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Uncomplicated Steam Boiler for first wobbler please

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BW26/01/2019 12:05:02
206 forum posts
36 photos

Hello,

This one seems too simple anybody built it ? Any comments ?

http://npmccabe.tripod.com/simpleboiler.htm

Am getting a tadge confused about boilers - have done some googling and they seem to be complicated things.

Any recommended boiler plans / websites / books for a novice builder to consider ? I only want to run little models of wobblers ie over the next few years maximum bore 25mm maximum stroke congruent with that.

My first wobbler running quite happily on 12volt car tyre inflator but would like to have a go at running it on steam.

Bill

BW26/01/2019 12:09:11
206 forum posts
36 photos

....... and this one doesnt seem to complicated

http://www.steves-workshop.co.uk/modelboats/steamlaunch/boilerdesign/simpleboilerdesign.html

Brian G26/01/2019 13:08:57
457 forum posts
9 photos

You could look at Tubal Cain's "Building Simple Model Steam Engines". **LINK**

Brian

3404626/01/2019 14:42:56
350 forum posts
2 photos
Posted by Brian G on 26/01/2019 13:08:57:

You could look at Tubal Cain's "Building Simple Model Steam Engines". **LINK**

Brian

 

Excellent suggestion. Both Vol 1 and Vol 2 have ideal vertical and horizontal boilers also matching wobblers.

I bought both of mine on ebay for a couple of pounds each and have completed most of the builds. A simple pot boiler will be more than adequate. I cheated on the flanged end plates as not happy with my efforts, and machined them from copper bar. 

Send PM if you need any info like boiler sizes etc.

Bill

 

Edited By Bill Chugg on 26/01/2019 14:46:28

Tomfilery26/01/2019 16:23:30
108 forum posts
4 photos

Bill,

Your first proposed design is awful - made literally from a soup tin - don't even consider it!

Your second one looks a much safer bet.

Regards Tom

3404626/01/2019 16:34:48
350 forum posts
2 photos
Posted by Tomfilery on 26/01/2019 16:23:30:

Bill,

Your first proposed design is awful - made literally from a soup tin - don't even consider it!

Your second one looks a much safer bet.

Regards Tom

Tom

Just clicked the link and there is a warning there not to build this boiler as below :-

First things first: I absolutely recommend that you not build this boiler.

BW27/01/2019 00:05:28
206 forum posts
36 photos

Thanks for your comments.

Have ordered the first Tubal Cain book and shall commence learning how to silver solder. Have been avoiding doing this for some time now.

FYI ........ Interesting that I just saw a thread on the Mamod alternative forum where the use of silicon rubber tube to carry steam is considered. That might make things easier for us novices.

My wobbler only needs 5psi .......... I saw a thread somewhere recently where a garden weedspraying backpack with the long lever manual pump handle was used to power a wobbler.

Bill

Martin Whittle27/01/2019 08:10:34
72 forum posts
5 photos

Even more simply one can use a bicycle pump for a quick demonstration. The speed is a bit erratic when pumping, but it works!

I used a schraeder valve body for the air connector on my Reeves Master HO. So the model is easily connected to a compressor, or a bike pump.

Martin

reeves master ho.jpg

Eric Cox27/01/2019 09:54:25
avatar
492 forum posts
24 photos

If you are unsure of your silver soldering capabilities why not buy a cheap Mamod system from flea bay or your local auction house. Don't forget to pressure test the boiler though.

BW27/01/2019 12:13:29
206 forum posts
36 photos
Posted by Eric Cox on 27/01/2019 09:54:25:

If you are unsure of your silver soldering capabilities why not buy a cheap Mamod system from flea bay or your local auction house. Don't forget to pressure test the boiler though.

Thanks, I always assumed they would be hideously expensive to buy and rarely available.

I will have a look.

I used a schraeder valve body for the air connector on my Reeves Master HO. So the model is easily connected to a compressor, or a bike pump.

Martin

Martin, thanks for the tip, I need to learn the names of various fiddly little things like "schrader valve body" and the different types of tubes and tube fittings etc

Bill

3404627/01/2019 14:43:11
350 forum posts
2 photos

BW

Mamod boilers are only very thin brass and there can be dezinc problems with them.

54mm copper tube from the plumbers merchants is ideal. I got a 3 foot offcut for £10 from mine, enough for 5 boilers.

My boilers are silver soldered and pressure tested to 60 psi and cost a lot less than a mamod one.

Have a go.

Bill

BW28/01/2019 22:44:45
206 forum posts
36 photos
Posted by Bill Chugg on 27/01/2019 14:43:11:

BW

Have a go.

Bill

Bill,

Thanks for the advice. Am having a go, investigating required tools and materials. Got some books ordered from library.

Will be quiet for a while then shout out after first boiler completed.

Bill

Paul Relf-Davies29/01/2019 12:56:39
68 forum posts
1 photos

I'm not sure where you are based, but you could do a lot worse than to sign up for the Society of Model & Experimental Engineers' 'Polly' course, starting in May (in South London). 

You will end up marvellous little vertical boiler & wobbler engine, plus get a great grounding in a wide range of model engineering techniques.

The ability to ask questions & get feedback on on you progress - plus getting your boiler properly pressure tested - is invaluable. You can't get that from books & videos  

P.

Full disclosure: I built this on the course last year...

polly.jpg

Edited By Paul Davies on 29/01/2019 12:59:50

BW30/01/2019 00:31:54
206 forum posts
36 photos

Thanks Paul that looks stunning.

Have applied to join Melbourne branch of SMEE

Bill

Paul Ainsworth12/02/2019 16:04:17
63 forum posts
7 photos
Posted by Bill Chugg on 27/01/2019 14:43:11:

54mm copper tube from the plumbers merchants is ideal. I got a 3 foot offcut for £10 from mine, enough for 5 boilers.

My boilers are silver soldered and pressure tested to 60 psi and cost a lot less than a mamod one.

Bill

What thickness end plates do you use?

Edited By Paul Ainsworth on 12/02/2019 16:47:39

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