Helicopter blade airfoil
US4744728A · kind A · utility
12Cited by
8References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 3, 1986 |
| Grant date | May 17, 1988 |
| Priority date | — |
| Expiry date | Sep 3, 2006 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB64C27/467
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A family of airfoil cross sections, termed SC21xx, for use in a helicopter blade is disclosed. The airfoil (36) achieves maximum lift performance equivalent to prior art airfoil configurations without incurring increased aerodynamic drag at high velocities. The airfoil (36) was developed by thickening and drooping the leading edge region (38) of the prior art airfoil (30) improving lift in the leading edge region (38) and delaying the formation of sonic shock waves at high velocities.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.