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Its trademark technique was to craft them with curves that fit snugly into the contours of each car.
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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.
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In her workshop at the Limerick Craft Hub, she showed me how the technique just involves a strip of silk, some lengths of spun wool, some water and a couple of hand sanders.
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