However, as entry of the rotor tip into the supersonic aerodynamic realm is one of the unstable conditions that affects forward flight, even helicopters with two rotor discs rotating in opposite senses will be subject to a never-exceed speed.
22.
The advancing blade continues to generate lift, but the retreating blade enters a stall condition, usually resulting in an uncommanded increase in pitch of the nose and a roll in the direction of the retreating side of the rotor disc.
23.
In a zero airspeed hover the rotor blades, regardless of their position in rotation, have equal airspeeds and therefore equal lift . In forward flight the advancing blade has a higher airspeed than the retreating blade, creating unequal lift across the rotor disc.
24.
Rotorcraft have spinning blades called a " rotor " which spins in the horizontal plane to provide lift . Forward thrust is usually obtained by angling the rotor disc slightly forward so that a proportion of its lift is directed backwards; these are called helicopters.
25.
In this case, dissymmetry of lift and blade flapping could cause the rotor disc to tilt aft . With full forward cyclic control already applied, the rotor disc might not be able to be lowered, resulting in possible loss of control, or the rotor blades striking the tail boom.
26.
Since the lift generated by an aerofoil increases as its relative airspeed increases, on a forward-moving helicopter the blade-tip at position A produces more lift than that at point B . So the rotor disc produces more lift on the right hand side than on the left hand side.
27.
In this case, dissymmetry of lift and blade flapping could cause the rotor disc to tilt aft . With full forward cyclic control already applied, the rotor disc might not be able to be lowered, resulting in possible loss of control, or the rotor blades striking the tail boom.
28.
Frank Cordell assisted McHale with accessing the film posters such as " Julius Caesar " ( 1953 ) for the collage murals, the " Forbidden Planet " items, the juke box, and installing the film projector, and installing the Duchamp rotor discs given to McHale by Marcel Duchamp in New York.
29.
This situation is identical to what a helicopter experiences, but a helicopter can reduce or increase the angle of attack of individual blades of the rotor ( decreasing the angle of attack on the advancing blade, while increasing the angle of attack on the retreating blade ) in order to keep the lift of the rotor disc balanced.
30.
The situation becomes more complex when helicopters with two sets of rotor blades are considered, since in theory at least, the dissymetry of lift of one rotor disc is cancelled by the increased lift of the other rotor disc : the two rotor discs of twin-rotor helicopters rotate in opposite senses, thus reversing the relevant directions of vector addition.
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