Solar Impulse leaves Dallas for St Louis in trans-America bid

[mhm]

A solar-powered plane aiming to cross the US from the West Coast to the East Coast has begun its third leg.

This will take the Solar Impulse vehicle from Dallas to St Louis in a flight expected to last 21 hours.

The HB-SIA craft, which has the same wingspan as an Airbus A340 but weighs just 1.6t, took off from Dallas Fort Worth at 04:06 local time (09:06 GMT).

It is due to land at Lambert-St Louis International Airport at about 01:00 local time on Tuesday (06:00 GMT).
http://www.bbc.co.uk/news/science-environment-22754126