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From: "Jim Wilkins" <muratlanne@gmail.com>
Newsgroups: rec.crafts.metalworking
Subject: Re: boat propulsion - miniature computer-controlled steam plant?
Date: Sat, 23 Mar 2024 09:20:34 -0400
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"Richard Smith"  wrote in message news:m11q81xrlp.fsf@void.com...

Also - apparently - the steam-turbine ships as very quiet and smooth -
if as family of someone to do with the Company you get invited to be
passengers on a voyage you go on a steam-turbine ship.

-----------------------------

They are when properly balanced. Mauritania's weren't and when on a speed 
record run the stern cabins were uninhabitable.

Olympic's turbine was significantly worn in a decade.
https://www.encyclopedia-titanica.org/an-olympic-class-propulsion-system.html

Notice that the turbine produced more power than one recip although its 
steam entry pressure was below atmospheric, 9 PSIA / 188F, the condenser 
reduced it to 1 PSIA / 102F. The two compound engines reduced daily coal 
consumption to about 60% of the smaller, faster all-turbine Mauretania and 
Lusitania, which were intended to and did capture and own the speed record, 
while Olympic, Titanic and Britannic were optimized for economy at 22 
instead of 26 knots.

Titanic wasn't quite at full steam pressure or speed and couldn't possibly 
break the speed record. The captain had diverted south of the ice reports 
and was following the standard practice of relying on lookouts plus the 
bridge watch (which did have binoculars) to see something large enough to 
damage the ship, which could turn almost as sharply at full as reduced 
speed, but a temperature inversion mirage due to the ice field intruding 
into the warm Gulf Stream -may- have hidden the berg until too late, and 
also caused their unusually inaccurate SOS report longitude. A mirage that 
raised the observed horizon and hid or distorted ships and the iceberg on it 
could explain many of the lingering questions.
https://en.wikipedia.org/wiki/Fata_Morgana_(mirage)

https://www.titanicology.com/Titanica/Mistakes.pdf
Compare the size of the errors in longitude to latitude. The sinking 
location is that of the tight cluster of coal and boilers released at hull 
breakup. Carpathia's claim of great speed was based on assuming the 
lifeboats were at the incorrect position an hour further west.  Mauretania 
burned 1000 tons per day on an early speed run, before improvements.

Intense interest in Titanic, especially after discovery revealed many wrong 
assumptions, has made much more detailed information on ship design, 
construction and operation of the time available than for other vessels with 
less dramatic and unexplained fates. Eyewitness accounts vary substantially 
for an event where unlike a crime most had nothing to hide.