3 1/2 inch Gauge Merchant Navy Live Steam Locomotive
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- Опубликовано: 6 окт 2012
- A full lap of Walton Park track in Sale.
The Engine was built by the late Len Gillett. He used the drawings for L.B.S.C's. 3½ pacific that he named 'Pamela'. This design was based on the rebuilt version of the Merchant Navy class, with two cylinders and outside Walshaerts valve gear. These drawings gave the correct dimensions for the frames and all the details to be able to produce the chassis. Brian Haresnape's book on Bulleid locos helped a lot with other detail, as it did also with the casing around the boiler, the cab and the tender.
For the cylinders he used a set of slide valve castings as sold for L.B.S.C.'s 'Hielan Lassie' which gave me the correct three cylinders. Not wanting to get involved with chain driven valve gear, he decided that Stephensons valve gear would be the most suitable, especially as at that time Martin Evans was describing Stephenson valve gear for his 'Torquay Manor'.
By scaling down the 5" gauge dimensions, he was able to fit the outside cylinder eccentrics on the crank axle, and the inside cylinder eccentrics on the rear axle.
The outside cylinder valve gear passes through the frames to the crossheads supported by bronze pads making a very robust fitting. The driving wheels were from A.J. Reeves castings of the Bulleid Firth Brown design.
When it came to making the boiler he followed the 'Pamela' drawing.
To look correct the chimney diameter needed to be much larger than specified for 'Pamela', this meant that he had to make a multi-jet blast pipe with 5 nozzles to spread the exhaust to fit the chimney.
The engine and tender were completed by late summer 1978, the engine weighing in at 42 kgs and the tender a further 12 kgs. 
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Very nice. Looks like it ran well. Would like to see a more modern video now. I’m in the process of rebuilding a Blackmore Vale in 3.5” which started its life as a Pamela and then had a 3rd cylinder added and the external casing added.
I love the live steam locomotives :)
What a beautiful machine :)
Love this ! I've always had a love of the merchant navy and battle of Britain class engines...Stevie b
That’s cute, I’d like one of these little Bulleid Pacifics in 7 1/2 inch gauge.
No, it has inside Stephenson driving all three valves.
Read about this loco, really impressed with performance. Looks like a bit more than 6mph too. Planning a modified at the moment. Well filmed.
Hi Billy, yes this is Jason. We had difficulty getting James off lol
Yes another one of mine :-)
What a lovely loco, I would swap my wife for that!
thanks for sharing, would love to see it from all angles
does it have the chain driven valve gear?
hi is this jason? Its billy that drives the 9f at urmston. I hear that james tilbury had a good stint on this engine on the sunday of the 40th anniversary. billy
wow she looks great, a nice bit of wheel spin. how much did she cost?
Saw one of these at the Birmingham sme gala last year was this the same loco?
Another one of yours of a visiting engine?
You'd do a better job by showing the locomotive before or after the run from the front and from both sides. This way is frustrating to the viewer.
Hi Paul Lubliner, this is one of my early videos and agree different angles are needed, if you compare it to my more recent films I now use different views, take a look at the one from yesterday of a 3 1/2" Black 5 for example. I don't pretend to be a film maker, my hobby is model engineering.
Rebuilt Merchant Navy is a 3 cylinder loco.
He is referring to LBSC's 'Pamela' pacific, which is a two cylinder machine, but following the external outline of the rebuilt MN's. When building models in this scale you cannot exactly replicate the mechanics, so you replicate the outline and modify the mechanics for the practicalities of construction and operation. Hence, this model, although three cylinders, has different valve gear from the full size prototype.