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Mobility Diary

    "Our greatest fear is not that we are inadequate, but that we are powerful beyond measure."

    Marianne Williamson
    from her book "A Return To Love"

    Mobility Diary

    Tag <Airplane>

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    Solar Powered Airplane: Solar Impulse
    last edited 2010/07/11 11:10 (*)

    In a century which brought a lot of invention about mobility, recent developments only pretend to be real innovations, but mostly refinements of existing ideas, concepts and realizations. Solar Impulse project around Bertrand Piccard is such a project.

    Solar Impulse Plans

    Solar Impulse (Illustration)

    Solar Impulse Test Flight

    General characteristics

    • Crew: 1
    • Payload: Lithium-ion batteries: 450 kg, (capacity: 200 Wh/kg = 90 KWh)
    • 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: 200 m2 (2,200 sq ft)
    • Loaded weight: 1600 kg (3,500 lb)
    • Max takeoff weight: 2000 kg (4,400 lb)
    • Powerplant: 4 electric motors, 7.5 kW (10 HP) each
    • Take-off speed: 35 kilometres per hour (22 mph)


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

    Wingspan Comparison of Solar Impulse vs Airbus 380

    The wingspan comparison and weight comparison shows the key of energy efficiency: weight. Regardless in air or surface, the weight is a major factor as pointed out in other postings here. To build a 1600kg airplane where the batteries already use up 25% of the weight reveals also the main problem: storing (electric) energy, and currently (2010) electricity is stored in batteries, and those still impose a high weight cost.

    I hope the research around Solar Impulse provides also new insights of efficiency of ground mobility and vice-versa.


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