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  #11  
Old 05-09-2012, 05:54 PM
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Originally Posted by atferrari View Post
Navigation in a vessel turbine propelled is remarkably smooth. And much less noisy!

Usually, only when giving half or full astern you can say what the engine is doing.

Good for sleeping.
Vessels at sea also make for a good game of tag.
http://www.youtube.com/watch?v=N4jQh...eature=related
http://www.youtube.com/watch?v=SME4w037FgA

This will wake you up.

4X http://en.wikipedia.org/wiki/General_Electric_LM2500
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Last edited by nsaspook; 05-09-2012 at 06:03 PM.
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  #12  
Old 05-09-2012, 08:36 PM
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Quote:
Originally Posted by atferrari View Post
Navigation in a vessel turbine propelled is remarkably smooth. And much less noisy!

Usually, only when giving half or full astern you can say what the engine is doing.

Good for sleeping.
I served on a nuclear submarine. Yes, it is smooth, but I don't have much other experience in the way of vessels to compare it to. When we would go all ahead emergency, the boat would do what I can only describe as "peeling out in the water" - it would shake and vibrate and groan and moan. It was fun. Super quiet too. over a billion dollars worth of technology, I am aiming my sights a little lower. I have a feeling that any type of steam turbine (other than possibilities with hobby jet engines and car turbos) is going to require significant mechanical engineering and access to high level tools. The piston engine however is doable with what I have in the garage,
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  #13  
Old 05-09-2012, 09:16 PM
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Have you looked into "Tesla turbines"?

But the piston type engine is the way to go for a vehicle, no separate gear box/transmission required. A turbine needs to spin at much too high a RPM to be used without a high ratio gear box to slow it down to usable wheel speed. Even the ships use a final drive before the prop, right?

The biggest reason gasoline engines survived and steam died in cars was the time it took to get a head of steam up to start to move. Gas was instant and took over the car market. With the new flash steam generators and electronic controls it could be a whole new ball game.
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Old 05-09-2012, 10:40 PM
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But the piston type engine is the way to go for a vehicle, no separate gear box/transmission required. A turbine needs to spin at much too high a RPM to be used without a high ratio gear box to slow it down to usable wheel speed. Even the ships use a final drive before the prop, right?
On US Navy gas turbine ships a double reduction gear shifts it down from about 14000 at the turbine to about 700 rpm on the main shaft with controllable pitch propellers that can adjust from full forward to full backward in seconds.

http://www.youtube.com/watch?v=lLSuWHvZzdU
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Old 05-10-2012, 01:54 PM
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Efficiency in any heat engine is fundamentally limited by thermodynamics. For all cycles the higher the input T ( for a given output T ) the higher the efficiency. The Carnot cycle is the most efficient.

In practical situations the turbine often wins in large part because it can with stand higher inlet temperature.
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Old 05-10-2012, 02:03 PM
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Quote:
Originally Posted by strantor
I have a feeling that any type of steam turbine (other than possibilities with hobby jet engines and car turbos) is going to require significant mechanical engineering and access to high level tools
Years ago, I read an article from a guy who built a steam trubo engine in his garage, using only good mechanical fabrication skills. He hammered out the "fins" -- for lack of knowledge of the proper term -- by hand. It was a single row of fins attached to a disk. He used it to power his DIY steam cleaner machine.

Maybe if you poke around a little, you might find the article archive or something similar. I forget where I read it; might have been Popular Mechanics or something like that.
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Last edited by Brownout; 05-10-2012 at 09:04 PM.
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