>Literally how floating works.
Yes, ignoring momentum. Do parachutes just get stuck in the air halfway down? When do you inflate it? If you inflate it, can you even deorbit? Do those pop when you deorbit? Do you cover the balloon with big heavy heat shield tiles?
I'm not claiming I understand this at all, but you seem to have some child's grasp of "how floating works".
> By launching your rocket from the ballon city and returning to orbit.
Launching from the solid ground shakes it (the ground) like a leaf. But you're going to launch a rocket from the balloon, and you can't quite see where there might be a problem.
>Why is this unique to Venus versus anywhere else in space?
If I can't get the materials to repair my building in a hurry, I go outside and I wait. Or I stay inside and I wait. And if I can't do that for my Venusian balloon city, I slowly sink into a zone that melts lead and bakes me alive. And if I get the materials after it has stared sinking, repairing it won't reinflate the balloon and have it rise again, because some significant fraction of the air has leaked out.
>If I can't get the materials to repair my building in a hurry
At that point you might as well be asking "what if they forgot to put fuel in the space ship" or "what if the astronaut missed launch because he forgot to set his alarm". That would be bad but that's not about Venus.
The guy you're responding to is an aerospace expert, iirc.
Anyway, the balloon would be relatively stable. The atmosphere gets increasingly dense as you go towards the surface, while the balloon has a particular density which is more than the wispy far atmosphere and less than the dense low atmosphere. Therefore, if you were to drop it at the top, it would fall (while it's more heavy) then approach the altitude where it's equally dense, and start bobbing around there, until it settles at its equilibrium.
Picture a glass cylinder of water and oil. It's cleanly separated with the denser water on the bottom and oil on top. Then drop an ice cube in. It will sink through the oil and then float, in the middle of the cylinder, on the water.
Last I heard, though acidic, the Venusian atmosphere is not made of oil and vinegar. Nor does it have hard strata lines.
Suddenly losing or gaining a few hundred tonnes of mass will do interesting things to a free-floating aerostat.
> If I can't get the materials to repair my building in a hurry, I go outside and I wait. Or I stay inside and I wait. And if I can't do that for my Venusian balloon city, I slowly sink into a zone that melts lead and bakes me alive. And if I get the materials after it has stared sinking, repairing it won't reinflate the balloon and have it rise again, because some significant fraction of the air has leaked out.
It's more similar to a boat than a house. If your boat has a leak, you need to repair it very quickly or it ends up at the bottom of the ocean. Yet we've managed to do it relatively reliably.
>Yet we've managed to do it relatively reliably.
Sure. Do that when you're in the middle of an ocean that's a few trillion miles wide. It's not as if you can just dive down to the bottom of the ocean there, mine some bauxite, take it back up to your sinking ship, refine it, manufacture new repair materials for the boat, then repair it, is it?
No, you have to have it shipped from a coast a trillion miles away. So again, where are they manufactured, and how long do they take to get there? Can any of this shit even be made in the vicinity of Venus, where transit times might be non-absurd? There are no recoverable materials on the planet itself, are there?