first untethered, fully electric manned helicopter flight

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sk8norcal   100 MW

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first untethered, fully electric manned helicopter flight

Post by sk8norcal » Sep 05 2011 8:10pm

Pascal Chretien

http://www.gizmag.com/first-successful- ... ght/19716/

http://www.pprune.org/rotorheads/462709 ... s-off.html
http://rotaryforum.com/forum/showthread.php?p=435913
The World’s first manned flight of a 100% electric powered helicopter was conducted on the 12th of August 2011, after 2 weeks of tethered flight tests. This machine, designed and test flown by Pascal Chretien, for the French based company Solution F, is the outcome of a remarkably short development period that was initiated in August 2010.

This ultra light coaxial helicopter weighs 170-Kg empty, including 60 Kg of high performance air-cooled Li-ion polymer batteries that can deliver 43 KW continuous, and 52 KW peak. The craft weighs 247-Kg at takeoff and offers 10 to 12 minutes flight time. To save weight, conventional cyclic and flight controls were replaced by a weight shifting system, as well as a specific design for rotor inertia, and blade pitch. Collective and yaw are achieved via electrical flight controls.

An advanced MOSFET based feather light drive train offers astounding 87.5% end to end efficiency, from batteries terminals to rotor mast.

This helicopter is a demonstrator intended to pave the way for hybrid rotary wing aircraft and is a test bed for new technologies. Flight envelope expansion is ongoing.

Hillhater   100 GW

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Re: first untethered, fully electric manned helicopter fligh

Post by Hillhater » Jun 25 2012 7:28pm

Sikorsky Firefly: An Electric Helicopter
http://www.youtube.com/watch?v=oD8TfjDM ... re=related
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sk8norcal   100 MW

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Re: first untethered, fully electric manned helicopter fligh

Post by sk8norcal » Jun 26 2012 3:14pm

In his 2 minute, 10 second test flight, Chretien beat aviation giant Sikorsky into the record books

Punx0r   10 GW

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Re: first untethered, fully electric manned helicopter fligh

Post by Punx0r » Jul 01 2012 3:31pm

Chretien chose brushed DC motors for the rotor shafts, even though the required power output was "just on the edge of what can be achieved with brushed motors" - because brushed motors are exceptionally efficient, and their simple controller units are significantly lighter than those of more powerful, less efficient brushless motors

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