Solar Powered Airplane.

With the wingspan of a jumbo jet and the weight of a small car, the Solar Impulse is a test model for a more advanced aircraft.

A solar-powered airplane that developers hope to eventually pilot around the world took off from San Francisco Bay on the first leg of an attempt to fly across the United States with no fuel but the sun's energy.

The plane, dubbed the Solar Impulse, departed shortly after 6 a.m. local time from Moffett Field, a joint civil-military airport near the south end of San Francisco, heading first to Phoenix on a slow-speed flight expected to take 15 to 20 hours.

The spindly looking plane barely hummed as it took flight in the still northern California morning as the sun was just beginning to peek out over the Santa Cruz Mountains to the east.

Swiss pilots and co-founders of the project, Bertrand Piccard and Andre Borschberg, will take turns flying the plane, built with a single-seat cockpit, with Piccard at the controls for the first flight to Arizona.

The project began in 2003 with a 10-year budget of 90 million euros and has involved engineers from Swiss escalator maker Schindler and research aid from Belgian chemicals group Solvay - backers who want to test new materials and technologies while also gaining brand recognition.

With the wingspan of a jumbo jet and the weight of a small car, the Solar Impulse is a test model for a more advanced aircraft the team plans to build to circumnavigate the globe in 2015.

The aircraft runs on about the same power as a motor scooter, propelled by energy collected from 12,000 solar cells built into the wings that simultaneously recharge batteries with a storage capacity equivalent to a Tesla electric car.

The plane, which from a distance resembles a giant floating insect in the sky, is unlikely to set any speed or altitude records. It can climb gradually to 28,000 feet (8,500 meters) and flies at an average pace of just 43 miles per hour (69 km per hour).

The current plane was designed for flights of up to 24 hours at a time, but the next model will have to allow for up to five days and five nights of flying by one pilot - a feat not yet accomplished.

The plane's four large batteries, attached to the bottom of the wings along with the plane's tiny motors, account for a quarter of its overall heft. The aircraft's lightweight carbon fiber design and wingspan allow it to conserve energy, but also make the plane vulnerable to being tipped over.

Source: Yahoo!

1. A solar-powered airplane that developers hope to eventually pilot around the world took off from San Francisco Bay on the first leg of an attempt to fly across the United States with no fuel but the sun's energy.

2. The plane, dubbed the Solar Impulse, departed shortly after 6 a.m. local time from Moffett Field, a joint civil-military airport near the south end of San Francisco, heading first to Phoenix on a slow-speed flight expected to take 15 to 20 hours.

3. The spindly looking plane barely hummed as it took flight in the still northern California morning as the sun was just beginning to peek out over the Santa Cruz Mountains to the east.

4. Swiss pilots and co-founders of the project, Bertrand Piccard and Andre Borschberg, will take turns flying the plane, built with a single-seat cockpit, with Piccard at the controls for the first flight to Arizona.

5. The project began in 2003 with a 10-year budget of 90 million euros and has involved engineers from Swiss escalator maker Schindler and research aid from Belgian chemicals group Solvay - backers who want to test new materials and technologies while also gaining brand recognition.

6. With the wingspan of a jumbo jet and the weight of a small car, the Solar Impulse is a test model for a more advanced aircraft the team plans to build to circumnavigate the globe in 2015.

7. The aircraft runs on about the same power as a motor scooter, propelled by energy collected from 12,000 solar cells built into the wings that simultaneously recharge batteries with a storage capacity equivalent to a Tesla electric car.

8. In that way, the Solar Impulse can fly after dark on solar energy generated during daylight hours, and will become the first solar-powered aircraft capable of operating day and night without fuel to attempt a US coast-to-coast flight.

9. But the plane, which from a distance resembles a giant floating insect in the sky, is unlikely to set any speed or altitude records. It can climb gradually to 28,000 feet (8,500 meters) and flies at an average pace of just 43 miles per hour (69 km per hour).

10. The current plane was designed for flights of up to 24 hours at a time, but the next model will have to allow for up to five days and five nights of flying by one pilot - a feat not yet accomplished.

11. The plane's four large batteries, attached to the bottom of the wings along with the plane's tiny motors, account for a quarter of its overall heft. The aircraft's lightweight carbon fiber design and wingspan allow it to conserve energy, but also make the plane vulnerable to being tipped over.

1. A solar-powered airplane that developers hope to eventually pilot around the world took off from San Francisco Bay on the first leg of an attempt to fly across the United States with no fuel but the sun's energy.

2. The plane, dubbed the Solar Impulse, departed shortly after 6 a.m. local time from Moffett Field, a joint civil-military airport near the south end of San Francisco, heading first to Phoenix on a slow-speed flight expected to take 15 to 20 hours.

3. The spindly looking plane barely hummed as it took flight in the still northern California morning as the sun was just beginning to peek out over the Santa Cruz Mountains to the east.

4. Swiss pilots and co-founders of the project, Bertrand Piccard and Andre Borschberg, will take turns flying the plane, built with a single-seat cockpit, with Piccard at the controls for the first flight to Arizona.

5. The project began in 2003 with a 10-year budget of 90 million euros and has involved engineers from Swiss escalator maker Schindler and research aid from Belgian chemicals group Solvay - backers who want to test new materials and technologies while also gaining brand recognition.

6. With the wingspan of a jumbo jet and the weight of a small car, the Solar Impulse is a test model for a more advanced aircraft the team plans to build to circumnavigate the globe in 2015.

7. The aircraft runs on about the same power as a motor scooter, propelled by energy collected from 12,000 solar cells built into the wings that simultaneously recharge batteries with a storage capacity equivalent to a Tesla electric car.

8. In that way, the Solar Impulse can fly after dark on solar energy generated during daylight hours, and will become the first solar-powered aircraft capable of operating day and night without fuel to attempt a US coast-to-coast flight.

9. But the plane, which from a distance resembles a giant floating insect in the sky, is unlikely to set any speed or altitude records. It can climb gradually to 28,000 feet (8,500 meters) and flies at an average pace of just 43 miles per hour (69 km per hour).

1. A solar-powered airplane that developers hope to eventually pilot around the world took off from San Francisco Bay on the first leg of an attempt to fly across the United States with no fuel but the sun's energy.

2. The plane, dubbed the Solar Impulse, departed shortly after 6 a.m. local time from Moffett Field, a joint civil-military airport near the south end of San Francisco, heading first to Phoenix on a slow-speed flight expected to take 15 to 20 hours.

3. The spindly looking plane barely hummed as it took flight in the still northern California morning as the sun was just beginning to peek out over the Santa Cruz Mountains to the east.

4. Swiss pilots and co-founders of the project, Bertrand Piccard and Andre Borschberg, will take turns flying the plane, built with a single-seat cockpit, with Piccard at the controls for the first flight to Arizona.

5. The project began in 2003 with a 10-year budget of 90 million euros and has involved engineers from Swiss escalator maker Schindler and research aid from Belgian chemicals group Solvay - backers who want to test new materials and technologies while also gaining brand recognition.

6. With the wingspan of a jumbo jet and the weight of a small car, the Solar Impulse is a test model for a more advanced aircraft the team plans to build to circumnavigate the globe in 2015.

7. The aircraft runs on about the same power as a motor scooter, propelled by energy collected from 12,000 solar cells built into the wings that simultaneously recharge batteries with a storage capacity equivalent to a Tesla electric car.

8. In that way, the Solar Impulse can fly after dark on solar energy generated during daylight hours, and will become the first solar-powered aircraft capable of operating day and night without fuel to attempt a US coast-to-coast flight.

9. But the plane, which from a distance resembles a giant floating insect in the sky, is unlikely to set any speed or altitude records. It can climb gradually to 28,000 feet (8,500 meters) and flies at an average pace of just 43 miles per hour (69 km per hour).

1. A solar-powered airplane that developers hope to eventually pilot around the world took off from San Francisco Bay on the first leg of an attempt to fly across the United States with no fuel but the sun's energy.

2. The plane, dubbed the Solar Impulse, departed shortly after 6 a.m. local time from Moffett Field, a joint civil-military airport near the south end of San Francisco, heading first to Phoenix on a slow-speed flight expected to take 15 to 20 hours.

3. The spindly looking plane barely hummed as it took flight in the still northern California morning as the sun was just beginning to peek out over the Santa Cruz Mountains to the east.

4. Swiss pilots and co-founders of the project, Bertrand Piccard and Andre Borschberg, will take turns flying the plane, built with a single-seat cockpit, with Piccard at the controls for the first flight to Arizona.

5. The project began in 2003 with a 10-year budget of 90 million euros and has involved engineers from Swiss escalator maker Schindler and research aid from Belgian chemicals group Solvay - backers who want to test new materials and technologies while also gaining brand recognition.

6. With the wingspan of a jumbo jet and the weight of a small car, the Solar Impulse is a test model for a more advanced aircraft the team plans to build to circumnavigate the globe in 2015.

7. The aircraft runs on about the same power as a motor scooter, propelled by energy collected from 12,000 solar cells built into the wings that simultaneously recharge batteries with a storage capacity equivalent to a Tesla electric car.

8. In that way, the Solar Impulse can fly after dark on solar energy generated during daylight hours, and will become the first solar-powered aircraft capable of operating day and night without fuel to attempt a US coast-to-coast flight.

9. But the plane, which from a distance resembles a giant floating insect in the sky, is unlikely to set any speed or altitude records. It can climb gradually to 28,000 feet (8,500 meters) and flies at an average pace of just 43 miles per hour (69 km per hour).

1. A solar-powered airplane that developers hope to eventually pilot around the world took off from San Francisco Bay on the first leg of an attempt to fly across the United States with no fuel but the sun's energy.

2. The plane, dubbed the Solar Impulse, departed shortly after 6 a.m. local time from Moffett Field, a joint civil-military airport near the south end of San Francisco, heading first to Phoenix on a slow-speed flight expected to take 15 to 20 hours.

3. The spindly looking plane barely hummed as it took flight in the still northern California morning as the sun was just beginning to peek out over the Santa Cruz Mountains to the east.

4. Swiss pilots and co-founders of the project, Bertrand Piccard and Andre Borschberg, will take turns flying the plane, built with a single-seat cockpit, with Piccard at the controls for the first flight to Arizona.

5. The project began in 2003 with a 10-year budget of 90 million euros and has involved engineers from Swiss escalator maker Schindler and research aid from Belgian chemicals group Solvay - backers who want to test new materials and technologies while also gaining brand recognition.

6. With the wingspan of a jumbo jet and the weight of a small car, the Solar Impulse is a test model for a more advanced aircraft the team plans to build to circumnavigate the globe in 2015.

7. The aircraft runs on about the same power as a motor scooter, propelled by energy collected from 12,000 solar cells built into the wings that simultaneously recharge batteries with a storage capacity equivalent to a Tesla electric car.

8. In that way, the Solar Impulse can fly after dark on solar energy generated during daylight hours, and will become the first solar-powered aircraft capable of operating day and night without fuel to attempt a US coast-to-coast flight.

9. But the plane, which from a distance resembles a giant floating insect in the sky, is unlikely to set any speed or altitude records. It can climb gradually to 28,000 feet (8,500 meters) and flies at an average pace of just 43 miles per hour (69 km per hour).

   1. A solar-powered airplane that developers hope to eventually pilot around the world took off from San Francisco Bay on the first leg of an attempt to fly across the United States with no fuel but the sun's energy.

   2. The plane, dubbed the Solar Impulse, departed shortly after 6 a.m. local time from Moffett Field, a joint civil-military airport near the south end of San Francisco, heading first to Phoenix on a slow-speed flight expected to take 15 to 20 hours.

   3. The spindly looking plane barely hummed as it took flight in the still northern California morning as the sun was just beginning to peek out over the Santa Cruz Mountains to the east.

   4. Swiss pilots and co-founders of the project, Bertrand Piccard and Andre Borschberg, will take turns flying the plane, built with a single-seat cockpit, with Piccard at the controls for the first flight to Arizona.

   5. The project began in 2003 with a 10-year budget of 90 million euros and has involved engineers from Swiss escalator maker Schindler and research aid from Belgian chemicals group Solvay - backers who want to test new materials and technologies while also gaining brand recognition.

   6. With the wingspan of a jumbo jet and the weight of a small car, the Solar Impulse is a test model for a more advanced aircraft the team plans to build to circumnavigate the globe in 2015.

   7. The aircraft runs on about the same power as a motor scooter, propelled by energy collected from 12,000 solar cells built into the wings that simultaneously recharge batteries with a storage capacity equivalent to a Tesla electric car.

   8. In that way, the Solar Impulse can fly after dark on solar energy generated during daylight hours, and will become the first solar-powered aircraft capable of operating day and night without fuel to attempt a US coast-to-coast flight.

   9. But the plane, which from a distance resembles a giant floating insect in the sky, is unlikely to set any speed or altitude records. It can climb gradually to 28,000 feet (8,500 meters) and flies at an average pace of just 43 miles per hour (69 km per hour).

1. A solar-powered airplane that developers hope to eventually pilot around the world took off from San Francisco Bay on the first leg of an attempt to fly across the United States with no fuel but the sun's energy.

2. The plane, dubbed the Solar Impulse, departed shortly after 6 a.m. local time from Moffett Field, a joint civil-military airport near the south end of San Francisco, heading first to Phoenix on a slow-speed flight expected to take 15 to 20 hours.

3. The spindly looking plane barely hummed as it took flight in the still northern California morning as the sun was just beginning to peek out over the Santa Cruz Mountains to the east.

4. Swiss pilots and co-founders of the project, Bertrand Piccard and Andre Borschberg, will take turns flying the plane, built with a single-seat cockpit, with Piccard at the controls for the first flight to Arizona.

5. The project began in 2003 with a 10-year budget of 90 million euros and has involved engineers from Swiss escalator maker Schindler and research aid from Belgian chemicals group Solvay - backers who want to test new materials and technologies while also gaining brand recognition.

6. With the wingspan of a jumbo jet and the weight of a small car, the Solar Impulse is a test model for a more advanced aircraft the team plans to build to circumnavigate the globe in 2015.

7. The aircraft runs on about the same power as a motor scooter, propelled by energy collected from 12,000 solar cells built into the wings that simultaneously recharge batteries with a storage capacity equivalent to a Tesla electric car.

8. In that way, the Solar Impulse can fly after dark on solar energy generated during daylight hours, and will become the first solar-powered aircraft capable of operating day and night without fuel to attempt a US coast-to-coast flight.

9. But the plane, which from a distance resembles a giant floating insect in the sky, is unlikely to set any speed or altitude records. It can climb gradually to 28,000 feet (8,500 meters) and flies at an average pace of just 43 miles per hour (69 km per hour).

1. A solar-powered airplane that developers hope to eventually pilot around the world took off from San Francisco Bay on the first leg of an attempt to fly across the United States with no fuel but the sun's energy.

2. The plane, dubbed the Solar Impulse, departed shortly after 6 a.m. local time from Moffett Field, a joint civil-military airport near the south end of San Francisco, heading first to Phoenix on a slow-speed flight expected to take 15 to 20 hours.

3. The spindly looking plane barely hummed as it took flight in the still northern California morning as the sun was just beginning to peek out over the Santa Cruz Mountains to the east.

4. Swiss pilots and co-founders of the project, Bertrand Piccard and Andre Borschberg, will take turns flying the plane, built with a single-seat cockpit, with Piccard at the controls for the first flight to Arizona.

5. The project began in 2003 with a 10-year budget of 90 million euros and has involved engineers from Swiss escalator maker Schindler and research aid from Belgian chemicals group Solvay - backers who want to test new materials and technologies while also gaining brand recognition.

6. With the wingspan of a jumbo jet and the weight of a small car, the Solar Impulse is a test model for a more advanced aircraft the team plans to build to circumnavigate the globe in 2015.

7. The aircraft runs on about the same power as a motor scooter, propelled by energy collected from 12,000 solar cells built into the wings that simultaneously recharge batteries with a storage capacity equivalent to a Tesla electric car.

8. In that way, the Solar Impulse can fly after dark on solar energy generated during daylight hours, and will become the first solar-powered aircraft capable of operating day and night without fuel to attempt a US coast-to-coast flight.