Paul_sterling Posted June 24, 2019 Share Posted June 24, 2019 3 minutes ago, TheSignalEngineer said: Using speed and wheel circumference I would estimate that 90mph on a 9F would be equivalent to approximately 120mph on an A4 at the same rpm. Just checked, and I agree. I'm correct in respect of the quote, but the quote is incorrect. thanks. Paul. Link to post Share on other sites More sharing options...
atom3624 Posted June 24, 2019 Share Posted June 24, 2019 Good information. Wasn't the Bulleid boxpok design said to be lighter - less inertia / momentum when running? As you say, the tyres may have been a limiting factor. I've read the same regarding the 6' 2" wheels - dimension applies to Blue Peter and Bulleids as well as Brits I suppose so we must have read the same book somewhere - I did have a fair amount of OS Nock in my distant past!! I would be more concerned of piston speeds for the reciprocating gear - and 'breathing'. Wonder what Coronation would have reached then .... ??? !!! We're all allowed to 'let's suppose' once in a while. Al. Link to post Share on other sites More sharing options...
RMweb Premium melmerby Posted June 24, 2019 RMweb Premium Share Posted June 24, 2019 I have read that the claimed maximum wheel speed at over 90mph* for one of the 9Fs was at around 8.8 revs a second, the same as Mallard at 126mph. *Might be a bit of an exaggeration? As an aside the GWR was going the same way re wheel size, as the County was intended as a simpler & cheaper replacement for a Castle and had 6' 3" wheels. This was an unlikely precedent to the similarly power rated Britannia. Link to post Share on other sites More sharing options...
atom3624 Posted June 24, 2019 Share Posted June 24, 2019 I suppose as time went on, designers were looking at axle loading permitted versus tractive effort / acceleration out of stations to try and speed throughput. Never looked at County Class locos the same way I do Castles TBH - just don't look as impressive. Al. Link to post Share on other sites More sharing options...
Steamport Southport Posted June 24, 2019 Share Posted June 24, 2019 Different eras and needs. There was no need for speed in post war Britain. The infrastructure was terrible after six years of neglect due to war. Hence the reason there was no "top link" express passenger locomotives in the BR Standards*. 71000 was an after thought only allowed due to the demise of 46202. * Britannias were mixed traffic officially. 7MT. Jason Link to post Share on other sites More sharing options...
RMweb Gold TheSignalEngineer Posted June 24, 2019 RMweb Gold Share Posted June 24, 2019 Agreed, Jason. We already had 50 Stanier Pacifics, 30 Kings and lots of Castles, the Merchant Navies and Gresleys Pacifics which could all run heavy expresses at speeds in excess of those permitted right across the system until the late 1950s. What was needed was to get rid of the mass of non-standard bit and pieces often inherited from pre-grouping companies. I doubt many of those would have lasted past 1950 had the war not interrupted building programmes of the Big Four in favour of military equipment. Link to post Share on other sites More sharing options...
robmcg Posted June 25, 2019 Share Posted June 25, 2019 9 hours ago, atom3624 said: Good information. Wasn't the Bulleid boxpok design said to be lighter - less inertia / momentum when running? As you say, the tyres may have been a limiting factor. I've read the same regarding the 6' 2" wheels - dimension applies to Blue Peter and Bulleids as well as Brits I suppose so we must have read the same book somewhere - I did have a fair amount of OS Nock in my distant past!! I would be more concerned of piston speeds for the reciprocating gear - and 'breathing'. Wonder what Coronation would have reached then .... ??? !!! We're all allowed to 'let's suppose' once in a while. Al. For what it's worth in the context of wheel diameters and speed, Andre Chapelon had planned a 232 or 4-6-4 for post-war France and he chose 7'3" for drivers with a envisaged top service speed of 200km/hr. I believe he knew a thing or two about steam engineering including breathing and economy, too. The designs were mentioned I think in Col. H.C.B.Rogers' book 'Chapelon. Genius of French Steam' Most of his plans were thwarted alas by the SNCF going electric... mind you, 205mph by 1955 with electrics wasn't half bad! Or for that matter the more recent, what was it, 560-something km/hr ? A lot of metallurgical knowledge and electrical power there! thread drift warning ... but entirely to do with Bugatti-nose P2s. ! Link to post Share on other sites More sharing options...
DonnyRailMan Posted June 25, 2019 Share Posted June 25, 2019 If / when Hornby produce a P.O.W. P2 is going to look much different in appearance to Cock O The North. Will it be fitted with the external pump system on front righthand side. Link to post Share on other sites More sharing options...
atom3624 Posted June 25, 2019 Share Posted June 25, 2019 (edited) Like 70000 Britannia? If/when Hornby model it, there are scale Westinghouse pumps. I fitted one to the front of my Hornby Britannia. Al. Edited June 25, 2019 by atom3624 1 Link to post Share on other sites More sharing options...
jwealleans Posted June 25, 2019 Share Posted June 25, 2019 No. 2001 was fitted with an ACFI feed water heater when built. It's visible in the first photo on this page. The LNER tried these on a number of different locomotives - several B12s, 2 A1/3s and (I think) a J6. The apparatus was removed from all of them by early in the Second War. Link to post Share on other sites More sharing options...
Paul_sterling Posted June 25, 2019 Share Posted June 25, 2019 17 minutes ago, jwealleans said: No. 2001 was fitted with an ACFI feed water heater when built. It's visible in the first photo on this page. The LNER tried these on a number of different locomotives - several B12s, 2 A1/3s and (I think) a J6. The apparatus was removed from all of them by early in the Second War. in 2001's case, when it was rebuilt to conform with the rest of the class. P. Link to post Share on other sites More sharing options...
atom3624 Posted June 26, 2019 Share Posted June 26, 2019 (edited) PoW exposed - some background and update aired on 'local' BBC news ... https://www.bbc.co.uk/iplayer/episode/m0006cv3/look-north-yorkshire-evening-news-25062019?fbclid=IwAR1HNyne3U4NqepdbKYueCeu3zjB22nn9nY8WRS5ldB2jEJVQHg-cYLl9ns Go to 21' 39" .... link is to quite a long programme, sorry. Al. Edited June 26, 2019 by atom3624 Link to post Share on other sites More sharing options...
DonnyRailMan Posted July 4, 2019 Share Posted July 4, 2019 The P2 Quartet. The far left P2 is the origianal TTS Version. Next is the gloss coated version now fitted with TTS. The next two are both R3207 version now both TTS fitted . All the four P2s are now fitted with X9108 5 pole motors. 3 Link to post Share on other sites More sharing options...
RMweb Premium Hilux5972 Posted July 5, 2019 RMweb Premium Share Posted July 5, 2019 Why on earth would you need 4 of the same loco lol 1 Link to post Share on other sites More sharing options...
No Decorum Posted July 5, 2019 Share Posted July 5, 2019 3 hours ago, Hilux5972 said: Why on earth would you need 4 of the same loco lol Especially given the P2s shortcomings, although DonnyRailMan has dealt with one of them (the motor). Link to post Share on other sites More sharing options...
bigwordsmith Posted July 5, 2019 Share Posted July 5, 2019 I bought 2 - one for the sake of it, and one to hack around Link to post Share on other sites More sharing options...
DonnyRailMan Posted July 5, 2019 Share Posted July 5, 2019 4 hours ago, Hilux5972 said: Why on earth would you need 4 of the same loco lol For starters it's my railway and two of them are to be renamed. And there will be a other one could be coming to have a make over done on it. Similarly to the projects I have had done in the past to other locos. A d it dose not bother me if the are right or not right as some people say. 1 Link to post Share on other sites More sharing options...
Coach bogie Posted July 5, 2019 Share Posted July 5, 2019 23 minutes ago, bigwordsmith said: I bought 2 - one for the sake of it, and one to hack around Me too, especially as the second one came with a complete trainset for £70 in an online Black Friday sale! Sold on, the individual parts of the train set and ended up with a loco for £30 Mike Wiltshire 1 Link to post Share on other sites More sharing options...
RMweb Premium Hilux5972 Posted July 5, 2019 RMweb Premium Share Posted July 5, 2019 I was joking dude. I’ve got 3 5972. And will have 2 more when they are released this year. Didn’t mean to offend. 1 Link to post Share on other sites More sharing options...
DonnyRailMan Posted July 5, 2019 Share Posted July 5, 2019 13 minutes ago, Hilux5972 said: I was joking dude. I’ve got 3 5972. And will have 2 more when they are released this year. Didn’t mean to offend. Same here did not mean to offend you either. My 5th P 2 is going to be the railroad version and will be done in War Time Black. Also will be fitted with TTS a d be fitted with the X9108 motor. Plan is end of year / new year . Link to post Share on other sites More sharing options...
atom3624 Posted July 5, 2019 Share Posted July 5, 2019 I can think of less interesting locomotives to have 4, now 5 of .... Why not add 2 more and you've got the lot? !! PoW!! (As they say) Al. 1 Link to post Share on other sites More sharing options...
RMweb Premium Hilux5972 Posted July 5, 2019 RMweb Premium Share Posted July 5, 2019 I’m looking forward to Hornby releasing the P2 as 2007. Hopefully with a completely reengineered super detail version! 1 Link to post Share on other sites More sharing options...
Paul_sterling Posted July 5, 2019 Share Posted July 5, 2019 1 hour ago, atom3624 said: I can think of less interesting locomotives to have 4, now 5 of .... Why not add 2 more and you've got the lot? !! PoW!! (As they say) Al. I love it! 1 Link to post Share on other sites More sharing options...
DonnyRailMan Posted July 5, 2019 Share Posted July 5, 2019 1 hour ago, atom3624 said: I can think of less interesting locomotives to have 4, now 5 of .... Why not add 2 more and you've got the lot? !! PoW!! (As they say) Al. I'm thinking of even doing a 2008 name it after a town that was on the P2s line / route. Link to post Share on other sites More sharing options...
Tramshed Posted July 5, 2019 Share Posted July 5, 2019 On 25/06/2019 at 13:08, DonnyRailMan said: If / when Hornby produce a P.O.W. P2 is going to look much different in appearance to Cock O The North. Will it be fitted with the external pump system on front righthand side. Discussion about a model of 2007 prompted me to look back over my file of photos. Admittedly not in OO scale this was taken (somewhere!) by my late father. The film was processed in March 1964. Probably taken in the Lincolnshire area but just possibly in Hertfordshire. Any info welcome but interesting that whoever made this did it in original (non 'Bugatti') style and anticipated the 'real' 2007 by 55 years! 2 Link to post Share on other sites More sharing options...
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