carusoam Posted May 11, 2020 Report Posted May 11, 2020 My first internet search... AOL in the 90s... connected by a telephone.... What makes a steam locomotive engine ‘chug’... You can hear the sound when it happens but visibly it is not related to what is going on outside... I don’t think I ever found the answer... Best regards, -a- Quote
ShuRugal Posted May 11, 2020 Report Posted May 11, 2020 Wild guess at what the chugging sound is: inrush of steam to cylinder when the cutoff valve is set for full-stroke inlet while pulling off from a start? As the train speeds up and the wheels turn faster, the position moves quicker, so the duration starts as long gasping chugs, then progresses to shorter faster chirps as the valve timing is advanced?Completely guessing, here. Quote
N201MKTurbo Posted May 11, 2020 Report Posted May 11, 2020 11 minutes ago, ShuRugal said: Wild guess at what the chugging sound is: inrush of steam to cylinder when the cutoff valve is set for full-stroke inlet while pulling off from a start? As the train speeds up and the wheels turn faster, the position moves quicker, so the duration starts as long gasping chugs, then progresses to shorter faster chirps as the valve timing is advanced? Completely guessing, here. You are pretty close. With the Johnson bar full forward, it will admit full pressure steam for the whole stroke of the piston. This does not let the steam expand, so when the exhaust port opens it exhausts full pressure steam with a loud “Choo”. This situation produces a huge torque at the expense of wasting a huge amount of steam. This setting is used for pulling away from the station and climbing steep grades. Once the locomotive gets going, the Johnson bar is pulled back, reducing the amount of stroke where steam is admitted, reducing the choo choo sound and the amount of steam needed to Keep the train going. Usually this reduction is done at full throttle, so full boiler pressure is applied to the valves. The fireman will try to keep the boiler pressure just below the relief valve pressure, or sometimes venting steam out of the relief valve. For the fastest speed. 1 Quote
DXB Posted May 11, 2020 Report Posted May 11, 2020 Wasn't there some kinda Frankenstein Mooney long body creation that had a J bar? I think flying in Australia or South Africa or something? I kinda recall a thread on it quite a while back. There needs to be an STC that can convert the modern planes to manual gear - the system is way cooler than having cupholders and armrests. 1 Quote
cctsurf Posted May 12, 2020 Report Posted May 12, 2020 On 5/11/2020 at 12:02 AM, DXB said: Wasn't there some kinda Frankenstein Mooney long body creation that had a J bar? I think flying in Australia or South Africa or something? I kinda recall a thread on it quite a while back. There needs to be an STC that can convert the modern planes to manual gear - the system is way cooler than having cupholders and armrests. Sounds great! I'd give up cupholders and armrests for the reliability of the manual gear... 'course I'm nowhere near affording one of those long-body mooneys, so it wouldn't help me, but its nice to dream. Quote
MoonFlyer68 Posted May 15, 2020 Report Posted May 15, 2020 Out of curiosity, what do you estimate the change in weight was for the plane? Quote
Culver LFA Posted May 15, 2020 Author Report Posted May 15, 2020 35 minutes ago, MilitaryAV8R said: Out of curiosity, what do you estimate the change in weight was for the plane? 13.4lbs Quote
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