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Date: Jul 11, 2010
Bell patents
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http://www.google.com/patents/about?id=NOQpAAAAEBAJ&dq=%22bell+helicopter%22

Inventor: Frank M. Shallene
Assignee: Bell Helicopter Textron Inc.

U.S. Classification
D12327

What is claimed is:

The ornamental design for a helicopter, as shown and described.



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Date: Jul 12, 2010
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Helicopter power train for distributing rotor blade flapping displacements ... Wesley L. Cresap


A helicopter power train is disclosed in which the rotor tip-path plane (218) inclination relative to the helicopter air frame (200) is achieved by blade flapping motions distributed through a plurality of drive train components rather than through blade flapping motion about a single flap hinge....(see link for more)
Inventor: Wesley L. Cresap
Assignees: Bell Helicopter Textron, Inc.

U.S. Classification
416/138; 416/141; 244/172.7

International Classification
B64C 2704

What is claimed is:

1. A helicopter power train including a transmission for driving a multi-blade rotor for accommodating rotor tip-path plane flapping deflection comprising in combination:

(a) a resilient mounting including a plurality of independently operating mounts with travel limits for coupling the transmission to the fuselage of the helicopter, said mounting to accommodate from about 15% to 35% of said deflection,
(b) a flexible mast extending from said transmission to said rotor to accommodate from about 10% to 30% of said deflection,
(c) a yoke secured to said mast for connecting said blades to said mast, said yoke having a thin flexure section immediately outboard of said mast to accommodate from about 40% to 60% of said deflection, and
(d) each of said blades including means for providing beam bending to accommodate from 0% to about 10% of said deflection.

2. A helicopter power train as recited in claim 1 wherein said resilient mounting includes a load-bearing elastomeric member.

3. A helicopter power train as recited in claim 1 wherein said flexible mast comprises a tubular member extending from said transmission to support said yoke and drive said blades.

4. A helicopter power train including a transmission for driving a multi-blade rotor for accommodating rotor tip-path plane flapping deflection comprising in combination:

(a) a resilient mounting including a plurality of independently operating mounts with travel limits for coupling the transmission to the fuselage of the helicopter, said mounting to accommodate approximately 25% of said flapping deflection;
(b) a flexible mast extending from said transmission to said rotor to accommodate approximately 20% of said flapping deflection;
(c) a yoke secured to said mast for connecting said blades to said mast, said yoke having a thin flexure section immediately outboard of said mast to accommodate approximately 50% of said flapping deflection; and
(d) each of said blades including means for providing beam bending to accommodate approximately 5% of said flapping deflection.

5. A helicopter drive train including a transmission for driving a multi-blade rotor where rotor flapping tilts the blade tip-path plane to an angular deflection with regard to the helicopter fuselage, the combination comprising:

(a) a resilient mounting including a plurality of independently operating mounts with travel limits for coupling the transmission to the helicopter fuselage, said mounting statically accommodating a pre-established percentage range of the total said angular deflection,
(b) a mast extending from said transmission and having beamwise flexibility for statically accommodating a pre-established percentage range of the total said angular deflection;
(c) yoke structure secured to said mast for supporting said rotor blades and including a flexure segment immediately outboard of said mast for dynamically accommodating a part of said rotor flapping to accommodate a pre-established percentage range of the total said angular deflection, and
(d) each of said blades including means for dynamically accommodating a part of said rotor flapping to accommodate a pre-established percentage range of the total said angular deflection.


Drawing Drawing Drawing Drawing Drawing


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Date: June 2nd
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Find credited to VictorXL188 at SPF, a new design patented in 2017 for a dual tilt-wing aircraft:

https://patents.google.com/patent/US10597152B2/en?oq=10597152



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lllll   As of 2019 I have transitioned; My name is now Rei. Please don't deadname or misgender me, thank you. <3   lllll

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