Timeline for Would the solid material inside an airship displace air and be counted towards lift?
Current License: CC BY-SA 4.0
9 events
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| Jul 1 at 6:27 | comment | added | Oscar Bravo | @RobbieGoodwin Yes. If you put a cubic metre of iron on a scale, in a vacuum, it will read 7874 kg. If you do it in air at STP, it will be 1.3 kg lighter, because of the buoyancy from the cubic metre of air it displaces. | |
| Oct 18, 2020 at 14:52 | history | edited | quiet flyer | CC BY-SA 4.0 |
clarify
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| Oct 18, 2020 at 14:51 | comment | added | quiet flyer | @RalphJ -- I edited to this "Note that airplanes are much denser than airships, so they displace MORE air (per unit volume enclosed by the outer surface of the aircraft) than an airship with empty gas cells does. Of course that "advantage" is completely offset by the weight of the stuff that is doing the displacing.", then decided to just delete the first two sentences entirely, not really essential to the main point, and leads to useless arguments as to whether or not one is intending to include the volume occupied by the air inside the aircraft. | |
| Oct 18, 2020 at 14:46 | history | edited | quiet flyer | CC BY-SA 4.0 |
clarify
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| Oct 17, 2020 at 13:58 | comment | added | Ralph J♦ | "...displace more air per unit volume than..." WHAT? A think of X volume displaces that volume of air, irrespective of the thing's density. All reasoning that follows a misstatement like this is highly suspect. | |
| Oct 17, 2020 at 11:50 | history | edited | quiet flyer | CC BY-SA 4.0 |
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| Oct 16, 2020 at 23:42 | comment | added | Robbie Goodwin | What are you people suggesting, here? Metal displaces the same volume of air and that creates lift? A hollow tank with thin sides might but a sizeable chunk of metal? | |
| Oct 15, 2020 at 18:19 | history | edited | quiet flyer | CC BY-SA 4.0 |
added 105 characters in body
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| Oct 15, 2020 at 17:58 | history | answered | quiet flyer | CC BY-SA 4.0 |