Shroud geometry for unmanned aerial vehicles
US5150857A · kind A · utility
86Cited by
9References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 13, 1991 |
| Grant date | Sep 29, 1992 |
| Priority date | — |
| Expiry date | Aug 13, 2011 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB64U50/11
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
An unmanned aerial vehicle having a toroidal fuselage that surrounds a pair of coaxial, multi-bladed, counter-rotating rotors. The toroidal fuselage has an airfoil profile that is optimized to provide high hover efficiency and produce a pressure distribution that provide high lift forces. The airfoil profile is further optimized to counteract the undesirable nose-up pitching moments experienced by ducted rotary-type UAVs in forward translational flight.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.