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<blockquote data-quote="Starfox" data-source="post: 4705097" data-attributes="member: 2303">Sorry to disappoint, but they need to be magical. No way a creature can float on stomach gas alone. I did some of the physics of airships playing Crimson Skies, and airships need to be huge to be able to fly. 1 cubic meter of hydrogen gas provides about 1 kg of lift. A sheep weights about 15 kg - it would take a gas balloon of 15 cubic meters to give one neutral buoyancy in air, more if its supposed to lift anything at all. This, of course, need not stop you. Media are full of creatures doing impossible things, often adding a bit of pseudo-science for believability. Say the gas bag holds phlogiston (which was postulated to have negative weight and was seriously believed to exist in the 18th century). They a bloated stomach would be enough.As for the lack of predators; not hard to understand at all. No predator can reach them at 300 ft.; they are too large (and dangeous) for birds of prey.</blockquote>

[QUOTE="Starfox, post: 4705097, member: 2303"] Sorry to disappoint, but they need to be magical. No way a creature can float on stomach gas alone. I did some of the physics of airships playing Crimson Skies, and airships need to be huge to be able to fly. 1 cubic meter of hydrogen gas provides about 1 kg of lift. A sheep weights about 15 kg - it would take a gas balloon of 15 cubic meters to give one neutral buoyancy in air, more if its supposed to lift anything at all. This, of course, need not stop you. Media are full of creatures doing impossible things, often adding a bit of pseudo-science for believability. Say the gas bag holds phlogiston (which was postulated to have negative weight and was seriously believed to exist in the 18th century). They a bloated stomach would be enough. As for the lack of predators; not hard to understand at all. No predator can reach them at 300 ft.; they are too large (and dangeous) for birds of prey. [/QUOTE]

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