常见的单旋翼-尾桨构型直升机只有一具主旋翼,直接从主轴驱动会对机身产生反作用扭矩,因此要加上尾桨进行平衡。二战时德国人发明了从旋翼翼尖喷出高速气体来推动旋翼的技术,这样理论上就不会产生反作用扭矩,可以去掉尾桨及其传动系统,既能减轻结构重量又可提高动力效率。不过这种翼尖喷气方式也存在技术难度高、油耗和噪声过大等先天缺陷,不止一个国家在这上面栽过跟头。 Common single rotor - tail rotor configuration helicopter only has one main rotor, the drive directly from the spindle will produce reaction torque on the fuselage, so to add tail rotor balance. During World War II, the German invented the technology of ejecting high-speed gas from rotor wingtip tip to propel the rotor. In theory, no reaction torque was generated and the tail rotor and its transmission system could be eliminated, so as to reduce the weight of the structure and improve the power efficiency. However, this wing tip jet also has technical difficulties, fuel consumption and noise is too large and other innate defects, more than one country planted above.