The three-blade main rotor is mounted above centre of fuselage.

在机身中心上面安装一个三浆叶主螺旋桨。

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The helicopter has a five-blade main rotor and a four-blade tail rotor.

直升飞机有一个五浆叶主旋翼和一个四浆叶尾旋翼。

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Additionally walking into the tail rotor or main rotor is a safety concern for bystanders.

此外走进尾桨或主旋翼是一个安全关切的旁观者。

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The x3 has a five-bladed main rotor and a pair of propellers on two short wings.

ECONOMIST: Chop, chop

This means it can hover like a helicopter, but when flying forwards can reduce the speed of the main rotor and let the wings provide part of the lift.

ECONOMIST: Chop, chop

It included the black box flight recorder, the fuselage with the engines and rotor gearbox attached, the separated rotor head with the main rotor blades still attached, and the separated tail.

BBC: Crash report urges safety checks