Chief flight instructor Mark C. W. Robinson, with Revolution Aviation, shows off an AscTec Hummingbird.  In Robinson's right hand he holds the battery, which allows up to 22 minutes of power, and the charger in his left hand.

( KEVIN CHANG, Daily Pilot / May 20, 2014 )

Chief flight instructor Mark C. W. Robinson, with Revolution Aviation, shows off an AscTec Hummingbird. In Robinson's right hand he holds the battery, which allows up to 22 minutes of power, and the charger in his left hand.

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