Rotary kinetic fluid motors or pumps – Method of operation
Reexamination Certificate
2009-01-29
2011-11-22
Gilman, Alexander (Department: 2833)
Rotary kinetic fluid motors or pumps
Method of operation
Reexamination Certificate
active
08061962
ABSTRACT:
The present invention relates to a method of minimizing the noise emitted by a ducted rail rotor anti-torque device at a frequency FE and perceived at a frequency FP, in which method the diameter D, the number of blades b, and the tangential speed U of the rotor are determined so that the perceived frequency FP is less than or equal to the bottom limit frequency FL of a predetermined one-third frequency octave centered on a frequency FC.
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French Search Report dated Sep. 18, 2008 from corresponding FR Application 0800499.
Brooks & Kushman P.C.
Eurocopter
Gilman Alexander
LandOfFree
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