This research was conducted to investigate the required visual cueing for low speed and hover and to determine if an increase in stabilization can effectively be used to compensate for the loss of essential cues. Two flight test experiments were conducted using a conventional helicopter and a variable stability helicopter, as well as electronically fogged lenses and night vision goggles with daylight training filters. The primary conclusion regarding the essential cues for hover was that fine grained texture is more important than large discrete objects or field of view. The use of attitude command augmentation was found to be effective as a way to make up for display deficiencies. However, a corresponding loss of agility occurred with the tested attitude command/attitude hold system resulting in unfavorable pilot comments. Hence, the favorable control display tradeoff must be interpreted in the context that the best solution would be to improve the vision aid. Such an improvement would require an increase in the visual microtexture, an advancement in display technology that is unlikely to be available in the foreseeable future. Therefore, a criterion was developed to systematically evaluate display quality and the associated upgrade in required stabilization as a function of increasingly degraded visual cues.
Handling Qualities Criterion for Very Low Visibility Rotorcraft
1987
15 pages
Report
Keine Angabe
Englisch
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