Blade for high-performance shrouded propeller, multi-blade shrouded propeller provided with such blades and tail rotor arrangement with shrouded propeller for rotary wing aircraft
US4927331A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 28, 1989 |
| Grant date | May 22, 1990 |
| Priority date | — |
| Expiry date | Feb 28, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S416/05
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
This invention relates to a blade for shrouded propeller, wherein: in plan, its aerodynamically active part presents a rectangular shape; and the maximum relative camber of the successive profiles constituting the aerodynamically active part of the blade increases from a value close to 0 to a value close to 0.04; the twist of the aerodynamically active part of the blade decreases from a first value close to 12.degree. to a second value close to 4.degree., then increases to a third value close to 4.5.degree.; and the maximum relative thickness of said successive profiles decreases from a value close to 13.5% to a value close to 9.5%.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.