Subject:
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Re: Stupid question about steam engines
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Newsgroups:
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lugnet.trains
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Date:
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Wed, 5 Apr 2000 19:38:31 GMT
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Reply-To:
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johnneal@/spamless/uswest.net
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Viewed:
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2290 times
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James Powell wrote:
> In lugnet.trains, John Neal writes:
> > Of course, more wasn't better. More wheels meant less weight per wheel thus
> > protecting rails which couldn't support that much weight.
>
> It doesn't matter! It is FOA which matters, if you have 100 powered wheels or
> 2 powered wheels, if you have the same weight above them, you can deliver the
> same torque to the track to start the train.
> (FOA=Factor Of Adhesion, Tractive Effort/Weight on driving wheels)
I wasn't referring to power so much as overall weight bearing down upon the rails
themselves. So if you had rails on a soft bed, you couldn't utilize engines
whose weight wasn't distributed over X amount of drivers/and or unpowered wheels;
it would simply push the rails apart. Are we talking about 2 different things?
-John
>
>
> FOA's below 3 with steam are _very_ slippery, 4 was a common FOA with steam.
> Diesels go down to 2-2.5 FOA, because the power is available constant
> throughout the wheel revolution (same with geared steam, FOA can be lower, for
> example the 100 HP Sentinels were rated at 14000 Lb TE and a weight of 33000
> Lb, ballasted)
>
> James P
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Message has 1 Reply:
 | | Re: Stupid question about steam engines
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| (...) rails (...) wheels; (...) things? (...) for (...) Picking up on what James has written, the uneven power pulses of a traditional steam engine hammer the track - this eventually pushes the rails apart/sinks them. It's quite amazing to witness (...) (25 years ago, 5-Apr-00, to lugnet.trains)
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Message is in Reply To:
| | Re: Stupid question about steam engines
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| (...) It doesn't matter! It is FOA which matters, if you have 100 powered wheels or 2 powered wheels, if you have the same weight above them, you can deliver the same torque to the track to start the train. (FOA=Factor Of Adhesion, Tractive (...) (25 years ago, 5-Apr-00, to lugnet.trains)
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