Milton Loco Works burner- we want... information!
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New Haven Neil
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re secondary air - I understand (from an impeccable source
) that on the generic locos, the second hole on the burner mounting plate that looks like a screw is missing, is for exactly that (secondary air, not to tell me I have a screw missing.....).New Haven Neil
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I'll have that, good point. I wonder what size the Milton holes are though - anyone got one??
NHN
The Roundhouse one was designed with Leeds University- being a contract it will have been worked on by lecturers and post grad students- i.e. people a lot smarter than I am!
I'm just sticking to Accucraft locos- standard vs Milton vs meshed standard.
I think David is probably on the money, I certainly like that theory and will probably give it a try.
I'm just sticking to Accucraft locos- standard vs Milton vs meshed standard.
I think David is probably on the money, I certainly like that theory and will probably give it a try.
New Haven Neil
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The superheater tube worries me a bit- it glows red hot! Having pulled mine out the other day it's also distorted quite considerably with the heat.
New Haven Neil
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Yes, I noticed the steam pipe ran under the boiler - it took it noticeably longer to warm through than my other engines with 'superheaters' - which is a whole new discussion - Bradypus was going to try to measure the steam temperature, but I think he's gotten a bit too busy moving house and running a business......
It would be interesting to see if the presence of the superheater pipe is affecting the flame at all......
It would be interesting to see if the presence of the superheater pipe is affecting the flame at all......
Digressing slightly, mention of the superheater pipe reminded me of a loco a mate fixed for an acquaintance of his. The problem was a superheater pipe blocked with carbon.
A quick bit of research revealed the following quote from Roundhouse's website in the technical section regarding steam oil.
"The change of oil was brought about a few years after Roundhouse adopted internal gas firing and a small number of engines were experiencing blocked super heater pipes after prolonged use. The blockages were caused by carbonised oil, though this had never been a problem with the earlier externally fired models."
I suspect this may have been caused by overfilling the lubricator and then screwing the top on forcing neat oil into the steam pipe.
A quick bit of research revealed the following quote from Roundhouse's website in the technical section regarding steam oil.
"The change of oil was brought about a few years after Roundhouse adopted internal gas firing and a small number of engines were experiencing blocked super heater pipes after prolonged use. The blockages were caused by carbonised oil, though this had never been a problem with the earlier externally fired models."
I suspect this may have been caused by overfilling the lubricator and then screwing the top on forcing neat oil into the steam pipe.
New Haven Neil
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Digress? US? 
I agree totally Neil, it amazes me there aren't more examples of this happening. Changing the formulation of the oil will have helped, but I can't see it entirely eliminating the issue.
Once warmed up the loco ran well, but it did seem to use a lot of water......but the boiler is small. Hard to tell really, how much difference it makes. Matt's next thermo thesis maybe, an investigation into the value of superheating in small locomotives?
I agree totally Neil, it amazes me there aren't more examples of this happening. Changing the formulation of the oil will have helped, but I can't see it entirely eliminating the issue.
Once warmed up the loco ran well, but it did seem to use a lot of water......but the boiler is small. Hard to tell really, how much difference it makes. Matt's next thermo thesis maybe, an investigation into the value of superheating in small locomotives?
New Haven Neil - 23/11/2009 11:44 AM
Digress? US?
I agree totally Neil, it amazes me there aren't more examples of this happening. Changing the formulation of the oil will have helped, but I can't see it entirely eliminating the issue.
Once warmed up the loco ran well, but it did seem to use a lot of water......but the boiler is small. Hard to tell really, how much difference it makes. Matt's next thermo thesis maybe, an investigation into the value of superheating in small locomotives?
I concurr, the Baldwin does use alot of water.
An interesting point came up about the superheater pipe on GSM towards the end. Someone said (can't remember who) that if some water found its way into the tube (red-hot, as those of us who dare to peer down the flue of fire-breathing Accy will know), it could very quickly vaporise and this would lead to a large but brief surge in power. This could happen when the boiler was very full (but not when priming, as presumably much water would cool the tube) but also if it was quite full and the loco went over a summit or a bump in the track. This seemed a very logical explanation to me of something I had seen a few times but had never really worked out.
Any thoughts or experiences anyone?
Any thoughts or experiences anyone?
New Haven Neil
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Yes, I have seen this happen very briefly. I also used to drive a 9 1/2 gauge pacisifc that could do it too (radiant superheaters) - now that was frightening! She would slip like nothing on earth.
New Haven Neil
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Doug - 23/11/2009 12:10 PM
New Haven Neil - 23/11/2009 11:44 AM
Digress? US?
I agree totally Neil, it amazes me there aren't more examples of this happening. Changing the formulation of the oil will have helped, but I can't see it entirely eliminating the issue.
Once warmed up the loco ran well, but it did seem to use a lot of water......but the boiler is small. Hard to tell really, how much difference it makes. Matt's next thermo thesis maybe, an investigation into the value of superheating in small locomotives?
I concurr, the Baldwin does use alot of water.
Lucky man, you have one!! They are a nice model with heaps of detail.
Reduced water consumption is of course one of the great benfits of superheating.
Looks like our little superheaters may work better then I give them credit for!!
One of the guys at the local 16mm Assoc group is heavily modifying a Baldwin - blow down valve on the water gauage, and i think an axel driven pump for the water - uses the side tank for water.
<p>Eeek! I shall re- read that when I'm more awake. I feel it might be a bit more complex than my very basic grasp of fluid mechanics and thermodynamics can cope with- especially turning it into something I can actually coherently explain and calculate!</p><p>Thankyou though Chris, plenty to think about!
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</p><p>Interesting Doug. Is this the same guy who says if you run it you will wear out the valve gear?</p>
Yes indeed, his is showing wear already, but he does run it alot. He says don't run them with a heavy train.
He has 2 of them, one from the batch of locos that weren't built properly - he's re-built it and is now converting it (the one in the pictures), still has a slightly rotated boiler - it isn't upright. The other one he has he is keeping as supplied.