solar airship is a cross between a Hot Air Ballon and a Kite - the hot air inside causes the airship to rise (like a hot air balloon), and you hold onto the 50m tether line to stop it flying away (like a kite). The airship's black film outer layer absorbs the heat from the sun's rays, stokes up the air inside and voila! Let the hot air rise to the awe of pedestrians and terror of low-flying aircraft. Think hot air balloons, except with natural heat instead of gas
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