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| Static Friction vs. Kinetic Friction https://www.rypn.org/forums/viewtopic.php?f=1&t=35013 |
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| Author: | Kelly Anderson [ Tue May 14, 2013 10:55 am ] |
| Post subject: | Static Friction vs. Kinetic Friction |
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| Author: | Frisco1522 [ Tue May 14, 2013 11:30 am ] |
| Post subject: | Re: Static Friction vs. Kinetic Friction |
Don't they have sand on British locos? What is all the steam coming out around the drivers? I don't understand everything I see here. Other than very excessive slipping. Maybe they should put aluminum oxide tires on her and do some rail grinding while they're out. |
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| Author: | Kelly Anderson [ Tue May 14, 2013 11:36 am ] |
| Post subject: | Re: Static Friction vs. Kinetic Friction |
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| Author: | Dennis Storzek [ Tue May 14, 2013 12:13 pm ] |
| Post subject: | Re: Static Friction vs. Kinetic Friction |
Is that engine superheated, with a dome throttle? It looks like he lost it with the units full of steam; finally decides at 1:25 to open the cylinder cocks and arrests the slip. |
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| Author: | Pegasuspinto [ Tue May 14, 2013 1:22 pm ] |
| Post subject: | Re: Static Friction vs. Kinetic Friction |
They were doing a burnout to get the tires hot for better grip. Just like at the drag strip. Steam to deliver the sand seems like a bad idea. Always have a wet rail to keep things lubed up. Even worse if you run out of sand. |
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| Author: | robertmacdowell [ Tue May 14, 2013 1:29 pm ] |
| Post subject: | Re: Static Friction vs. Kinetic Friction |
The British invented wheelslip, and remain the masters of the craft, clearly. Didn't they recently destroy an engine by overspeed during a wheelslip event? |
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| Author: | Pegasuspinto [ Tue May 14, 2013 1:52 pm ] |
| Post subject: | Re: Static Friction vs. Kinetic Friction |
http://en.wikipedia.org/wiki/LNER_Peppercorn_Class_A2_60532_Blue_Peter http://www.youtube.com/watch?v=YjsNbzg1UaI That was nearly 20 years agao now, is that recent? That's 1/10th of the way or so back into the total history of the steam locomotive. I think this latest video, they were just tired of continuously welded rail, and they are just putting the authentic clickety-clack back in the track. |
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| Author: | Dave [ Tue May 14, 2013 4:54 pm ] |
| Post subject: | Re: Static Friction vs. Kinetic Friction |
The more bits and pieces I pick up about tribology, the less I learn I know about it.....not always intuitively obvious. British practice is a lot of oil lubing everything and steam wet-sanding......I'd imagine they would develop an early and extreme familiarity with wheel slip and how to control it. dave |
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