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Offline Mr. Ron  
#1 Posted : 19 December 2022 07:57:31(UTC)
Mr. Ron

United States   
Joined: 05/07/2020(UTC)
Posts: 311
Location: Mississippi, Vancleave
Can you explain how a 3 cylinder steam locomotive works? I don't understand how the valves open/close with each stroke. I can understand the stroke cycle of a 2 cylinder engine, but not a 3 cylinder.
Offline PerR  
#2 Posted : 19 December 2022 08:07:05(UTC)
PerR

Denmark   
Joined: 19/05/2014(UTC)
Posts: 41
Location: Sjælland, Kirke-Hyllinge
A steam locomotive with more than two cylinders have one or two cylinders in the middle of the frame and pointing forward and can be seen below the boiler at the front of the locomotive. The extra cylinders are normally high pressure cylinders and the valves are working independent of the two cylinders outside of the frame.
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Offline H0  
#3 Posted : 19 December 2022 11:12:29(UTC)
H0


Joined: 16/02/2004(UTC)
Posts: 15,254
Location: DE-NW
Originally Posted by: Mr. Ron Go to Quoted Post
I can understand the stroke cycle of a 2 cylinder engine, but not a 3 cylinder.
With 2 cylinders, there is an angle of 90° between the rods and there are four chuffs per revolution, two from each cylinder (unless it is a compound engine). With 3 cylinders, the angle is 120° and there are six chuffs per revolution, two from each cylinder.
Cylinders work just the same.

Regards
Tom
---
"In all of the gauges, we particularly emphasize a high level of quality, the best possible fidelity to the prototype, and absolute precision. You will see that in all of our products." (from Märklin New Items Brochure 2015, page 1) ROFLBTCUTS
UserPostedImage
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Offline mvd71  
#4 Posted : 19 December 2022 18:45:46(UTC)
mvd71

New Zealand   
Joined: 09/08/2008(UTC)
Posts: 1,710
Location: Auckland,
Originally Posted by: H0 Go to Quoted Post
Originally Posted by: Mr. Ron Go to Quoted Post
I can understand the stroke cycle of a 2 cylinder engine, but not a 3 cylinder.
With 2 cylinders, there is an angle of 90° between the rods and there are four chuffs per revolution, two from each cylinder (unless it is a compound engine). With 3 cylinders, the angle is 120° and there are six chuffs per revolution, two from each cylinder.
Cylinders work just the same.



Are you sure about the angles??
Offline H0  
#5 Posted : 19 December 2022 19:00:23(UTC)
H0


Joined: 16/02/2004(UTC)
Posts: 15,254
Location: DE-NW
Originally Posted by: mvd71 Go to Quoted Post
Are you sure about the angles??
Those are the most common angles, but their may be others.
Angles are different for three-cylinder compound engines, but there are not many classes of that type.

I think this picture shows it quite well (BR 44):
UserPostedImage
Regards
Tom
---
"In all of the gauges, we particularly emphasize a high level of quality, the best possible fidelity to the prototype, and absolute precision. You will see that in all of our products." (from Märklin New Items Brochure 2015, page 1) ROFLBTCUTS
UserPostedImage
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Offline mvd71  
#6 Posted : 19 December 2022 20:17:35(UTC)
mvd71

New Zealand   
Joined: 09/08/2008(UTC)
Posts: 1,710
Location: Auckland,
Ok, perhaps the description is not entirely clear. A two cylinder loco has the pin on the driving wheels offset by 90/270 degrees which gives a power stroke from the cylinder every 90 degrees (because they are double acting.

The three cylinder loco has an even spaced 120 degrees giving a power stroke every 60 degrees.

At least that’s what my brain is thinking when fueled by only one coffee!
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