{"product_id":"1-12-inch-scale-allchin-traction-engine-stock-code-1882","title":"1 1\/2 inch scale Allchin traction engine","description":"A well-made Allchin traction engine to the W.J.Hughes design  for \"Royal Chester\". Widely-regarded as the first close-to-scale  drawings produced for a model traction engine, Hughes had access to the  full-size engine in the 1950s (an engine now in preservation) and produced a  highly detailed design which remains extremely faithful to the original. Written  up in the \"Model Engineer\", Hughes subsequently published the  construction articles as a book which is still available.    \u003cp\u003eAlthough often tackled by newcomers to model engineering attracted by its  modest size, the design calls for a considerable amount of experience to build  successfully, both in the ability to tackle complex individual parts and also to  cope with the sheer quantity of bits - basically if it was on the original  engine, it appears on the model. As a result of this, we see a good number of  Allchins which are not all they could be(!).\u003c\/p\u003e    \u003cp\u003eThis model was built in the early 1960s to a high standard by an talented  engineer whose next engine, a 2 inch scale Fowler Showman's engine went on to  take a silver medal at the Model Engineer Exhibition. It has only ever been run  on air.\u003c\/p\u003e    \u003cp\u003eCopper boiler, feed by mechanical pump on the second shaft and injector.  Three cock water gauge with blowdown, 0-120 psi pressure gauge. Two speed with  differential and back axle-mounted winch. Mechanical lubricator for cylinder  with drain cocks operated from footplate. Dummy displacement lubricator on  cylinder block and governor.\u003c\/p\u003e    \u003cp\u003eThe engine runs very well on air, with crisp exhaust beats and a good  tickover in both directions.We have tested the boiler at 180 psi, twice the 90  psi working pressure. The boiler is structurally sound, with no leaks from  tubes, tubeplate or firebox. There are two leaks at the top of the backhead  flanged joint to the wrapper, which appear to be due to inadequate solder  penetration. Some earlier attempt has been made to caulk with solder, but really  the back of the engine requires dismantling to gain adequate access to seal them  up - this work will need to be done before the engine is steamed.\u003c\/p\u003e    \u003cp\u003eLength 26 inches\u003cbr\u003e  Height 17 inches\u003cbr\u003e  Weight approx 80 pounds\u003c\/p\u003e","brand":"Station Road Steam","offers":[{"title":"Default Title","offer_id":54009528582485,"sku":"1882","price":2250.0,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1023\/0094\/2677\/files\/1882-1.webp?v=1779898114","url":"https:\/\/stationroadsteam.com\/products\/1-12-inch-scale-allchin-traction-engine-stock-code-1882","provider":"Station Road Steam","version":"1.0","type":"link"}