Author Topic: Never underestimate the power of steam  (Read 2704 times)

Offline mklotz

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Never underestimate the power of steam
« on: August 04, 2012, 11:15:06 PM »
Saw this over on Chaski - a 5" gauge model locomotive pulling a seven ton actual size railroad car.


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Offline steamer

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Re: Never underestimate the power of steam
« Reply #1 on: August 05, 2012, 12:42:19 AM »
thanks for that Marv....Steam is a wonderous terrible thing isn't it!?



Dave
"Mister M'Andrew, don't you think steam spoils romance at sea?"
Damned ijjit!

Offline mklotz

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Re: Never underestimate the power of steam
« Reply #2 on: August 05, 2012, 12:53:03 AM »
thanks for that Marv....Steam is a wonderous terrible thing isn't it!?

Yeah, max torque at zero rpm.  None of this whiny 7000 rpm IC stuff before you start getting some power.

Oh, and BTW, it's spelled "wondrous".  (Sorry, couldn't resist.)
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Offline steamer

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Re: Never underestimate the power of steam
« Reply #3 on: August 05, 2012, 04:53:19 PM »
On Sabino...the engine room was run via a bell code.   Without going into that story...there was one code that meant "Emergency Astern"   The command amounted to taking the reversing lever and throughing the engine into astern while at full throttle ahead.   Full Ahead to Full astern in about 1-2 seconds.  never even touching the throttle!

That with a 48" diameter 4 blade bronze prop that weighs over 500 pounds turning at 150 rpm......if the 3.5" prop shaft doesn't break....your going backwards..... :o
"Mister M'Andrew, don't you think steam spoils romance at sea?"
Damned ijjit!

Offline Dan Rowe

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Re: Never underestimate the power of steam
« Reply #4 on: August 05, 2012, 05:13:32 PM »
Dave,
Your  forgot to mention a KEY thing what type of steam engine????

I had to respond to an emergency full astern bell while the ship was at full sea speed, but the engine was a 900mm bore low speed Sulzer diesel. That made the process of reversing the main engine different.

Dan

« Last Edit: August 05, 2012, 05:20:50 PM by Dan Rowe »
ShaylocoDan

Offline steamer

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Re: Never underestimate the power of steam
« Reply #5 on: August 05, 2012, 05:28:43 PM »
Sorry for that Dan!

A 7 x 14 x 12 fore and aft Payne compound.   We run 135psi saturated....about 75HP

But they're Clydsdale horsepower...not gerbal horsepower.....but you know that Dan. ;D

Dave
"Mister M'Andrew, don't you think steam spoils romance at sea?"
Damned ijjit!

Offline Maryak

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Re: Never underestimate the power of steam
« Reply #6 on: August 06, 2012, 12:22:12 AM »
On Sabino...the engine room was run via a bell code.   Without going into that story...there was one code that meant "Emergency Astern"   The command amounted to taking the reversing lever and throughing the engine into astern while at full throttle ahead.   Full Ahead to Full astern in about 1-2 seconds.  never even touching the throttle!

That with a 48" diameter 4 blade bronze prop that weighs over 500 pounds turning at 150 rpm......if the 3.5" prop shaft doesn't break....your going backwards..... :o

Yes, from Full Ahead to Full Astern, the steam recip engine has the quickest response, provided your damn quick with the lever and it, (if it's big enough), has a Browns reversing engine not all round reversing gear. Next comes the steam turbine although astern horsepower is normally a maximum of 1/3 ahead horsepower. A typical steam turbine powered destroyer would  stop in around 1.5 times its' length, (600-700ft) and reach maximum astern speed, (around 16knots), in 1.5 mins. A distant last comes a big direct acting 2 stroke diesel such  as Dan mentioned.

Best Regards
Bob
« Last Edit: August 06, 2012, 12:25:38 AM by Maryak »
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Offline steamer

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Re: Never underestimate the power of steam
« Reply #7 on: August 06, 2012, 01:42:03 AM »
Hey Bob,

Sabino just has a lever reverse for the Stevenson valve gear.    As fast as you can swing the lever.


Dave
« Last Edit: August 06, 2012, 02:01:36 AM by steamer »
"Mister M'Andrew, don't you think steam spoils romance at sea?"
Damned ijjit!