Pictures of batch rocket test systems

[matthewwalker]

Oh, barrel gap is probably around 4" or so. I don't know for sure, but somewhere in there.

[stephenson1]

Matt. Do you have any insight as to whether or not I can use Portland I-A in a refractory mix?
I found this recipe in a backyard metal working forum;
www.backyardmetalcasting.com/refractories.html

I also found a local supplier that carries this I-A which has "air-entraining" additives. That sounds like more insulation to me.

For context, here is a link to the project I'll be tearing down and rebuilding:
www.youtube.com/watch?v=gHC4AI9JlU4

[pinhead]

Feb 28, 2013 8:29:13 GMT -8 matthewwalker said:

I'm using Fahrenheit on my IR thermometer. It's max reading is 1000* and it was over the threshold, so somewhere north of 1000*.

With both doors wide open it will smoke into the room, either through the P channel or the doors. It needs to be restricted some, how much depends on how hot it's running.

The dimensions of the front end are closer to that of a 6" system, feeding into an 8" riser. A few small deviations, but pretty close.


Edited to add: Riser is 31".

The only big deviation I see is post-barrel; Peterberg dumped directly into an exhaust stack and you're feeding through a "mass" before the chimney -- which is reducing draft, all-else being equal.

This reflects my experience with a 6-inch Peterberg stove; I have to cover the top half of the intake to prevent smoke-back. My burn box is made of uninsulated firebrick lined in cob and am feeding two half-barrel bells with an uninsulated chimney/stack.

This is to be expected, however, as Peterberg himself has mentioned it needs to be coupled to an "adequate" chimney to assist draft.

I'm just trying to figure out what is "adequate" to be able to run wide-open.

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[matthewwalker]

Pinhead, that's great insight. Makes a ton of sense to me, although I have that door so I don't consider the need to close it off a downside.

On another note, man, you are full of good ideas. I love the way you coupled the half barrel to the stove. That's a really easy way to make the junction, and is totally wide open and unrestricted. I'm using that! Thanks Pinhead.