You might try Sketchup, a free download from google software, but you gotta have the latest windows operating system(as far as I know) for it to work properly, my windows Vista won’t work with it anymore. If you can take the time to learn how to use that program (might require days, even weeks)…it works very well as a sophisticated drafting program.
[quote=“josephhauler, post:1, topic:2066”]
unit to heat my house, my barn, and my pool
[/quote] Quite a lot of water it seems, and I think you said something about being a boilermaker…will you use coolant and an anode to avoid metal corrosion?
Also in your build pictures of the prototype, I guess the bottom of the Primary chamber is a flat brick floor, that covers the burn tunnel area, and allows a port in the brick floor somewhere along the way to let the gases flow into the burn tunnel, did you get a picture of that?
I think a metal grate of any kind, would probably not last very long.