Helicopter rotor blade
US4668169A · kind A · utility
15Cited by
2References
13Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 19, 1984 |
| Grant date | May 26, 1987 |
| Priority date | — |
| Expiry date | Jun 19, 2004 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB64C27/46
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
An outboard region of a helicopter rotor blade of aerofoil cross section has a thickness to chord ratio not greater than twelve percent and an inboard region has a thickness to chord ratio greater than twelve percent. Preferably, the thickness to chord ratio of the inboard region is greater than eighteen percent and may increase towards the root end to about twenty four percent. The inboard region may extend outwardly to a position not exceeding sixty percent of an operating radius of the rotor blade.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.