培训期间，威廉学习了高速螺旋桨飞机和直升机驾驶技术等课程。
William learnt how to fly fast propeller-powered planes and helicopters during the four-month RAF training.(See photo)
美国西科斯基公司的X2拥有一部安装在后方的推进螺旋桨，这使它获得高速的前飞速度。
The Sikorsky X2 has a pusher propeller mounted at the rear to obtain its high forward speed.
除了扮演传统直升机角色外，还具有涡轮螺旋桨飞机的长距离、高速巡航性能。
It is designed to perform conventional helicopter missions but with the long-range, high-speed cruise performance of a turboprop aircraft.
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