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Bold machinery

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Pioneer

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    Posted: 06 January 2005 at 2:50pm
 Some interesting information has been forwarded concerning the power plants of both the Bold class vessels. Would there be anyone who could confirm that the Deltic's could not be run while the Gas Turbines were 'online' and visa vi?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote cducane Quote  Post ReplyReply Direct Link To This Post Posted: 06 January 2005 at 5:37pm
They had only two propeller shafts with some rather fancy gear boxes linking both drives which never really worked
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Pioneer Quote  Post ReplyReply Direct Link To This Post Posted: 06 January 2005 at 9:16pm
That could explain an ability to run the four power plants individually (or not as suggested). I have had discussion with some ratings of '1st crew' ( 'Bolds') and was told that they had four shafts but it was mentioned only as an aside to the main talking point, that of the boats actually being launched without the Gas Turbines fitted. Live and learn as they say
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Pioneer Quote  Post ReplyReply Direct Link To This Post Posted: 16 January 2005 at 5:17pm

Further info suggests that they were both launched with four seperate shafts and in the early days, after the fitting of the Gas Turbines, the original diesels, believed to be Mercedes, were exchanged for the Deltics and the 'fancy' gearboxes were fitted at the same time. That would make Lt Cdr Ben Warlow's observation correct, as stated in his book Minor War Vessels in Focus, and also confirm Crusader's statement.

Would anyone be able to confirm that? I know there are some 1st Crew 'bods' out there.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Timparr Quote  Post ReplyReply Direct Link To This Post Posted: 28 January 2009 at 11:32pm

Having just joined, I hope I might be able to help even on an old posting.

 

I actualy built Bold Pathfinder, and can confirm that she had four shafts, the inners were originally fitted with Mercedes Benz V20's form E Boats, and the wing shafts had Metro Vic Beryl gas jet engines fitted with a power turbine, which was connected to the shaft. The power turbines had troubles because the rotor was supported on overhung bearings, which were not stiff enough, and gave troubles.

Later we took out the Merceds engines and fitted 18 cylinder Deltics, as a test bed. The Deltics were so big that one had to be unshipped and moved outboard, in order to unship and lift the other. I do not think that it met the usual requirement to "change a main engine in less than eight hours.

It is sad to see her being broken at Pounds, I have a nice shot of her running trials at speed!

  Timparr

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Post Options Post Options   Thanks (0) Thanks(0)   Quote johnk Quote  Post ReplyReply Direct Link To This Post Posted: 02 February 2009 at 10:17am
Hi Tim,
 
Well, you can't beat the experience of the person who actually built a Bold! they are still breaking at Pounds? indeed, always a sad sight to see a vessel being broken, especially from "our" point of view her being a coastal forces craft, still good news HOPEFULLY re the 245, but still await confirmation on her of course.
 
Johnk 
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