Solar Impulse can fly day and night on solar energy and without fuel.It can fly at a speed of 69 km per hour, but it can not fly in strong wind, cloud,fog , rain bad weather etc because of its wing span and low weight ( as much as that of car)
read more http://www.hindustantimes.com/world-news/NorthAmerica/Solar-powered-plane-wraps-first-leg-of-flight-across-United-States/Article1-1055134.aspx
read more http://www.hindustantimes.com/world-news/NorthAmerica/Solar-powered-plane-wraps-first-leg-of-flight-across-United-States/Article1-1055134.aspx
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