Engines > From Kits/Castings
2.5" Gauge Green Arrow Build
Charles Lamont:
--- Quote from: crueby on October 22, 2025, 02:33:54 PM ---Had to look up that engine, I never knew they did 3 cylinder locomotives like that. Was that engine unique, or was that a fairly common thing?
--- End quote ---
Like what? I am not sure what you are asking.
crueby:
--- Quote from: Charles Lamont on October 22, 2025, 02:50:16 PM ---
--- Quote from: crueby on October 22, 2025, 02:33:54 PM ---Had to look up that engine, I never knew they did 3 cylinder locomotives like that. Was that engine unique, or was that a fairly common thing?
--- End quote ---
Like what? I am not sure what you are asking.
--- End quote ---
Having a third cylinder in the center of the frame, rather than just one either side in line with the driving wheels.
RReid:
I find the Green Arrow to be a very handsome locomotive, and yours appears to be coming along great. I keep a digital copy of Martin Evans' Model Engineer build series for a gauge 1 version, just in case...
uuu:
--- Quote from: crueby on October 22, 2025, 02:33:54 PM ---Had to look up that engine, I never knew they did 3 cylinder locomotives like that. Was that engine unique, or was that a fairly common thing?
--- End quote ---
There were quite a few three cylinder designs in the UK. And a few in other countries. The challenge on many types was not how to connect the crank of the middle cylinder, but how to drive the valves. There were "conjugated valve gears", using the motion of the valves of the two outside cylinders in combination to drive the middle one. Here's an article on one such system: https://en.wikipedia.org/wiki/Gresley_conjugated_valve_gear
Wilf
crueby:
--- Quote from: uuu on October 22, 2025, 03:55:28 PM ---
--- Quote from: crueby on October 22, 2025, 02:33:54 PM ---Had to look up that engine, I never knew they did 3 cylinder locomotives like that. Was that engine unique, or was that a fairly common thing?
--- End quote ---
There were quite a few three cylinder designs in the UK. And a few in other countries. The challenge on many types was not how to connect the crank of the middle cylinder, but how to drive the valves. There were "conjugated valve gears", using the motion of the valves of the two outside cylinders in combination to drive the middle one. Here's an article on one such system: https://en.wikipedia.org/wiki/Gresley_conjugated_valve_gear
Wilf
--- End quote ---
Thanks Wilf!
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