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Lmao. Definatly no chuffing.  As for what she sounded like..... its hard to guess exactly. I don't know what the size of the turbine was or what gear reduction ratio was used. The fact that it was direct drive, and capable of over 100 mph yet consumed enormous amounts of fuel at lower speeds tells me they didn't use enough gear reduction thus spinning the turbine at a slower then nominal speed. Variable vanes would have solved the problem but they didn't have them..... that said, my guess is that lionel's scale turbine sound is accurate for the slow speed but mth's turbine sound is more accurate for higher speeds. Since it is direct drive without variable vanes the turbine's speed and sound will constantly increase with driver speed

The 6200 top speed was limited to 110 mph by the turbine [overspeed trip] cutoff.

During the initial runs the throttle was prone to stick in the open position, causing some panic in the cab. This problem was corrected when returned, I think to Eddystone.

The modification to the throttle design still did not completely correct this problem.

I read somewhere years ago that there is a sound recording of it. I have never heard it. I believe that it was either lionel or mth that claimedto have used this clip when they made their S2. I will have to email each to see what they say.  As for the actual sound of a steam turbine locomotive: I bet it was similar to this swedish steam turbine locomotive:
http://youtube.com/watch?v=ZsrzUjcHeAs
Originally Posted by david1:

Of course it's appetite for fuel doomed the turbine 6200 to be the only one built. 

The reason the S2 project was dropped, which would have been Class R 4-8-4, was the expected increase in efficiency at speed was not achieved, diesels not withstanding.

The designers knew at low speed  [below 10 mph] the turbine would have an efficiency problem. The S2 was designed and constructed on a tight budget made worse by war time restictions on the Metallurgy available. Added cost was the principal reason for dropping the booster from this project. The booster would hve helped the starting problem below 10 mph.

The S2 was an experimental engine to determine the efficiency  of a direct drive turbine at speed. An expected increase of 4 to 6 percent over the conventional steam engines was not achieved and further consideration was dropped. .





Originally Posted by Stuart:

There was a direct drive steam turbine built in England before WWII which used multiple nozzles to control the speed of the turbine instead of a throttle.  From what I read it was reasonably successful.  Perhaps the S2 would have been better if the Pennsy tried that method.

 

Stuart

The S2 turbine had four nozzles.

Originally Posted by Stuart:

There was a direct drive steam turbine built in England before WWII which used multiple nozzles to control the speed of the turbine instead of a throttle.  From what I read it was reasonably successful.  Perhaps the S2 would have been better if the Pennsy tried that method.

 

Stuart

I spent over 26-years in the electric power industry around turbines from 1,716,506 HP to much small used to drive Feed-Water and Reactor Charging pump.  They ALL had nozzle blocks made up of FOUR sets of INLETs evenly directed steam around the circumference of the moving turbine blades. And then you have a nozzle like structure that redirects steam from each rotating blade set onto the next rotating blade set.

Originally Posted by Rusty Traque:
Originally Posted by Balshis:

Given the amount of time and money the PRR spent on the S2 project, it's amazing that there weren't more films of it made in action.

If it would have been successful, there would have one heck of a PRR promo film made.

 

Rusty

I wasn't talking about promo films, though.  I had in mind films made for the engineering department's use during its evaluation runs.

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