Add a Dimension to Your Analysis of the Helicopter Low Airspeed Environment
Abstract
We have long strived to better define the low airspeed relative wind limits of the helicopter and also to define the helicopter performance in a 3- dimensional (3-D) format. These concepts were first presented in an AHS paper in 1977 also published as NAVAIRTESTCEN Technical Memorandum TM 77-2 RW of 29 April 1977. Recent analysis of the low airspeed environment for purposes of defining deficiencies and evaluating an Unanticipated Right Yaw (URY) or Loss of Tail Rotor Effectiveness (LTE) problem have developed a new method of reducing and presenting critical azimuth test data. A new method of reducing test data was presented to the Society of Flight Test Engineers in a 1992 paper and involved the automatic handling of test data along with including the oscillatory component of the trim point. In our opinion, presentation formats were more logical than the classical methods of presentation of critical azimuth data, but they were still presented in a 2-dimensional (2-D) format. Dispersion data on the plot gave indications of the third dimension of workload as has been presented by the Army in their reports, but still on a 2-D plot. The location of interference effects could be determined by looking at six or seven 2-D plots of the type presented in the prior paper
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1994
- Accession Number
- ADA283982
Entities
People
- Herman Kolwey
Organizations
- Naval Air Warfare Center