Counter-torque device with ducted rotor and phase modulation of the blades, for helicopter
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United States of America Patent
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Oct 22, 1996
Grant Date -
N/A
app pub date -
Aug 30, 1994
filing date -
May 4, 1994
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
The blades of the rotor which can rotate in the transverse duct have an angular distribution according to an uneven azimuth modulation given by the following sinusoidal law: .THETA.n=n.times.360.degree./b+.DELTA..THETA. sin(m.times.n.times.360.degree./b) where .THETA.n is the angular position of the nth of the blades counted in series from an arbitrary origin, b is the number of blades, m is a whole number chosen from 1 to 4, which is not prime with the number b of blades, chosen from 6 to 12, and .DELTA..THETA. is chosen to be greater than or equal to a minimum value .DELTA..THETA. min, which is such that the product .DELTA..THETA. min.times.b is chosen within a range of values extending from 1.5 radian to 1 radian.
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