In a helicopter the articulated head and tail rotor gearbox are required to be a very high specification design using the best materials and requiring frequent and costly maintenance.
在直升机的阐述头和尾桨变速箱都必须是一个非常高规格的设计使用最好的材料和需要频繁和昂贵的维修。
2
The durable semi-enclosed tail rotor gearbox protects the tail rotor gears while at the same time allowing easy inspection.
耐用半封闭式尾桨变速箱保护尾桨齿轮同时也可以很容易地查阅。
3
All Marine engines could be sold with gearbox, and some engines could be sold with tail shaft and propeller.