Aerial propellors more especially for aircraft propulsive units
US4790724A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 7, 1987 |
| Grant date | Dec 13, 1988 |
| Priority date | — |
| Expiry date | Oct 7, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S416/02
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
The mean line (F) of each blade (1) is formed by a flat continuous curve contained in a plane OZ-OY.sub.o forming with the plane of rotation of the propeller an angle .phi..sub.o between 35.degree. and 55.degree. and preferably between 40.degree. and 50.degree., said curve having a first part of negative Y.sub.o and positive Z coordinates, and a second part of positive Y.sub.o and positive Z coordinates, the coordinate point Y.sub.o =0 being situated between the values of Z included between 0.75 and 0.85 R (R designating the radius of the propeller), the tangent to this curve has its end corresponding to the end of the blade forming with the axis Oz an angle between 30.degree. and 50.degree. and preferably between 35.degree. and 45.degree..
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.