Weather forecasts appear favorable for an Aug. 11 flight of the Helios prototype, an unmanned solar-powered airplane that could set an altitude record for a non-rocket powered winged aircraft. NASA's Dryden Flight Research program reported that final preparations are continuing for the aircraft, which was aimed at hitting 100,000 feet but may have to settle for about 95,000 feet (DAILY, Aug. 8). The declining sun angle and waning summertime may hamper the solar-powered aircraft's ...

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