Picked up an air tank a week or so ago.....just your garden variety Craftsman compressor tank. Trying to figure out some of the math using the calculator that is found here....

Some of it is pretty much a no brainer...I have not cut the tank open yet so I just plugged in the number I got from Feldons calculator which was 13860 cubic inches.

Took that number and used x.004 to come up with 55.44 square inches to come up with the FB/CC opening.

Took 13860x..004 again to come up with 55.44 square inches...for the area under the RF plate....

Took 13860 X 0.004 = 55.44 square inches....area required at the end of the RF plate in square inches

Took 13860 X 0.33 = minimum volume of the Fire Box...which is 4573.8 cubic inches....

Is all of the above correct? Which leads me to my first of what will no doubt be a truck load of questions...which is a better firebox design....taller than wide? wider than tall? Assuming that depth is more or less a non -issue....and to a point is determined by what length of firewood will be used? This is of course keeping the length in line with keeping the FB the right size. Should the FB be no wider than OD of the tank?

Not even going to look at the circle part of this...my head is already spinning...