Unlike the blades on old-fashioned propeller engines, these blades spin around at the back of the engine.

与老式螺旋桨发动机的叶片不同，这些叶片在发动机的后部旋转。

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The trouble was that at high altitudes where there is less oxygen, the propeller blades had little air to bite and engines still needed oxygen to burn petrol.

麻烦的是，高海拔的地段，氧气稀薄，螺旋桨叶片没有空气使其扇动，而且发动机燃烧汽油也需要氧气。

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All Marine engines could be sold with gearbox, and some engines could be sold with tail shaft and propeller.

全系列产品均可以匹配齿轮箱销售，部分机型可以连带尾轴，螺旋桨销售。

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Unlike the blades on old-fashioned propeller engines, these blades spin around at the back of the engine.

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It was overhauled last summer, when its original, water-jet propulsion engines were replaced with two inboard propeller engines.

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Originally a manufacturer of steam engines and propeller wheels, the company turned to shipbuilding and eventually sold everything from steel to cabinets and benches.

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