High Temperature Solar Hot Air Blimp

Normal black LDPE plastic can only handle 100C hot air temperature, while graphite black coated aluminium foil balloon can withstand up to 600C hot air. Ambient air density is approximately 1.2g/L, 100C hot air density is 0.95g/L and 600C hot air density is 0.4g/L, while helium density is approximately 0.2g/L. Other metal foil materials can withstand even higher air temperatures, including copper and steel foil and carbon fiber cloth balloons. 20x10x10m rectangular cube balloon has 2000kg of lift using helium, and 400kg of lift using 100C hot air and surface area of 10x10m x10 = 1000m^2, with weight of 50g/m^2 giving total balloon fabric weight of 50kg. Black surface captures solar heat during the day requiring minimal stove burner heat for flight.