Solar Balloon France offers you to make solar hot air balloons yourself. On the website you will find plans and instructions for making different models of solar hot air balloons. Made, in most cases, from black garbage bags, 50 liters or 100 liters. You will be able to verify for yourself the theory on the Archimedes thrust. A solar hot air balloon uses the sun's radiation to heat its envelope and by conduction heat the air inside it.