I have one simple question for all steamers: How many chuffs come out of one driver rotation on a 2 cylinder steamer? I thougt it is 4 chuffs or am I wrong? Greetings scopewime
Yes, 2 per side during one full rotation of driver is what one hears. So, chuff chuff is 180 Deg. of rotation. Next chuff chuff is 180 more degrees of rotation=360 Deg circle . ..I believe there are some exceptions though, like if there is a booster engine on pony truck or 3 cylinder loco (one cylinder in middle of frame). Not sure about that..
Yes this is what you would hear if you were to hear one side only. You should hear a chuff every 90 degrees of rotation as the drivers are 90 degrees apart from side to side. This is true only with two cylinder locomotives.
It is also true with articulated mallet locomotives, since the high pressure steam is only used once. The exhaust is a kind of muffled 4 per rotation, unless the engine crew has it "simpled up" for starting a train. A sound decoder that could simulate that would be really nice. Oh, and three cylinder examples would be the old Rivarossi IHB 0-8-0, which would have 6 chuffs per rotation.
