Pitcairn XO-61(公司型号PA-44和合约名称MX-157[1])是一款由皮特凯恩飞机公司 设计的自转旋翼机。作为最后生产的旋翼机之一,在与奇力 YO-60和R-4直升机的竞争中,它因后置发动机的冷却问题以及具有悬停能力的直升机的出现而落选。[2][3]
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