[TheForge] Foundry heat source

[Jerry Frost]

It doesn't make too much difference who's design you 
use as long as it's well tuned. There are only two 
basic types of induction device suitable for propane 
burners.

Linear inducers like the Bunsen, aussie, Reil, etc. can 
be identified by looking up the bore. The air intake 
and jet are in line, basically you can look through 
them like a telescope. A commercially designed linear 
will produce a max induction of 19:1. (gas to gas, if 
you use a liquid through the jet induction goes up, if 
you're inducing a liquid induction goes down.)

A jet ejector type burner like the: Fisher, Porter, 
Rex's series, sidearm, "T" jet, etc. have the air 
intakes at 90* to the jet. A commercially designed jet 
ejector will induce a max of 29:1. (gas to gas)

Don't ask me why simply moving the air intakes makes so 
much difference to the induction rate, I don't have any 
idea. What it means for us is a more efficient and 
easier to make burner. If you build a linear you have 
to hit it pretty darned accurately to get a 16:1 ratio 
for a neutral burn. If you build a jet ejector you have 
a LOT of tolerance to play with. I like easy. <grin> 
This is why such crude designs as the "T" jet and 
Sidearm work so well, there's just a lot of room to 
play with.

What Mike is talking about is a different kind of 
forge, not burner. His first attempt proved a point 
Mike Porter had been trying to make for some time. 
Namely that a well made naturally aspirated propane 
burner will easily burn in excess of 3,000f.

The other points about insulation and general design 
are as important in their own way. If you can't hold 
the heat you can't use it. Still, not being able to 
achieve more than 2,400f from a naturally aspirated 
burner is a myth. It's a persistant myth but a myth 
none the less.

Frosty
-------------------------------
If it ain't forged
it ain't real.
Wrought iron is.
The FrostWorks

Meadow Lakes, AK.

http://www.artmetalradio.com/

From: "Jerry Smith" 
<jerry_smith at anvilsandinkstudios.com>


> Frosty,
>
> Don't worry I am going to build mine from your basic
> plans.
>
> Jerry