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 propeller is usually mounted on a mast behind the pilot and raised for take-off (or to gain more height or distance once airborne) and then lowered back inside the fuselage.