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[quote]QUOTE: Originally posted by lupo Morning All! Hey Bob, about the chuffs; don't forget your motto![:D][:D] btw how do you know how many chufs per revoltution a a locomotive has to give? does that have to do with the cylinder arrangement? looking at real steamers I tried to figure out how many times they "chuff " could not quite figure that out ! [/quote] Hi Lupo: Their should be four chuffs per revolution on non-artilicated locos. Notice that the drivers are out of sync by 1/4 rev. At the end of the stroke the cylinders will let off the steam that has not been used to pu***he piston and that is the chuff. By having the drivers aout of sync by 1/4 rev you get at least three pistons putting out power all the time. Every 1/4 rev you also have a piston at max power which would be at the center of the stroke. Remember that the cylinders are producing power going both ways 'Ticks are a different story, some are compound which are mallets and others are simple. Malletts use the high pressure in the first set of cylinders and then pass it on to the other set of cylinders. This is the reason that the cylinders are different sizes. The low pressure cylinders have to be bigger then the high pressure cylinders to develop the same horse power since the steam isn't as high a pressure. Simple 'ticks could have as much as eight and as few as four chuffs per revolution, depending on weather the drivers were in sync, which is highly doubtful. Most of them would sound eight times a revolution and it would probably sound like a heart beat chuff, chuff, pause, chuff, chuff. The length of the pause and the speed of the chuff, chuff, would be determined by how the drivers were positioned in relation to each other. Remember that in real life, 'tick drivers are not all hooked to a common drive shaft. The reason that, under a heavy load, the steam engines would back up to start the train was they didn't have the power to start the whole train at once. Diesels on the other hand, start with almost full power. My dad told me that the first time they tested the first diesel with a max load they backed it up to put slack in the couplers and then roared off like a steam engine and succeded in pulling the coupler out of one of the cars, and deformed several other coupler mountings. I've been rather long winded and if I've left a stone unturned please let em know. Well I'm going back up-stairs and play some more. Ya'll have a blessed day and remember SANTA FE ALL THE WAY Bob BTW: I've owned this loco forever and the number of chuffs still doesn't bother me
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