希勒HJ-1大黄蜂 - 照片和视频

这 希勒YH-32大黄蜂 (company designation HJ-1) was an American ultralight helicopter built by Hiller Aircraft in the early 1950s. It was a small and unique design because it was powered by two Hiller 8RJ2B ramjet engines mounted on the rotor blade tips which weigh 13lbs each and deliver an equivalent of 45 h.p. for a total of 90 h.p. Versions of the HJ-1 Hornet were built for the United States Army and the United States Navy in the early 1950s. The Hiller Museum identifies the YH-32A, named the Sally Rand, as the first helicopter gunship.

源： 维基百科上的希勒 HJ-1 大黄蜂

希勒HJ-1大黄蜂是希勒飞机公司在1940年代后期开发的实验直升机。它由安装在旋翼尖端的两个冲压发动机提供动力，这消除了对尾桨的需求并降低了机身上的扭矩。HJ-1旨在测试直升机尖端喷气推进的可行性和性能，以及探索低速空气动力学和稳定性问题。
HJ-1于1948年首飞，最高时速为90英里/小时，天花板为10，000英尺。然而，尖端喷射系统有几个缺点，例如高油耗、噪音、振动和控制权限有限。HJ-1也容易出现发动机故障和转子叶片侵蚀。该项目在1950年被取消，因为只建造和测试了两个原型。HJ-1“大黄蜂”是最早的尖端喷气直升机之一，后来被Sud Aviation和Fairey Aviation等其他制造商使用。