I started looking at lighter than air vehicles for my project, but hit a stumbling block early in my research regarding how much helium you would need to stockpile.
In an interview with a blimp pilot I heard him state the "We lose 10 percent of our volume of helium per week", but I have also seen a Military contractor pushing blimps claiming that 3% loss per year is what could be expected.
Those numbers (the only ones I could find) are so radically different that I pretty much gave up figuring out the logistics.
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