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1/3 Scale Case Boiler


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  #461  
Old 03-07-2019, 11:49:01 AM
chrsbrbnk chrsbrbnk is offline
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Default Re: 1/3 Scale Case Boiler

there are these sorta after market power vent fans for water heaters that are all metal but kinda spendy
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  #462  
Old 03-07-2019, 12:08:37 PM
b7100 b7100 is offline
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Default Re: 1/3 Scale Case Boiler

Thanks for the sugestions. I am trying to keep it small, self contained, with no cords to mess with. I am thinking about making a heat shield around the motor so I can set it directly in the stack, I have a 30" extension pipe that will get it up away from the heat a bit. I am thinking that once the flues are warmed up real good and before the stack gets too hot l will just remove it. Never know what works till you try it.
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  #463  
Old 03-07-2019, 02:44:02 PM
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Default Re: 1/3 Scale Case Boiler

I know how u purest are but how about a simple male air fitting screwed into the base of the stack with a tube pointing upward inside to create a draft, hook up a air hose to a 12-volt compressor or to an air tank with a ball valve to control the amount of draft .
On my 1 1/2 inch scale train I teed off the steam draft line and power my draft with a 12 volt compressor hidden in the coal tender... Works perfectly on my Loco.
From lighting to fire to 90 PSI of steam pressure in less than 40 minutes .
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  #464  
Old 03-07-2019, 04:10:41 PM
b7100 b7100 is offline
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Default Re: 1/3 Scale Case Boiler

Hey Bird. That could work. Wouldn't need to tap into the stack. Already have an air chuck fitting. Just a matter of closing and opening a couple of valves. Then it would blow through the blower nozel. When steam builds up enough just disconect the air and turn on the steam
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  #465  
Old 03-07-2019, 08:37:52 PM
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Default Re: 1/3 Scale Case Boiler

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Originally Posted by Big Bird View Post
I know how u purest are but how about a simple male air fitting screwed into the base of the stack with a tube pointing upward inside to create a draft, hook up a air hose to a 12-volt compressor or to an air tank with a ball valve to control the amount of draft .
On my 1 1/2 inch scale train I teed off the steam draft line and power my draft with a 12 volt compressor hidden in the coal tender... Works perfectly on my Loco.
From lighting to fire to 90 PSI of steam pressure in less than 40 minutes .
Best Idea Yet. . .

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  #466  
Old 03-08-2019, 06:19:35 PM
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Default Re: 1/3 Scale Case Boiler

Upgrading the 4" wimpy stove pipe snokstak extension with a 4"x39" exhaust pipe. I had the end of the stove pipe crumpled to fit the stack. It didn't want to stay put. So I ordered a piece of 3 1/2" x 4 1/2"x13" tube that I machined to fit the stack so the extension will stay put. The stove pipe wasn't very durable. It got stepped on and ran over a few times.
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  #467  
Old 03-09-2019, 12:33:09 AM
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Default Re: 1/3 Scale Case Boiler

Once you hook up that air line to your draft you won't need a stack extension any more.
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  #468  
Old 03-09-2019, 01:26:50 AM
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Default Re: 1/3 Scale Case Boiler

Other than getting the smoke out of your eyes at times when the wind is in the wrong direction! What do you have for a compressor that will run for 40 minutes? I don't think the self contained rechargeable ones would go that long. I would think they would be the type that would have to be hooked to a cad battery.
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Old 03-09-2019, 03:14:30 PM
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Default Re: 1/3 Scale Case Boiler

I bought a small 12 volt compressor from Harbor Freight and used two 12volt sealed rechargeable batteries like pictured below.
No need for air storage tanks The little compressor will put out just enough air volume to create a nice draft .
By the time the battery runs dead, you should have enough steam pressure to run the steam draft..
I'd send a picture of the compressor as it's mounted in the tender but, it's buried behind a pile of steel building right now.
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  #470  
Old 03-14-2019, 01:09:30 PM
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Default Re: 1/3 Scale Case Boiler

The blower unit is complete. Seems to work well. Fan speed is infinantly variable. 8 - AA batteries makes 12 volts. Havn't tested as to how long it will run on these but the tiny fan motor can't use much juice. I will probably have to watch the heat. I am thinking once everything is warmed up the draft will be enough that it won't be needed. There is no plastic exposed to melt. Big bird your idea was great. I was already a ways along when you mentioned it.
This unit is small enough that I can just toss it in the tool box.
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  #471  
Old 03-27-2019, 06:37:54 PM
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Default Re: 1/3 Scale Case Boiler

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Originally Posted by b7100 View Post
The blower unit is complete. Seems to work well. Fan speed is infinantly variable. 8 - AA batteries makes 12 volts. Havn't tested as to how long it will run on these but the tiny fan motor can't use much juice. I will probably have to watch the heat. I am thinking once everything is warmed up the draft will be enough that it won't be needed. There is no plastic exposed to melt. Big bird your idea was great. I was already a ways along when you mentioned it.
This unit is small enough that I can just toss it in the tool box.
Looks Great, but Aren't the end caps of the motor itself plastic ???

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  #472  
Old 03-27-2019, 07:38:49 PM
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Default Re: 1/3 Scale Case Boiler

No plastic on the shaft end. There is on the other end. The motor sets down inside a cup that isolates it somewhat. I tried it out Sunday. It worked great. You can slow the speed way down. So it doesn't draw that much heat. Just enough to pull a nice draft. In starting the fire I turned it all the way up. It eliminated a lot of the problems in getting a draft going. Looks like it will keep the firebox door area (and engine) a lot cleaner. I pulled the fan when I had everything warmed up and a good draft going. Had the engine running in an hour which maybe isn't that great but better than before. It will get better after I use it. Also I found some brass polish called Wenol that seems to keep the brass from tarnishing so fast. Keeping everything looking good is a job on a steam engine.
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  #473  
Old 03-28-2019, 05:11:26 PM
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Default Re: 1/3 Scale Case Boiler

Wenol is the best brass polish I have found.
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  #474  
Old 03-28-2019, 05:54:54 PM
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Default Re: 1/3 Scale Case Boiler

It was recomended by Straasberg Railway. They also suggested Everbrite as a coating that has a 300 degree rating. I tried that on the brass around the bunker. I am waiting to see how that works. It's a coating so if there is a problem you almost have to strip it off and redo it. I am going to see how the wenol works out.
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Old 04-08-2019, 04:46:31 AM
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Default Re: 1/3 Scale Case Boiler

I have a question! I fired up yesterday and with the draft inducing fan I had 75 # of steam in 1 hr. In talking to Butch last night he suggested that that might be hard on an engine. Is it possible to damage a boiler by putting too much heat in too fast? Is there a sequence that might be better to follow as to when and where the cold draft air should enter the boiler? It looks like it would be a real pita to have to replace the flues on a 3d scale. Almost have to tip it on its side. Engine is running much better since I got the timing straightened out.
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Old 04-08-2019, 09:22:39 AM
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Default Re: 1/3 Scale Case Boiler

Finally got around to make the crank as was suggested in Chris's thread. It really helps moving it around. I gleaned a lot of information from Chris's thread. It was part of what inspired me. The crank fits over the shaft that I left sticking out of the flywheel about an inch. There is a tab that engages the flywheel set screw. Easy on and easy off. Then the stack extension and draft inducing fan.
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Old 04-15-2019, 05:45:33 PM
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Default Re: 1/3 Scale Case Boiler

Got some seats made!
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  #478  
Old 04-22-2019, 08:47:39 AM
1/4case 1/4case is offline
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Default Re: 1/3 Scale Case Boiler

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Originally Posted by b7100 View Post
I have a question! I fired up yesterday and with the draft inducing fan I had 75 # of steam in 1 hr. In talking to Butch last night he suggested that that might be hard on an engine. Is it possible to damage a boiler by putting too much heat in too fast? Is there a sequence that might be better to follow as to when and where the cold draft air should enter the boiler? It looks like it would be a real pita to have to replace the flues on a 3d scale. Almost have to tip it on its side. Engine is running much better since I got the timing straightened out.
Common in big power boilers is 100deg per hour. BUT keep in mind this is power boilers with large amounts of refractory and drums that are inchs thick. In those cases you don't wan the temp. gradiant. A boiler may be 5-6 stories tall and if the tubes, insulation and jacket are 100's of degrees off of normal operating temps that can cause problems. My worry wouldn't be so much about the boiler in a 1 hour warm up as it would be for the engine casting on a cold morning. That is a much more substantial chunk of iron that will see a larger temperature difference than the boiler until you start to pass steam or conduct enough heat through its mounts. But even then in our sizes I don't see it as an issue to lose sleep over.

To your question I don't think with the thicknesses we see in our small construction, with decent circulation in the boiler and the low temperatures we deal with you will do any damage. If you pump in water at 60 deg. you only have to raise another 150 deg. to start boiling. That's 1.5 hours adhering to the schedule of the big boys.
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  #479  
Old 04-29-2019, 05:50:06 PM
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Default Re: 1/3 Scale Case Boiler

75lbs in a hour doesn't sound to bad, I don't remember what I told you mine heated up in but I don't think it was far off without the fan.
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Old 05-19-2019, 04:22:13 PM
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Default Re: 1/3 Scale Case Boiler

Ok so it's raining and 65 degrees out. Cold boiler, cold city water, some crap wood half wet it took 1 hour and 25 minutes to have 90lbs of steam.
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