Fellows , >> Won't crimping the steam exhaust tube in the stack reduce the pull over the >> firebox? I mean I'm all for a good plume and a loud chuff, Our little dragons are quite powerful , The crimping of the exhaust actually tames the performance and does not lessen pull . I also posit that I get a longer run time as my steam doesn't "freewheel" up and out .. I need less fire cause my steam is not leaving as fast , the boiler pressure remains higher creating "hotter" steam .. More latent heat .. engineering term .. I also put a hole in the pipe on my cricket down near the engine to allow some steam to escape there which looks very nice as the thing waddles along blowing steam in several directions .. Have Fun - Charley
