Helicopter having rotors equipped with flaps
US5255871A · kind A · utility
Inventor
Key dates
| Filing date | Apr 8, 1993 |
| Grant date | Oct 26, 1993 |
| Priority date | — |
| Expiry date | Apr 8, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T50/30
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A helicopter comprises a pair of rotors each having a flap hinged to one of its edges, a seesaw rod swingably supported above the rotors, a pair of auxiliary wings fixed to opposite ends of the seesaw rod, and a pair of connecting rods each connecting one of the flaps with seesaw rod above it. When the lift produced by one of the rotors becomes larger than that produced by the other, the auxiliary wing located above the rotor producing the larger lift rises and turns up the flap of the rotor to reduce its flap effect and decrease the rotor lift, while the auxiliary wing located above the rotor producing the smaller lift lowers and turns down the flap of the rotor to increase its flap effect and raise its lift. As a result, the lifts of the two rotors are regulated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.