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AOPA's Air Safety Institute released its 24th annual Joseph T. Nall Report (PDF) this week, including for the first time a review of helicopter accident causes. Overall, accident rates for non-commercial fixed-wing aircraft climbed from 6.30 per 100,000 hours in 2010 to 6.54 in 2012 due to flight time decreasing while accident counts remained level in that period.
Offshore wind energy could add 4.2 million megawatts to the generating capacity of the U.S., according to the National Renewable Energy Laboratory, but the U.S. market has stalled almost completely, hindered by regulatory uncertainties, political opposition, litigation and a lack of available financing.
An engineering professor has developed a new highly efficient and low cost light emitting diode that could help spur more widespread adoption of the technology.
Researchers have wired four perovskite solar cells in series to enhance the voltage and directly photo-charged lithium batteries with 7.8% efficiency.