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Handling qualities assessment of the effects of tail boom strakes on the Bell 412 helicopter

机译：对贝尔412直升机的尾架起落架效果的处理质量评估

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Flight tests were recently conducted at the National Research Council of Canada Flight Research Laboratory on the Bell 412 helicopter to evaluate the effects of the Boundary Layer Research tailboom strakes on aircraft handling qualities and control margins. Handling qualities were assessed using a selection of the standard hover/low speed manoeuvres from ADS-33, while control margins were examined by collecting trim position data at various low airspeeds and relative wind azimuths. The results indicated that the strakes offer a 0.5 to 1.0 Cooper-Harper handling qualities rating improvement for most manoeuvres, particularly with the stability augmentation system turned off. The strakes also improved the pedal margins resulting in the pilot using less left pedal when flying at low speed and reduced pedal activity at the critical relative wind azimuth.
机译：最近，加拿大国家研究委员会飞行研究实验室在贝尔412直升机上进行了飞行测试，以评估边界层研究尾梁对飞机操纵质量和控制余量的影响。通过选择ADS-33的标准悬停/低速操纵来评估操纵质量，同时通过在各种低空速和相对风向下收集配平位置数据来检查控制余量。结果表明，在大多数操作中，尤其是在稳定性增强系统关闭的情况下，这些板料可将Cooper-Harper的处理质量等级提高0.5至1.0。踏板还改善了踏板的裕度，导致飞行员在低速飞行时使用较少的左踏板，并在临界相对风向下减少了踏板活动。

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