Vibration-reducing and noise-reducing spoiler for helicopter...

Details Vibration-reducing and noise-reducing spoiler for helicopter... Vibration-reducing and noise-reducing spoiler for helicopter...

2007-02-22

2008-08-19

Look, Edward K. (Department: 3745)

Fluid reaction surfaces (i.e., impellers)

Specific blade structure

Tined or irregular periphery

C416S062000

Reexamination Certificate

active

07413408

ABSTRACT:
A spoiler attached to helicopter main rotor blades, tail rotor blades, propellers, aircraft wings, and machined into turbine blades, that reduces vibration and silences their operation. Also, when added to a substantial part of the trailing edges of its rotor blades, the spoiler eliminates the repetitive pop-pop sound common to current helicopter flight. Preferably, the spoiler is made from durable resilient materials that bend with resistance for high speed oscillation and it is secured on the top or bottom side, or both, of the trailing edge of a blade or wing. Further, the free edge of the spoiler exhibits a non-repeating pattern of feather-like projections that collectively break up vortex formation so that the next wing or blade traveling through the same location has clean air/fluid in which to move. In addition to noise reduction, the spoiler increases blade efficiency and wing lift.

REFERENCES:
patent: 5088665 (1992-02-01), Vijgen et al.
patent: 5533865 (1996-07-01), Dassen et al.

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