Pipistrel had a good week at Oshkosh. Shortly after its G4 placed ninth in the Dead Grass Awards, an indication of the number of spectators who tramped around the perimeter of the displayed aircraft, the company could announce the first test flight of the four-seat electric motorglider. “We are pleased to announce that after long and demanding work nearly of a nearly 30-member team of developers and constructors from Pipistrel’s R & D Institute the first 4-seat electric aircraft in the world took off this morning [August 12, 2011] at 7 AM local time.” Pipistrel overcame several difficulties in achieving this milestone. Developing the electric power system, the most powerful currently in an aircraft, and importing the 450 pounds of lithium-polymer batteries needed to energize it presented many issues. Perhaps the utterly new and unique design and the possibility of that many batteries self-igniting caused insurance companies to be more than normally cautious, although one did finally step forward. Because …