Rotary blades
US5492448A · kind A · utility
35Cited by
10References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 8, 1994 |
| Grant date | Feb 20, 1996 |
| Priority date | — |
| Expiry date | Mar 8, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T50/10
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A rotary blade includes a fixed boundary layer control device extending spanwise on a lower surface adjacent the trailing edge to improve the lift/thrust characteristics of the blade especially at positive incidence angles. It was discovered that expected detrimental effects at zero/negative incidence did not materialize and the reasons are identified. Such blades are particularly useful for helicopter sustaining and anti-torque rotors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.