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Solar-powered plane takes off for flight across U.S.

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  • Solar-powered plane takes off for flight across U.S.

    Solar-powered plane takes off for flight across U.S.
    By Laila Kearney | May 3, 2013



    A solar-powered airplane that developers hope to eventually pilot around the world took off early on Friday 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.

    After additional stops in Dallas, St. Louis and Washington, D.C., with pauses at each destination to wait for favorable weather, the flight team hopes to conclude the plane's cross-country voyage in about two months at John F. Kennedy International Airport in New York. 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. He is tentatively scheduled to land in Phoenix at 1 a.m. local time on Saturday. The project began in 2003 with a 10-year budget of 90 million euros ($112 million) 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.

    Project organizers say the journey is also intended to boost worldwide support for the adoption of clean-energy technologies. "I hope people understand the potential of this technology and use it on the ground," Borschberg, who flew for the Swiss Air Force for more than 20 years, told reporters as Piccard suited up for the flight nearby. "If we don't try to fly today using renewable energy, we never will." 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 plane made its first intercontinental flight, from Spain to Morocco, last June. 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. 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 U.S. coast-to-coast flight. 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 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. Meditation and hypnosis were part of the training for the pilots as they prepared to fly on very little sleep.

    Asked about the downside of solar-powered flight at a news conference in March to unveil the current plane, Piccard acknowledged there was a price paid for the tiny carrying capacity and massive wings. "In that sense, it is not the easiest way to fly," he said. "But it is the most fabulous way to fly, because the more you fly, the more energy you have on board." He added: "We want to inspire as many people as possible to have that same spirit: to dare, to innovate, to invent." 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. A ground team of weather specialists, air traffic controllers and engineers track the plane's speed and battery levels and help the pilot steer clear of turbulence. Solar Impulse cannot fly in strong wind, fog, rain or clouds. Its machinery is not even designed to withstand moisture.
    Source: Reuters

    May the Sun always smile upon your journey's :)
    sigpic

  • #2
    I can see a great future for solar powered drones, especially if they can push the operating altitude up into the stratosphere. Their endurance would make then great substitutes for communication satellites and as platforms for non military scientific observation etc
    If you are emotionally invested in 'believing' something is true you have lost the ability to tell if it is true.

    Comment


    • #3
      "Project organizers say the journey is also intended to boost worldwide support for the adoption of clean-energy technologies."

      I don't condemn the development of this plane. But to insinuate it can even be remotely adapted for commercial purposes is idiocity to me. 69km/h on a wingspan of a jumbo jet and the weight of a small car?

      Comment


      • #4
        Still the thing can fly almost infinitely bar any mechanical/electrical breakdown, i can see some commercial use for that, or at least the iteration of the concept

        Comment


        • #5
          Originally posted by paintgun View Post
          Still the thing can fly almost infinitely bar any mechanical/electrical breakdown, i can see some commercial use for that, or at least the iteration of the concept
          With that kind of wingspan?

          Comment


          • #6
            SOLAR IMPULSE - AROUND THE WORLD IN A SOLAR AIRPLANE


            Final design: HB-SIA
            In November 2007, after four years of research and modeling,
            the Solar Impulse team presented the final design: with a 63.40
            meter wingspan and weighing 1,600 kg the aircraft would be
            the size of an Airbus A340 and the weight of a family car!
            Manufacturing of the first parts began. The prototype
            aircraft would carry the registration number HB-SIA
            Aircraft’s parts
            The Design and Structure team was responsible, among other
            things, for the aircraft’s parts. Every piece, from the largest to
            the smallest, was created specifically for the aircraft. The main
            objective was to combine strength and lightness so the best
            performing materials were selected. The skeleton of the 20m
            fuselage, consisting of the tail and the cockpit, is made of
            carbon fiber tubes. It was built by the Swiss company
            Décision, which also provided the essential building blocks of
            the wings. These are five hollow, rectangular beams. Placed
            end to end, they form the wing spar. 61m long, this is the
            most important piece of the entire structure, providing rigidity
            to the wing. It took 10 people and 8 months to produce, with
            60 heat treatments to give it homogeneity and resistance. The
            wing spar is formed of an internal honeycomb structure
            pressed between two layers of carbon fiber. This structure
            reproduces the cellular structure of honeycombs, ensuring
            very high resistance and maximum lightness.
            . For hours, the four
            engines powered by the solar generator propelled the
            aircraft to its maximum altitude, at an average speed of 23
            knots. At 6:43pm HB-SIA reached 28’608 feet or 8’720 m, an
            altitude at which the outside temperature sank to -20° C in
            the cockpit. Cold and fatigue were the only difficulties
            experienced by the pilot. Each stage of the mission was
            proceeding perfectly. After 14 ½ hours of flying, at 9:30pm,
            André Borschberg switched off the solar generator. A half
            hour later, the sun set and HB-SIA plunged into the night.

            Form airplane to glidder
            For more than four hours, the plane flew without any
            electricity, slowly gliding downwards. Such energy is called
            potential energy. The higher the plane climbs, the longer its
            descent. At the beginning of the night, however, HB-SIA lost
            altitude faster than expected. But thanks to the Mission
            team’s instructions, the pilot was able to avoid areas of
            down winds and extend his glide. Around midnight, the
            aircraft was at 4’500 feet, slightly less than 1’500 m, the
            altitude it needed to maintain until sunrise. André
            Borschberg then switched-on the battery power. The surplus
            electricity accumulated during the day now served to power
            the engines.

            Last hours before the sunrise
            During the hours that followed, the satisfaction of the
            mission team was growing. Indeed, HB-SIA was consuming
            less energy than expected. At 4:30am there was no longer
            any doubt that the plane had enough reserve energy left to
            fly until sunrise and beyond, until the solar generator could
            take over from the batteries and allow HB-SIA to regain
            altitude.

            Data from Solar Impulse Project[13] and Diaz[36]
            General characteristics

            Crew: 1
            Length: 21.85 m (71.7 ft)
            Wingspan: 63.4 m (208 ft)
            Height: 6.40 m (21.0 ft)
            Wing area: 11,628 photovoltaic cells rated at 45 kW peak: 200 m2 (2,200 sq ft)
            Loaded weight: 1,600 kg (3,500 lb)
            Max. takeoff weight: 2,000 kg (4,400 lb)
            Powerplant: 4 × electric motors, powered by 4 x 21 kWh lithium-ion batteries (450 kg), providing 7.5 kW (10 HP) each
            Take-off speed: 35 kilometres per hour (22 mph)
            Performance

            Cruise speed: 70 kilometres per hour (43 mph)
            Endurance: 36 hours (projected)
            Service ceiling: 8,500 m (27,900 ft) with a maximum altitude of 12,000 metres (39,000 ft)

            http://en.wikipedia.org/wiki/Solar_Impulse
            Last edited by USSWisconsin; 05 May 13,, 12:55.
            sigpic"If your plan is for one year, plant rice. If your plan is for ten years, plant trees.
            If your plan is for one hundred years, educate children."

            Comment


            • #7
              Originally posted by chanjyj View Post
              With that kind of wingspan?
              i think the idea is not to develop a payload capable plane, but more focus on ultra efficient lift/wing plus using clean and cheap energy

              as persistent ISR platform it does not have to carry a high payload
              and can loiter for days perhaps

              commercially? mapping and surveillance, forest fires or scientific missions
              like Monash said if you can push it over the weather system, in theory it can fly anywhere, 69 kph that is

              Comment


              • #8
                I cannot quote specifics, but ultra-long duration solar aircraft are being engineered that can act as temporary satellites, and do everything a satellite can, with the added advantage of being deployable anywhere in the world.

                Above a certain altitude, the weather is not a factor, and what winds exist tend to be fairly smooth. Using GPS, lithium batteries, and obviously solar cells, they can execute a pre-programmed orbit at an altitude that guarantees a known solar flux during the daylight hours. As paintgun says... On board, you can have various sensors, cameras, communications relays, etc.

                These things are definitely coming. I'm seeing more of a military application at first, but who knows what sort of commercial applications will follow?

                Comment


                • #9
                  Originally posted by paintgun View Post
                  Still the thing can fly almost infinitely bar any mechanical/electrical breakdown, i can see some commercial use for that, or at least the iteration of the concept
                  Such as high altitude communications array or advanced form of cell towers if no cell tower rights are to be had. It can circle endlessly for months. Also it would very useful for persistent deep penetration surveillance drones.

                  Comment


                  • #10
                    Lot of questions come to mind, to sum them...

                    What's the radar signature of this, and can it be shot down on that altitude?
                    No such thing as a good tax - Churchill

                    To make mistakes is human. To blame someone else for your mistake, is strategic.

                    Comment


                    • #11
                      I only guessing but I would assume that the radar signature of this type of aircraft will not be a major consideration. They are far to slow and cumbersome for military purposes in any kind of "hot" zone where both sides have even half decent air power. That said they would definitely be useful in counterinsurgency operations like Afghanistan and I can see heaps of uses for them by military and civilian organizations in other situations e.g the tsunami relief operations in Indonesia or the recent Australian military operations in East Timor and Bougainville. Imagine shipping in a disassembled solar powered drone in the back of heavy lift transport then reassembling it in place upon arrival. Once it's up and in the air you have could have your own mini "comsat" and/or wide area observation drone available 24/7 for weeks at a time.
                      Last edited by Monash; 06 May 13,, 13:42.
                      If you are emotionally invested in 'believing' something is true you have lost the ability to tell if it is true.

                      Comment


                      • #12
                        I concede your points, but I personally remain skeptical.

                        Comment


                        • #13
                          Originally posted by chanjyj View Post
                          I concede your points, but I personally remain skeptical.
                          You're not going to orbit one of these over Russia, China, the USA, or a handful of other major powers, if they don't want the presence there. But to shoot one down at 80,000+ feet (assuming these solar airplanes can get there) is not trivial.

                          If you read the story of the Powers' U-2 shoot-down (using SA-2/S-75 missiles), you'll find that the USSR salvo'd over a dozen missiles, shooting down one of their own fighters in the process, to get the U-2. Admittedly, we have a number of more modern and capable SAMs out there, but the technical challenge remains.

                          A military solar airplane is also capable of carrying ECM, and modern countermeasures can be very effective indeed.

                          Comment


                          • #14
                            You're probably more in-the-know than me so I won't comment. But from my POV I keep hearing this "renewable energy" chant and I have never seen anything productive come out of it.

                            Comment


                            • #15
                              All I was referring to is the ability to shoot down a solar plane that can orbit above 80,000 at 60 to 80 knots, nothing more. I think this particular solar airplane is just a publicity stunt, but there are some in development with real world applications.

                              Short of a nuclear airplane, a solar airplane is the only heavier than air device I can think of that can stay aloft indefinitely. And we all know what a variety of interesting payloads that can be carried these days.

                              I have never seen anything productive come out of it.
                              There are people all over the world with electrified homesteads that are completely off the grid using a combination of solar and wind. It's currently cheaper just to burn fuel and pay for electricity, but it can be done, and probably will be more so in the future.

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