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Old 11-18-2018, 05:08 PM   #120 (permalink)
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Yeah, I heard of solar balloms :

WORLD'S FIRST FULLY CERTIFIED AEROSOLAR FLIGHT — Aerocene



Anyway it's danger, since hydrogen would be easy to mess around and end up in :





Quote:
Originally Posted by freebeard View Post
I withheld the information for your own safety.

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