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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Moshier, a former Navy-pilot-turned-entrepreneur, has spent the last five years of his life working secretly on a tiny twin blade strap helicopter called The Solotrek.

莫舍以前是一名海军的飞行员，如今他成了一名企业家。 他用了5年时间，一直在秘密研究一种小型的双叶直升机。

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The working system adopts hydraulic pilot operation. Blade is operated by hydraulic system.

单手柄液压先导操纵，铲刀动作全部为液压控制。

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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