They power a blade in the water that the pilot can adjust to reduce drag.

他们在水中为一个划片供能，因此驾驶者可以调整以降低拖力。

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To combat this, 'change a blade at the first sign that it starts to drag against the skin, ' said Dr Bunting.

为了防止此类现象，邦廷博士说“第一次出现开始划皮肤的迹象时就应该换刀片。”

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Increasing the lift drag ratio of turbine blade is an effective way for improving turbines aerodynamic characteristics.

提高叶轮机械叶片的升阻比，是改进叶轮机械气动性能的重要途径。

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Once the Roton has been slowed sufficiently by atmospheric drag, however, the pilot will change the blade-angles so that the blades are set spinning by the airflow, slowing the craft still further. (This technique, called auto-rotation, is used by helicopter pilots in emergency landings.) Small thrusters on the side of the Roton will stabilise it, so that it can be steered towards its landing site.

ECONOMIST: On a rotor-blade and a prayer | The