David,
Easy..Type C boiler for 2 well made 9/16th bore cylinders.
2 inch Barrell . flues to be around 1/20th diameter of the length between
tube plates.the flues can be 1/2" diameter for barrell length of 10 to 12
inches..and 3 off them, for shorter barrell length 5 off 3/8"diameter
flues.. the wick area [top section]should be equal to or slightly larger
than the cross section area of the flues..dry firebox underneath can be
fixed by astrap silver soldered to the box and fitted with aClamp [similar
to a radiator hose screw clamp].this allows adjustment of the position on
assembly:
So 3 of 1/2" wicks match to 3 flues 1`/2" diameter..the area of air intake
[firebox] bottom should be between 3 and 4 times the wick area.
Gordon Watson.
----- Original Message -----
From: "David B. Orwig" <[email protected]>
To: "Small-scale live steam discussions" <[email protected]>
Sent: Wednesday, October 21, 2009 5:33 AM
Subject: Re: [SSLiveSteam] Boiler design question
> Great ideas so far. I have the book called "Model Boilers and
> Boilermaking" by K.N. Harris. It's more about the construction than
> design.
>
> I have thought about trying to overfire it and then capping or removing
> unneeded wicks. I've been scanning through Marc's locomotive of the month
> site as he often shows pictures of the underside of the engines. I saw one
> that had SIX wicks (Bowman 0-4-0T in 32mm) and then one of Larry Herget's
> designs (0-6-0T) (http://www.sidestreetbannerworks.com/locos/loco9.html )
> that had a cap hanging from a hand rail for use in warmer weather.
>
> Is it possible to have too many wicks in a confined space to preclude good
> combustion? If I have 4 wicks of, say 3/8 inch size, would I need 4 fire
> tubes of the same size? I'm rather more of an Edison guy than an Einstein
> guy. I was planning on mocking up the firebox out of tin can material and
> see what happens. Also, modifying (or building from scratch) a burner is
> much easier than modifying a boiler.
>
> Thanks for the replies, and keep 'em coming.
> Maybe I can have something going by Diamondhead time.
>
> Dave Orwig
>
>
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