It's been quite a month for electric aircraft. First, the Solar Impulse 2 broke distance and duration records when it flew from Japan to Hawaii. Then, two competing teams both claimed to have made the world's first electric flight across the English Channel. Now, Germany's PC-Aero says that its Elektra One Solar has become the first solar-electric plane to cross the Alps in both directions.
According to the company, the single-person ultralight aircraft took off from the German municipality of Unterwössen on June 25th, crossed over the Grossglockner (the highest mountain in Austria), and proceeded to land in the Austrian town of Lienz. The whole flight took 2.5 hours.
On July 2nd, it flew back across the mountain range, facing strong headwinds and gusts. Climbing to an altitude of over 3,000 m (9,843 ft) and traveling 190 km (118 miles), it reached the Austrian town of Zell am See within two hours. The aircraft's stated range is 500 km (311 miles) or five hours.
One of five of its kind, the 180-kg (397-lb) Elektra One Solar was equipped with 280 solar cells on its upper wing surface, which provided about 30 percent of the electricity it required to fly. The rest came from its pre-charged 11.5-kWh lithium-ion battery pack. It has a continuous engine power of 16 kW, and can carry a maximum payload of 100 kg (220 lb) at a cruising speed of 100 km/h (62 mph).
For this trip, it was additionally equipped with a 3D landscape mapping camera.
PC-Aero also manufactures a non-solar (but still electric) version of the Elektra One, and is working on models that will seat multiple passengers.
Source: PC-Aero
I find the Canal crossing a lot more meaningful for electric flight.
With state of the art cells can generate ~200W sq/m. The data on the manufacturer's website states: "6 square meter solar cells on the wing surface provide more than 1 kW power for flying". In traditional aircraft terms, this is a rounding error of the power capable in a small ICE engine.
http://www.solar-flight.com/projects/sunseeker-ii/ http://www.fai.org/news/32736-solar-powered-sunseeker-ii-crosses-the-alps http://www.treehugger.com/aviation/breathtaking-first-crossing-of-the-alps-by-a-solar-plane.html
Eric Raymond's first flight over the Alps took approx. 5 hours and the distance flown was more than double of the distance of Electra One's both flights. Later in 2009 he made more crossings of the Alps in many directions.
[Ed. note: As mentioned in the article, PC-Aero's claim was specifically that its Elektra One Solar was the first solar-electric aircraft to cross the Alps "in both directions."]