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7/18/2025, 9:45:16 PM
>>11336592
>30 feet
Brachiosaurs were 40 feet tall and weighed 50 tons, with the very dangerous constraint of their heads being ~25 feet away from their hearts so their arteries had to pump for a brain that was ~20 feet above in the vertical. The Earth didn't have quite as much gravity back then as it has now due to space dust but we should still assume the gravitational differences to be negligible. Brachiosaur feet were around 1 meter wide (https://www.amnh.org/explore/news-blogs/largest-dinosaur-foot-study) so that weight was carried across ~3 square meters if brachiosaurus walked with 3 feet on the ground at all times.
If we assume a body with fit-male-equivalent bone and muscle density, ~200lbs at 6', size 12 feet (30 square inches roughly), then scaling up to 30' would be a factor of 5^3 and result in ~12.5 tons of weight, carried across ~0.5 square meters during a walking step, with a heart-to-head distance of only about 6-7 feet. If we assume science-fantasy conventions such as biometals reinforcing bones in a way similar both to rebar in concrete and to the wasps that have biometal-reinforced stingers, and assume unnatural muscle that allows for both maximum power and human-equal twitch speed, then those unnatural bio enhancements would need to triple the human body density to match the total mass of the brachiosaur. The footprint size and shape strain of the foot is the big problem with regards to support of the weight, nothing particularly wrong with an upright form apart from that. Footfags would be the big losers in a square cube adjustment scenario. There would also be an immediate problem regarding oversized human eyes, and the material of the skin.
>30 feet
Brachiosaurs were 40 feet tall and weighed 50 tons, with the very dangerous constraint of their heads being ~25 feet away from their hearts so their arteries had to pump for a brain that was ~20 feet above in the vertical. The Earth didn't have quite as much gravity back then as it has now due to space dust but we should still assume the gravitational differences to be negligible. Brachiosaur feet were around 1 meter wide (https://www.amnh.org/explore/news-blogs/largest-dinosaur-foot-study) so that weight was carried across ~3 square meters if brachiosaurus walked with 3 feet on the ground at all times.
If we assume a body with fit-male-equivalent bone and muscle density, ~200lbs at 6', size 12 feet (30 square inches roughly), then scaling up to 30' would be a factor of 5^3 and result in ~12.5 tons of weight, carried across ~0.5 square meters during a walking step, with a heart-to-head distance of only about 6-7 feet. If we assume science-fantasy conventions such as biometals reinforcing bones in a way similar both to rebar in concrete and to the wasps that have biometal-reinforced stingers, and assume unnatural muscle that allows for both maximum power and human-equal twitch speed, then those unnatural bio enhancements would need to triple the human body density to match the total mass of the brachiosaur. The footprint size and shape strain of the foot is the big problem with regards to support of the weight, nothing particularly wrong with an upright form apart from that. Footfags would be the big losers in a square cube adjustment scenario. There would also be an immediate problem regarding oversized human eyes, and the material of the skin.
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