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| Thread ID: 129839 | 2013-03-16 02:37:00 | Variation of "Jet on a treadmill" issue, will the wheels turn? | The Error Guy (14052) | PC World Chat |
| Post ID | Timestamp | Content | User | ||
| 1332925 | 2013-03-18 02:48:00 | What ever you do error guy, let us know what airline you go to work for;) | plod (107) | ||
| 1332926 | 2013-03-18 03:54:00 | The Martin Jet Pack that we are all subsidising has to make other arrangements of course. More grants will be needed. Expect HD Videos "real soon". | R2x1 (4628) | ||
| 1332927 | 2013-03-18 04:46:00 | What ever you do error guy, let us know what airline you go to work for;) And if Pablo ever wants to fly up the sharp end, I'd appreciate it if he would let us know, too. |
WalOne (4202) | ||
| 1332928 | 2013-03-18 05:03:00 | If the treadmill matches the velocity of the plane the wheels will not turn I'm not sure how a treadmill can achieve any velocity unless dropped off the top of a tall building, but anyway:............ A jet is a reaction-propulsion device. The wheels will turn briefly as it rolls off the end of the treadmill and nose-dives into the ground, as it would if it were rocket propelled, and indeed, as it would if we were back at the 'propellor propulsion' version of this no-brainer. Has nobody ever seen the videos of cars flying off the end of dynamometers when engine torque (at the rear wheels) was greater than the dynamometer's capacity to handle? If in doubt, let Google be your guide. Cheers Billy 8-{) |
Billy T (70) | ||
| 1332929 | 2013-03-18 05:15:00 | In the experiment, you start with a jet on a treadmill. Very shortly after that you just have a treadmill. And yes, the wheels were probably spinning pretty fast as the jet took off (at the rotational equivalent of the ground speed of the jet + the treadmill speed if I'm not mistaken). Where does it get lift from in your theory? Ken |
kenj (9738) | ||
| 1332930 | 2013-03-18 05:16:00 | Where does it get lift from in your theory? Ken The crane :D |
The Error Guy (14052) | ||
| 1332931 | 2013-03-18 05:21:00 | Google does not show many jets on treadmills, but teenagers seem to try every other thing on them with predictable results. In the cause of scientific progress sacrifices must be made. | R2x1 (4628) | ||
| 1332932 | 2013-03-18 06:52:00 | Thanks Billy T Actually I was being a bit devious. I used the word velocity instead of speed. If the velocity of the treadmill is the same as the plane it means the direction is also the same as the plane's direction, and so the wheels don't turn. Of course, that means using a 500m-long (powered) treadmill or the whole treadmill is being physically transported along the runway. (In the latter case the movement is similar to being dropped off a building. You get marks for insight ;) ) |
BBCmicro (15761) | ||
| 1332933 | 2013-03-18 10:20:00 | There is a very good reason why they call them 'aircraft': they are not reliant on the surface of the planet for anything other than support while they reach lift-off speed, and the airflow over the wings doesn't give a toss what the wheels are doing. The motive power/forward propulsion comes from the jet (or propellor) and the air. Cheers Billy 8-{) |
Billy T (70) | ||
| 1332934 | 2013-03-18 19:31:00 | I assumed the plane was going the opposite way to the treadmill hence why the wheels will turn | gary67 (56) | ||
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