Energy comes in different forms. Light is a form of energy. Sun is source of energy called “sunlight”. Sunshine is free and never gets used up. Also, there is a lot of it. The sunlight that heats the Earth in an hour has more energy than the people of the world use in a year. A little device called a solar cell can make electricity right from sunlight. The dream of flight powered only by the sun’s energy or sunlight has long motivated scientists and hobbyists. A solar aircraft is one which collects energy from the sun by means of photovoltaic solar cells. The energy may be used to drive electric motor to power the aircraft. Such airplanes store excess solar energy in batteries for night use.
Also there are rapidly increasing traffic problems in world and in our country also, so it is required to go for such small solar aircrafts which can be used for transporting goods or materials between places at short distance.
Using solar panels there is more space due to escape of engines and turbines. Quite a few manned and unmanned solar aircraft have been developed and flown.