Helicopter blade airfoil
USRE33589E · kind E · reissue
2Cited by
9References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 17, 1990 |
| Grant date | May 14, 1991 |
| Priority date | — |
| Expiry date | May 17, 2010 |
Classification
- Technology area (CPC —)General
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.