Hi @LeGo Léo! Welcome to our forum and we are happy that you are so much into solar balloons!
As well, I admire your actions within “Tête en Terre”, this sort of community collaboration is always so positive for everyone involved. Regarding building an Aerocene Explorer, yes, ripstop 7d is expensive. We have been investigating for a while the possibility of building with used sails such as spinnakers, which could eventually be a lot cheaper. On top of this building with a used material is friendlier to the environment. Also please do check Museo Aerosolar construction in Buenos Aires last year > Aerocene - TECAT
How to build an Aerocene?
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