Aviation Photo #0681953 Wörner NL-640/STU - Warsteiner

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The unique shape of a gas balloon. Instead of being suspended by heating a volume of air, the balloon is kept afloat with helium gas. To ascend the pilot drops sand out of the basket. This is a modern "netless" type - traditional gas balloons have a net covering the balloon envelope.
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Photo Added: October 03, 2004

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