Trot Fox, A nozzle orifice can be too small or it can be too large! If it's too small there may be the velocity to create some pressure drop in the smoke box but not enought volume to be effective. Example, a 1mm orifice in a 1" scale loco wouldn't work very well!! The nozzle has to be just right to obtain the right blast and that is what Tony is writing about
Geoff. Interesting... I thought I had read that you should increase the nozzle >size to decrease the blast? Larger nozzle means slower jet speed and >therefore less draught, not to mention less restriction on the exhaust >taking up power. > >Guys? What's up with that? > >Trot, the somewhat confused, fox... > >At 05:30 PM 3/31/03, you wrote: >>Hi Geoff, >> Yes, you are correct. I did mean the exhaust nozzles. They both have >> in fact already been reduced once by Mike, to reduce the fierceness of >> the blast, which had caused the previous high temps, and blistered >> paint!. This weekend, with the red coals flying, the casing temperature >> was reading 286F. So I guess I am getting up there again, and you may be >> correct about the load. >> My track has some tight radii and "S" bends, plus 7 coaches at 50lbs+, >> engine at 28lbs, >>and a thick coating of white hot anthracite certainly makes the blast >>pipes bark.. Whereas on a large plain oval track, with the same load and >>constant momentum, the blast is much quieter. As to be expected. >> I have concerns about fitting a mesh screen after firing up, what is >> the melting point of facial skin!??. I guess I have to learn when to >>back off!. >> Have a great day. >> Best Regards, >> Tony D. > > > /\_/\ TrotFox \ Always remember, > ( o o ) AKA Landon Solomon \ "There is a > >\_/< [EMAIL PROTECTED] \ third alternative." >
