Device for measurement of the speed of a helicopter
US4023409A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 15, 1975 |
| Grant date | May 17, 1977 |
| Priority date | — |
| Expiry date | Aug 15, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01P7/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Apparatus for measurement of the velocity of a helicopter with reference to the air comprises two measurement systems that are substantially identical, associated with a double indicator. The measurements are effected with reference to the longitudinal axis and the transverse axis of the helicopter. Each measurement system comprises a position detector for detecting the position of the cyclic rotor pitch command member along one axis, and a detector of the acceleration component along the same axis, with a substantially identical measurement system associated with the other axis. Computing means effect integration of the algebraic sum of the measured values, and pass signals to the double indicator which indicates velocity of the helicopter along the axes. The acceleration detectors include pendular levels, and all detectors incorporate measurement potentiometers. The apparatus is especially useful in the measurement of the air speed of a helicopter close to hovering conditions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.