Conclusion The list of failed inventions could be extended at will Reinhold Bauer for instance mentions the huge wind turbine Growian the fast breeder reactor the Wankel engine or the Transrapid high speed monorail train But there are some current examples as well Bauer I tend to be depressed by futuristic anachronisms like the Volocopter with which in my opinion obsolete models of personal mobility the flying car are carried forward into the future of mobility for which we d actually need different more sustainable solutions Be that as it may one thing says Bauer is certain Failure rather than success is the rule when it comes to technical innovations The author While author Roland Löwisch has no personal history of technical failure he does have one in a classic sense His first thesis in business administration was rejected by the supervising professor as being too journalistic There could hardly be a nicer way to fail when you re aspiring to become an editor Flettner rotor The gentleman on the left is Anton Flettner In the 1920s he equips two ships with a novel type of wind powered drive the Flettner rotors that are named after him The upright mounted cylinders on deck are caused to rotate by an electric motor The energy applied there is magnified by the wind using the Magnus effect When the wind is blowing against the rotating cylinder the air on one side of the cylinder is swept along and flows faster On the other side where the surface faces the opposite direction of the wind the air flow is slowed down Like in the case of an aircraft wing this produces a vacuum on one side and overpressure on the other resulting in powerful thrust that s ten times stronger than in classic sailing Although Flettner s ships navigate the high seas for a few years oil subsequently gains traction as a fuel it s cheaper so the technology disappears Up until a few years ago In 2010 Enercon a German wind turbine manufacturer presents E Ship 1 below using Flettner column type rotors Four aluminum rotors assist the ship s engine Since 2014 Finnish rotor sail specialist Norsepower has been using lightweight rotors on several ships The costs are supposed to amortize after four to eight years The disadvantage of Flettner s idea of all the seagoing vessels the huge container ships where the rotors would make particular energetic sense can t use them because there s no space on deck Gone with the wind of electricity for the electric motors in Norsepower s lightweight Flettner rotors multiply into an equivalent of 3 MW of conventional propulsion force in good wind conditions according to the operator 90 kW 37 In motion

Vorschau Schaeffler tomorrow 02-2020 EN Seite 37
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