franco b wrote:Insulating fire brick is great but can't stand the abuse it will get from coal. It will just abrade away. If in your design the exhaust gas circulates around the brick then insulating brick is little to no advantage over hard brick.
in the new design the gas will travel between outside of the steel firebox and the inside of the stove body, so i guess no advantage from the soft brick.
The Oak style base heaters do not circulate gas around the fire box.The brick only retards heat loss in the fire pot which is less effective than the design you contemplate.
yes, this new design is as close as i can get to a full suspended fire pot as is possible inside the original stove.
Your design sounds similar to the Vermont Castings 2310 which works pretty well but still lacks the superior air distribution of a round fire pot.
i tried long and hard to come up with a way to provide for a round fire pot, but it would have taken serious remodeling of the stove including the grates. the way i'm going now is simply an opening and redirecting of the gas path and the addition of a base chamber. very simple but, i believe will be quite effective.