How does the Deltic power unit work? | Curator with a Camera Extra
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- Опубликовано: 28 июн 2024
- Anthony Coulls explains the workings of the innovative Deltic power unit, using a cross-section that was used by Napier to showcase the technology in the 1950s.
Watch our tour of the rest of the Deltic: • Deltic: Step inside th...
To find out more about the National Railway Museum, visit our website: www.railwaymuseum.org.uk/
Chapters:
0:00-0:10 Intro
0:10-0:39 The Deltic's Secret
0:39-1:48 Why is it triangular?
1:48-3:15 Application to the rail network
#railways #locomotive #britishrailways 
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Another fantastic explanation, thank you! An interesting postscript would be some suggestions of why we don't now see Deltic engines everywhere... unless those teething problems turned out to be more significant than the video suggests. Please keep making these curator clips, they really are great
Decent explanation. Just a slight criticism: there are no explosions in a properly working engine; it's a controlled burn, and it's the control that gives the power. The more exact you can control the air/fuel mixture, ignition time, and burn rate, the more power you can squeeze out of the fuel. Delta engines do however share a fault with Wankler (rotary) engines: they're great in theory, but the complex construction makes them difficult to maintain and over time they start to leak and loose pressure, which drastically lower their power output. It's a design that's great for high power output, but they're typically shortlived. It's why these designs never became very popular. The extra mass of a traditional engine is outweighed by the fact it's easier to maintain and has a much longer lifespan.
Indeed, I had failed to read my Ladybird book of the Locomotive that morning. As the owner of a diesel powered road roller I should know that regardless!
Great static model and a clear explanation. They don't make 'em like they used to.... (I served with Deltics in RN minesweepers)
I remember the deltics out of kings cross when we went up to Welwyn garden city when my parents were house hunting!
Yay, more railway stuff
From the comments below, maybe these are the reasons why the Deltic, as great as it is, wasn't continued in other locos.
I wonder what other locos you might have a look at (like the Ffestiniog prince or princess loco or A1X terrier Stepney or one of his brothers and sisters) or maybe the legendary flying Scotsman loco (my most favourite locomotive)
They will only do engines and rolling stock that they own so they won’t do Prince, Princess or Stepney.. They might end up doing Stepney’s sister Boxhill which they do own. They will most likely do 4472 at some point this year as 2023 is her centenary year
@@terrier_productions ah ok I see, you have a good point about Stepney and other locos, it would be nice to see 4472/60103 again which I haven’t seen in a few years now since seeing him/her whatever you call the locos nowadays and these-days at didcot heritage railway, I’m sure they can visit other museums rather than just do one museum and tell the history of other locos and have a look at them in this current year
Press the Button! Plz! Cheers!
Its ironic how 22 Deltics replaced 35 A4s yet 6 of each class are preserved
Well 7 deltics if you include the prototype 👍
@@CustomiZe_ yeah true
I went there last week I pushed the button and it didn’t work
I was going to comment that it looked like an animated model and that it was a shame he didn't make it move, now I know why!
Replicating why the Deltic design was not expanded to other railways or even regions. Just over twenty years in service is short lived by locomotive standards. Eg HST.
It used to work and was on display in Great Hall. Unfortunately a component has failed and it's proving very difficult to source a replacement.
We did find this short video of it in action, taken by a visitor ruclips.net/video/vUxMj275V3I/видео.html
Thanks for visiting!
I enjoyed the museum it's probably the best museum I've been to for a long time
Deltit camera ⅔4
The presenter is a little confused about why the Deltic engine is light weight and can rev high. In an inline engine the cylinder head is not that heavy - its only a small fraction of the total mass. A average man can lift and carry the head of an average 4 cylinder diesel engine - even a 6 cylinder with significant strain. I can anyway, and I'm only a little chap. An average man has no hope of picking up and carrying a 4 cyl engine block. Just the crankshaft and flywheel weigh more than the head. If you visualise an opposed piston engine with an imaginary plane midway between the pistons at TDC, you'll see that it is really just 2 inline engines siamesed at that imaginary plane. In other words, instead on one big engine, you have two smaller engines, each of half the displacement and half the stroke. So the stresses on the crankshafts are reduced to 25% - because you have half the force acting on half the crank throw. Big ends and bearings can be a lot smaller. That's the main reason why it's light and high reving, not because there is no cylinder head.
In the case of the Deltic diagram shown in the video, instead on one big 3 cyl engine, you've got the equivalent of 6 little single cyl engines or if you like the equivalent of a 6 cyl inline engine of the same total displacement. There is a further advantage in that you've got three crankshafts and not 6, but each the three don't need to be heavier than each of the 6 would need to be, because the power strokes come at different times.
There are some minor advantages of the more common opposed piston designs (eg in Commer Knocker) in fuel efficiency that come from short stroke and being able to have the minimum piston-to-piston distance position offset from exactly centred between the crank centres - this improves scavenging, and is done by having the two cranks rotate a little out of phase. However this is not possible in a Deltic with three crankshafts.
And of course the presenter erred in saying there is an explosion. It is a timed controlled burn, typically lasting between 8 to 10 degrees before TDC and 8 to 10 degrees after TDC at full power.
So, why don't we see Deltic engines all over the place now? Maybe there were problems that you didn't cover? Indeed, there were: reliability was poor, lifetime was poor, and maintenance was a chore.
Maintenance looks like an absolute nightmare!