To improve heat retention in MPO top stone in my quest of reaching Neapolitan Baking temperature with MPO, I inserted 4 layers of aluminum foil, between top stone and MPO ceiling to insulate and reflect back stone heat radiation. Without this foil, the air gap will only provide conduction and convection insulation for the top stone.
I also covered half of the bottom stone with one layer of foil, the inside half which gets much hotter.
I was able to get 700+ temperature top and bottom stones, temperature varied between front, back, center, left and right but all within 700+ range, did not reach 800+, it was little windy outside. I will try the experiment again on a non windy day. This weekend I will also try baking pizza at these high temperatures, may not be Neapolitan recipe.
I have other ideas on how to reach higher temperatures with MPO, this one is the simplest and the cheapest.
MPO has lots of potential, but it all depend on the initial lunch... Diffrent sizes, shapes and quality can be made to fit different users need. For the initial lunch, MPO will be based my current protoptype size, material and accessories. In addition to more experiment, I need to figure out price, Craig provided great input, regarding this...