get a machine that
will act like a hummingbird. Go straight up, go forward, go backward, come
straight down and alight like a hummingbird.
Thomas A. Edison (1905)
The helicopter is much easier to design than the airplane but it is worthless
when done.
Orville Wright (1906)
Question: “When will the helicopter exceed the speed of fixed-wing air-
craft?”
Reply by Igor Sikorsky: “Never”.
Question: “When will the helicopter be used for mass transport of passen-
gers?”
Reply by Igor Sikorsky: “Never”.
From a BBC documentary (1991)
Although, technically, helicopters are able to go everywhere, there are in fact
few places where they are allowed to go. In a society that breeds protest in the
name of civil liberty, the mere mention of helicopters near homes or offices
produces a rent-a-crowd swarm of folk with banners proclaiming: “To hell
with helicopters”.
. Taylor (1995)
An oft-quoted analogy is that flying an airplane is like riding a bicycle, but
hovering a helicopter is like riding a unicycle.
. Prouty and . Curtiss, in [15] (2003)
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406 8 Helicopter Flight Mechanics
Helicopter general arrangements
An aeroplane es airborne only when its (fixed) wings have sufficient
forward airspeed for producing the lift required to balance the aircraft’s
weight. Alternatively, lift can be produced by a rotor that can be seen as
a large and relatively slowly rotating propeller in a (near-)horizontal plane.
The category of prises aircraft that use one or more rotors
for the production of lift, sometimes bination with a fixed wing. A
helicopter is a rotorcraft that derives all or most of its lift from one or more
thrusting rotors that are also used for forward propulsion and flight control.
Even if it has no forward speed, the helicopter can e airborne because
its rotor generates lift at zero flight speed. Under various directions of the
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