Steam and steam engines, part 3

[sandy_ACS]

     :nose  :twisted:  :twisted:

Hi PD's,

Just when you thought it was safe to.........well here is Part 3 of the Steam And steam engines Saga.

I am sure RED HAMISH will find it very easy...so I am expecting him to order a complete outfit for his next model....      

Eddy will also perhaps think twice about triple expansion...then again!!

anyway, I hope you all get something from it.

Best regards to all.

Sandy  :vacat  :computer  

[Engineman]

:
Eddy will also perhaps think twice about triple expansion...then again!!

Hmmm... Anyways...Triple expansion engine...
What do you think about this one?  It's not a 'fake' :roll: like my 'compound'.

[Eddy Matthews]

:
Eddy will also perhaps think twice about triple expansion...then again!!

anyway, I hope you all get something from it.

Best regards to all.

Sandy  :vacat  :computer  

Thanks Sandy, very informative.....  I can now see exactly why you don't recommend a triple expansion engine in a model

But we still need to convince you that you need to produce a diagonal twin (or better still triple) cylinder engine for use in our paddlers!

Glen Sannox (my favourite paddler) is earmarked for the building board next year, so time is getting short before I commit to electric power! Seriously I would be prepared to pay a fair price for the right engine for this model if it was available...

[sandy_ACS]

   

Hi PD's,

Engineman.....If I am not mistaken this is one of JMC's new triples..very nicely made and I am sure a very good running, and powerful engine, however, I would be suprised indeed if it had none of the usual triple vices...like dead centre issues....I accept that and engine with 120 deg cranks is possibly a bit better on this score, but, if the engine stopped for any length of time with the high pressure piston in a location just following high pressure cut-off, any remaining steam in the cylinder, or in the transfer pipe to the intermediate receiver, would condense out. In this state it is not possible for the engine to start, since the steam path is closed off by the high pressure slide valve...hence none of the cylinders will, or can, receive fresh steam via the standard regulator valve. The only way round this is to add a bypass valve, in the main steam feed, (what we call a whifter valve on the 'VIC 32') which will allow a whiff of high pressure steam into the intermediate receiver...possibly also into the LP receiver as well. This valve would have to be operated (opened and closed again) fairly quickly, since the steam pressure would be far higher than normal for these cylinders, and if left open for to long, could possibly cause some damage to the engine or low pressure valve gear.
It may also pay to make this valve a pressure regulating type, which would then pass a lower pressure steam, again, possible, but even more added complications for Radio control. Easier to do when you are in the engine room with a hot wheel spanner.

I accept that this most certainly can be achieved, even in a model boat, however, the added complexity of the bypass valve/s, possibly also a pressure reducing type, and the additional servo and transmitter channel required to operate it/them are certainly something to consider when thinking about a model steam boat destined for pleasure sailing.

It would be interesting to hear your thoughts/experiences on this and your own engine.

Eddy....what's all this talk about 'ELECTRIkery@  for your Glen Sannox.... :hmph

Let me have some rough dimensions... machinery deck level to paddleshaft centre, beam width available and overall headroom in the engine area, paddlewheel dia and speed etc....no promises, but I will have a think about it and see if anything can be done/made/purloined/even built....can't have you going over to the Dark SIDE can we.... :twisted:  :    :rant

Keep happy.

Sandy. :vacat    :computer

[Eddy Matthews]

Thanks Sandy,

I'll sort out rough dimensions etc and email you with details.... As the Glen Sannox is the ONE model I've always wanted to build, it would be a shame if it wasn't steam powered!

As with most of these things though it will all come down to affordability - Please don't take that the wrong way, I realise it won't be cheap!

Anyway, I'll get the dimensions sent over the next few days and we can go from there....

[sandy_ACS]

     

Me again,

Silly old ......forgot to add some interesting pictures.....how about one of these Eddy?

The black and white one was taken in the Harland and Wolf engine yard, when the full size engines were being built...note...the height of the workmen in relation to the crankshaft centreline......this is only the base plate section of the 'Titanics' engines.

The coloured ones are a true scale model.


Keep dreaming.

Sandy.  :sob

[Brian]

The largest Triple Expansion Steam engines built in the UK have now been restored to working condition, to see them visit "The Kempton Park Water Works", Feltham, Midlesex, UK.

Each of the two engines weighs 800 tons, and are 62 feet high. and are similar design to the engines on the ill-fated RMS Titanic show on an earlier posting.

For further information see the website - http://www.kemptonsteam.org/index.htm

Although these particular "water pump" engines were "shore-based" and were used to supply the people of London with water, and in 1963 they were pumping 86 million gallons a day.
.