Rotor for passively stable helicopter

Details Rotor for passively stable helicopter Rotor for passively stable helicopter

2005-06-28

2009-02-24

Look, Edward (Department: 3745)

Fluid reaction surfaces (i.e., impellers)

Working member foldable, pivotable or collapsible to non-use...

C416S194000, C416S195000

Reexamination Certificate

active

07494320

ABSTRACT:
A rotor (10) that enables an aircraft to become passively stable in hover. The inner part of the rotor blades (11) have a pitch angle fixed relative to a reference plane perpendicular to the rotor shaft (18) axis, and the tip of the rotor blades being connected to a ring (12) encircling the rotor. Each blade is connected to the rotor shaft by a separate hinge having a hinge axis perpendicular to both the rotor shaft axis and to the blade. Because the rotor blades can also easily twist the rotor can tilt freely in any direction. The rotor blades may be disconnected from the ring and folded up for easy transport.

REFERENCES:
patent: 4104003 (1978-08-01), Mouille
patent: 5639215 (1997-06-01), Yamakawa
patent: 5879131 (1999-03-01), Arlton et al.
patent: 6460802 (2002-10-01), Norris
patent: 6659395 (2003-12-01), Rehkemper
patent: 2004/0245376 (2004-12-01), Muren

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