That's funny; I have been taking my two propane forges to teach with now about 10 times and the forced air forge goes through more than entire BBQ tank in a day while the aspirated forge still has gas left at the end of the day in it's tank every single time.
I'd say you can't make such comparisons without normalizing *all* the variables!
The forced air is sure a lot easier to use and tune and control atmosphere---it's the one I use for billet welding when I want to weld with propane.
If you want to go with forced air, scrap the air injection and make a real forced air burner; they are simpler to build and can use fairly small/cheap blowers rather than expensive air compressors.
__________________
Thomas
|