Which one among the following is successfully tested in Germany recent

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Which one among the following is successfully tested in Germany recently as world’s first green helicopter which is environment friendly and emission free ?

Volocopter
Sikorsky
Eurocopter
Bell
This question was previously asked in
UPSC CAPF – 2014
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In late 2013, the German company E-volo successfully conducted manned test flights of its prototype electric multirotor aircraft, the Volocopter VC200. This aircraft was widely reported at the time as being the world’s first certified electric multirotor (often referred to in popular media as an electric helicopter, though technically a multirotor VTOL aircraft) and was highlighted for being emission-free and environmentally friendly.
The Volocopter is an electric vertical take-off and landing (eVTOL) aircraft, representing a new class of environmentally friendly rotorcraft as opposed to traditional fuel-powered helicopters.
Sikorsky, Eurocopter (now Airbus Helicopters), and Bell are established manufacturers of traditional helicopters powered by jet engines, although they are also developing hybrid and electric models more recently. The question specifically refers to a successful test of a “first green helicopter” in Germany around Dec 2013, which aligns with the Volocopter’s milestone flight.

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