Envelope for hot air balloon has inner and outer envelopes interconnected along edges so that after inflation by air or gas a heat insulating double wall is formed between envelopes

摘要

The balloon has an inner(1) and an outer(2) envelope interconnected along their edges. Both envelopes are interconnected by threads(5) or point connections so that after inflation by air or gas a heat insulating double wall(4) is formed between the envelopes. The outer envelope is especially thin and light.