71000 Duke fundraising efforts

Depends whether the defects were service induced or not. Laps in forgings we’re/are quite common.

 

Indeed, but to require a fourth new connecting rod after 26 years in service suggests something isn't quite right with the design.

 

Sounds interesting as mr Cox was full of praise for the BR8 design and he knew a little of troubles from inside conrods.
Can we have pictures?
If I remember OK, said items never gave trouble on Royal Scots,were disasters on Patriot or Jubilee and did a hard job on ca 2000 german BR44

 

Dare i mention the Ultimate Royal Scot Inside Conrod ? ( the roller bearing one)...

 

The Trust put this news in an email to members rather than on the website for anyone to see. I felt it reasonable to pass on the basic information but not the pictures, which anyway don't really tell us any more.

 

A bit naughty putting that on a public forum before it was officially announced. You are forgetting that 71000 had new connecting rods made in preservation to replace the missing three. The B.R. Standard Locomotive Owners Group had a batch of EN100 steel specially made many years ago and 20+ connecting rods for various Standard locos were forged and machined from the steel.

 

I am presuming that the Trust felt it appropriate to give the news to members rather than by a public announcement, as often with news about many preservation projects; but that's not the same as "Secret! Don't tell anyone". If I have overstepped they can tell me.
Yes I had forgotten about rods being missing (along with some other important components). It does explain one of the times when a new middle connecting rod was needed.

 

Is this written about somewhere?
Wild design is nice.
The germans tried on their last pacific BR 10 to use undivided roller bearing on a two part crankshaft and took it out after short time.
Sweden had it on some inside cylindered 2-8-0 and kept them in strategic reserve for many years.
Cannot have been all wrong.

WP_20230406_001[1] by Hermod posted Apr 6, 2023 at 12:00 PM

The dutch exile goverment took the gold along to UK and ordered some very advanced 0-8-0
and 4-6-0 from Sweden with three-cylinders and fireholes suited to best steam coal in 1943.
Roller bearing everywhere that had problems with water and the available coal after 1945 could not get through firehole.
Would be interesting if we could see some pictures of these swedish crankshafts.

 

Yes its written about in Under 10 cme's (part 2 ?) E.a. Langridge, might have had a mention in Powells book ( living with London Midland Locomotives) also
The final design worked to expectation but the fitting of the component in the first place being quite complex IIRC

 

I would suggest that the material used in the failed rod is tested in order to ascertain that it met the requested standard. The nature of the failure mechanism needs looking into. What, if anything, is known about the first failure?
If the modes of failure are not identical or similar then the material selection and rod design need further investigation and though this is costly it is not something that the movement cannot undertake. Revising and improving designs is not something new to us. US railroads were very conscious of the need to avoid surface damage to their alloy steel rods (Timken High Dynamic). Rods flex and knowing the causes of cracking and its propagation it is little wonder that they were careful.

 

I believe that the roller-bearing inside cylinder conn-rod and axle assembly removed from the DB Pacific 10.001 of 1957 is/was at the Deutsche Dampflok Museum at Neuenmarkt-Wirsberg. Seen here earlier on display at Kassel Hbf.

 

Lovely picture.
I have read the book about the two BR10s and it is really vague on why this wheelset was removed very early and a standard 01 solution was put under.
Anyway a standard Hirth spline would have been better and lower mass as well
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WP_20190802_002[1] by Hermod posted Aug 2, 2019 at 7:50 PM

 

Eric Langridge goes into quite a lot of detail on this, also covering the plain bearing system used on the LMS 3- and 4-cylinder engines.

 

Thank You and have ordered both books