Timeline for Does a credible Kármán plane reach escape velocity within 1 minute or does it follow the curvature of the Earth? [duplicate]
Current License: CC BY-SA 4.0
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| Jan 2, 2019 at 14:30 | comment | added | user20636 | Of course it accounts for it @Conelisinspace -- the definition is that the (maximum) lift is the same as the centrifgual force, which would result in it being able to travel in a straight (not earth following) line at and below (but not above) the Karman line. | |
| Dec 26, 2018 at 10:09 | comment | added | Cornelis | @JCRM I have to admit that you're right ! But i just followed the Wikipedia definition that doesn't account for the centrifugal force. | |
| Dec 26, 2018 at 4:29 | history | closed |
user20636 uhoh DrSheldon Steve Linton Magic Octopus Urn |
Duplicate of Is the definition of the Kármán line from Wikipedia right? [closed] | |
| Dec 25, 2018 at 21:30 | comment | added | user20636 | Your calculation is mistaken. You have failed to factor in the centrifugal force of the plane as it accelerates, which would reduce the speed requirement to generate sufficient lift to continue flying in a straight line. | |
| Dec 25, 2018 at 21:16 | history | edited | Cornelis | CC BY-SA 4.0 |
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| Dec 25, 2018 at 20:45 | history | edited | Cornelis | CC BY-SA 4.0 |
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| Dec 25, 2018 at 20:29 | comment | added | user20636 | no, at or below the karman line it does not need to curve towards the Earth. At or above the Karman line it can not curve away from the Earth. | |
| Dec 25, 2018 at 19:55 | comment | added | Cornelis | So isn't it one way or the other ? Doesn't that mean the Kármán plane has to follow the curvature of the Earth ? That's the point i try to make. | |
| Dec 25, 2018 at 19:50 | history | edited | Cornelis | CC BY-SA 4.0 |
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| Dec 25, 2018 at 19:35 | comment | added | user20636 | If it was decided to accelerate the vessel to the speed required to maintain lift, then yes. it would need to exceed escape velocity. So what? That's kind of the point of the Karman line - it's ridiculous to try to do anything aerodynamically above it. | |
| Dec 25, 2018 at 19:12 | history | edited | Cornelis | CC BY-SA 4.0 |
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| Dec 25, 2018 at 18:28 | history | edited | Cornelis | CC BY-SA 4.0 |
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| Dec 25, 2018 at 17:12 | comment | added | Cornelis | @uhoh And still you are using that calculation there for a very fast moving Kármán plane that does not accelerate towards the centre of the Earth. To me, that looks like a straight trajectory. | |
| Dec 25, 2018 at 15:56 | comment | added | uhoh | @Conelisinspace Again that is wrong. The calculation was instantaneous. There was no motion, no trajectory. It was evaluated at a single moment in time. Just like I've already stated above | |
| Dec 25, 2018 at 13:59 | history | edited | Cornelis | CC BY-SA 4.0 |
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| Dec 25, 2018 at 13:36 | history | edited | Cornelis | CC BY-SA 4.0 |
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| Dec 25, 2018 at 13:28 | comment | added | Cornelis | @uhoh I try to prove the point that Wikipedia is wrong, not Von Kármán ! On the contrary, to me Von Kárman is right because he din't ignore the centrifugal force ! | |
| Dec 25, 2018 at 13:01 | comment | added | uhoh | "...it can be rather easily calculated that within a minute that plane would..." consider adding your calculation to the question. "So isn't there a contradiction in that definition..." several answers to several of your previous questions have addressed this for you already. Next time (you can't now, there's already an answer posted) consider leaving out the "Was Karman wrong?" part of the question and just discuss the trajectory without using it to try to prove a point. | |
| Dec 25, 2018 at 12:13 | comment | added | uhoh | The ad hoc and informal way that this was first done used an instantaneous evaluation of forces and involved no propagation of motion into the future. OP continues to play games with questions by pretending the Karman line is something that it's been well established that it isn't. I recommend the OP proposes a new site called orbit golf, similar to code golf in area51 and stop playing games here. | |
| Dec 25, 2018 at 12:06 | comment | added | uhoh | How many variants of the “Was Karman wrong?” question is e̶n̶o̶u̶g̶h̶ too many for one user? | |
| Dec 25, 2018 at 11:50 | review | Close votes | |||
| Dec 26, 2018 at 4:29 | |||||
| Dec 25, 2018 at 11:48 | answer | added | user20636 | timeline score: 1 | |
| Dec 25, 2018 at 11:36 | comment | added | user20636 | why does it matter what it does when it is no longer at the karman line travelling at orbital velocity? It's an abstract construct. | |
| Dec 25, 2018 at 10:51 | history | asked | Cornelis | CC BY-SA 4.0 |