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Statements

Subject Item
dbr:Counter-rotating_propellers
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rdfs:label
Motroterande motorer Counter-rotating propellers 反向旋转螺旋桨
rdfs:comment
反向旋转螺旋桨（Counter-rotating propellers），也称对转螺旋桨，常见于双引擎或者多引擎的固定翼飞机，指的是其两侧的螺旋桨转动的角速度方向相反。 大多数传统的螺旋桨飞机，其两侧的螺旋桨转动的方向其实是相反的。通常情况下，如果从飞行员座舱往前看去，左手侧螺旋桨为顺时针转动、右手侧为逆时针转动，也即在上半圈往里转。反向旋转螺旋的设计目的是要减少螺旋桨的扭矩和（P-因子）对飞机稳定性的影响。 有个别的飞机制造商生产出一类特殊的反向旋转螺旋桨，其左右的转动方向与普通的飞机均相反，因此两侧的螺旋桨叶片均在上半圈往外转、下半圈往里转。这种设计最早使用在P-38闪电式战斗机上，目的是为了增加机鼻机炮的精准度。除此以外，二战时德国的亨舍尔Hs 129攻击机，亨克尔He 177轰炸机以及梅塞希密特Me 323运输机均采用了这种独特的设计。 Counter-rotating propellers, also referred to as CRP, are propellers which spin in opposite directions to each other. They are used on some twin- and multi-engine propeller-driven aircraft. The propellers on most conventional twin-engined aircraft spin clockwise (as viewed from behind the engine). Counter-rotating propellers generally spin clockwise on the left engine and counter-clockwise on the right. The advantage of such designs is that counter-rotating propellers balance the effects of torque and P-factor, meaning that such aircraft do not have a critical engine in the case of engine failure.
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dbo:abstract
Counter-rotating propellers, also referred to as CRP, are propellers which spin in opposite directions to each other. They are used on some twin- and multi-engine propeller-driven aircraft. The propellers on most conventional twin-engined aircraft spin clockwise (as viewed from behind the engine). Counter-rotating propellers generally spin clockwise on the left engine and counter-clockwise on the right. The advantage of such designs is that counter-rotating propellers balance the effects of torque and P-factor, meaning that such aircraft do not have a critical engine in the case of engine failure. Drawbacks of counter-rotating propellers come from the fact that, in order to reverse the rotation of one propeller, either one propeller must have an additional reversing gearbox, or the engines themselves must be adapted to turn in opposite directions. (Meaning that there are essentially two engine designs, one with left-turning and the other with right-turning parts, which complicates manufacture and maintenance.) 反向旋转螺旋桨（Counter-rotating propellers），也称对转螺旋桨，常见于双引擎或者多引擎的固定翼飞机，指的是其两侧的螺旋桨转动的角速度方向相反。 大多数传统的螺旋桨飞机，其两侧的螺旋桨转动的方向其实是相反的。通常情况下，如果从飞行员座舱往前看去，左手侧螺旋桨为顺时针转动、右手侧为逆时针转动，也即在上半圈往里转。反向旋转螺旋的设计目的是要减少螺旋桨的扭矩和（P-因子）对飞机稳定性的影响。 有个别的飞机制造商生产出一类特殊的反向旋转螺旋桨，其左右的转动方向与普通的飞机均相反，因此两侧的螺旋桨叶片均在上半圈往外转、下半圈往里转。这种设计最早使用在P-38闪电式战斗机上，目的是为了增加机鼻机炮的精准度。除此以外，二战时德国的亨舍尔Hs 129攻击机，亨克尔He 177轰炸机以及梅塞希密特Me 323运输机均采用了这种独特的设计。
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