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I spent... longer than I should have trying to take advantage of this bug to recreate a stable version of the stereotypical tall iceberg that the original twee

by maxrmk 6y ago

I spent... longer than I should have trying to take advantage of this bug to recreate a stable version of the stereotypical tall iceberg that the original tweet was complaining about. https://imgur.com/a/WG6D0RJ https://imgur.com/a/WG6D0RJ

rbobby 6y ago
From left to right draw a sawtooth shape. Make the last one very wide. Then retrace your steps completing the other half of the sawtooth. https://imgur.com/a/Kb8Y8zv https://imgur.com/a/Kb8Y8zv (there are about 4 completed saw tooths above the screen)
sgtnoodle 6y ago
You can create pontoons by circling over the same spot repeatedly. It's like you're concentrating more mass into the same area but reducing the density! https://ibb.co/VmXShfY https://ibb.co/VmXShfY
rampant_ai 6y ago
I was able to make sailboats that float if I cross the line over itself so the sail is in "negative space", which keeps it upright. Kinda neat! https://i.imgur.com/2LZn50v.png https://i.imgur.com/2LZn50v.png
- sgtnoodle 6y ago
  It's prettier than my boat. :-) I believe it works because the sail consists of negative mass. The overall mass of the boat is therefore lower, but the part of the hull that's under water produces the same amount of bouyancy based on the area of displaced water. Because of the width of the hull, it's a stable equallibrium. Interestingly, if the sail were to become submerged, it would create negative bouyancy and the boat would sink!
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WJW 6y ago
I don't think there is a stable "vertical" configuration without the negative mass trick from crossing lines: https://en.wikipedia.org/wiki/Metacentric_height https://en.wikipedia.org/wiki/Metacentric_height Any convex shape will tend to minimize the forces due to buoyancy and "horizontal" should always go less deep (or equal for a sphere) than "vertical"
- mawise 6y ago
  https://imgur.com/a/OjuWEKK https://imgur.com/a/OjuWEKK It can be in a local minima of buoyancy without being a global minima. Similar to an un-sharpened pencil balanced on it's end.
  - WJW 6y ago
    Cool, I stand corrected. I tried with a few triangles of my own but they never stayed upright, but maybe I just suck at drawing and they all started too far off-center to remain in the little "valley" of the stability diagram.
crazyKoala2 6y ago
I made a vertical one just by making it very thin: https://gliggy.github.io/tallandthin.png https://gliggy.github.io/tallandthin.png

by maxrmk 6y ago

rbobby 6y ago

From left to right draw a sawtooth shape. Make the last one very wide. Then retrace your steps completing the other half of the sawtooth. https://imgur.com/a/Kb8Y8zv https://imgur.com/a/Kb8Y8zv (there are about 4 completed saw tooths above the screen)

sgtnoodle 6y ago

You can create pontoons by circling over the same spot repeatedly. It's like you're concentrating more mass into the same area but reducing the density! https://ibb.co/VmXShfY https://ibb.co/VmXShfY

rampant_ai 6y ago

I was able to make sailboats that float if I cross the line over itself so the sail is in "negative space", which keeps it upright. Kinda neat! https://i.imgur.com/2LZn50v.png https://i.imgur.com/2LZn50v.png

sgtnoodle 6y ago
It's prettier than my boat. :-) I believe it works because the sail consists of negative mass. The overall mass of the boat is therefore lower, but the part of the hull that's under water produces the same amount of bouyancy based on the area of displaced water. Because of the width of the hull, it's a stable equallibrium. Interestingly, if the sail were to become submerged, it would create negative bouyancy and the boat would sink!

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WJW 6y ago

I don't think there is a stable "vertical" configuration without the negative mass trick from crossing lines: https://en.wikipedia.org/wiki/Metacentric_height https://en.wikipedia.org/wiki/Metacentric_height Any convex shape will tend to minimize the forces due to buoyancy and "horizontal" should always go less deep (or equal for a sphere) than "vertical"

mawise 6y ago
https://imgur.com/a/OjuWEKK https://imgur.com/a/OjuWEKK It can be in a local minima of buoyancy without being a global minima. Similar to an un-sharpened pencil balanced on it's end.
- WJW 6y ago
  Cool, I stand corrected. I tried with a few triangles of my own but they never stayed upright, but maybe I just suck at drawing and they all started too far off-center to remain in the little "valley" of the stability diagram.

crazyKoala2 6y ago

I made a vertical one just by making it very thin: https://gliggy.github.io/tallandthin.png https://gliggy.github.io/tallandthin.png