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US-2024328327-A1 · Oct 3, 2024 · US
Helicopter composite blade spar and method
US9505491B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9505491-B2 |
| Application number | US-201113213591-A |
| Country | US |
| Kind code | B2 |
| Filing date | Aug 19, 2011 |
| Priority date | Aug 19, 2010 |
| Publication date | Nov 29, 2016 |
| Grant date | Nov 29, 2016 |
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- Title
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Abstract
Official abstract text for this publication.
A composite spar for a helicopter blade includes two or more layers of unidirectional laminate material. One or more upper plies of bi-directional laminate extend from an upper airfoil portion of the spar disposed between adjacent layers of the two or more layers of unidirectional laminate material. One or more lower plies of bi-directional laminate material extend from a lower airfoil portion of the spar disposed between adjacent layers of the two or more layers of unidirectional material. The upper plies and the lower plies overlap defining a crackstopper layer configured to prevent propagation of defects in the spar.
First claim
Opening claim text (preview).
The invention claimed is: 1. A composite spar for a helicopter blade comprising: first and second upper layers of unidirectional laminate material extending from an upper airfoil portion of the spar and terminating at a backwall portion of the spar between the upper airfoil portion and a lower airfoil portion; first and second lower layers of unidirectional laminate material extending from the lower airfoil portion of the spar and terminating at the backwall portion, the first u…
Assignees
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Classifications
Operations & Transport · mapped topic
Operations & Transport · mapped topic
Operations & Transport · mapped topic
- B64C27/473Primary
Operations & Transport · mapped topic
Operations & Transport · mapped topic
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Frequently asked questions
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- What does patent US9505491B2 cover?
- A composite spar for a helicopter blade includes two or more layers of unidirectional laminate material. One or more upper plies of bi-directional laminate extend from an upper airfoil portion of the spar disposed between adjacent layers of the two or more layers of unidirectional laminate material. One or more lower plies of bi-directional laminate material extend from a lower airfoil portion …
- Who is the assignee on this patent?
- Byrnes Francis Edward, Fehrman Jacob A, Sikorsky Aircraft Corp
- What technology area does this patent fall under?
- Primary CPC classification B64C27/473. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Tue Nov 29 2016 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).