{"product_id":"3-inch-scale-david-brown-tractor-stock-code-4385","title":"3 inch scale David Brown tractor","description":"\u003cp align=\"left\"\u003eThis is one of those models that comes along which you simply  look at and admire the builder's vision and ability.\u003c\/p\u003e  \u003cp align=\"left\"\u003eThe man responsible for this 3 inch scale David Brown tractor  was a life long model engineer - the first mention I can find of him being a  cover picture on the \"Model Engineer\" for 1st September 1948, showing  his model of a Bedford \"Mechanical Horse\", featuring a 40cc four  cylinder side valve engine capable of pulling its driver along at 12mph.\u003c\/p\u003e  \u003cp align=\"left\"\u003eIn a modelling careeer lasting seventy years, he produced a  large range of models, from a fifteen foot high hot air balloon to a lightweight  aero engine made from the magnesium case of an unexploded fire bomb recovered in  the war. By the 1970s he was working on a complicated 90 day going long case  clock which occupied him for ten years, then back to internal combustion engines  which appear to have been a recurring theme in his models.\u003c\/p\u003e  \u003cp align=\"left\"\u003eThis, then, is a model of a David Brown 990 tractor, featuring a  four cylinder water-cooled engine of the builder's own design with three-bearing  crankshaft, overhead camshaft and electronic ignition. Lubrication is by pump to  all moving parts rather than splash. Distributor features manual advance and  retard, rod-operated from the dashboard. The entire engine is fabricated bar the  pistons, which were made from castings, each fitted with two compression and an  oil scraper ring. Sparks plugs are of the builder's own construction.\u003c\/p\u003e  \u003cp align=\"left\"\u003eClutch is a single-plate unit operated from a trigger atop the  gear lever, gearbox is three speed and reverse coupled to a secondary 4:1  reduction gearbox which drives the rear wheels via a differential.\u003c\/p\u003e  \u003cp align=\"left\"\u003eThe power takeoff pulley is coupled to the gearbox, disengaged  by a foot pedal just behind it. There is a working oil pump for the hydraulic  system, coupled to the rear-mounted lifting gear with operating lever just in  front of the seat.\u003c\/p\u003e  \u003cp align=\"left\"\u003eLights are powered from a working alternator, belt driven from  the crankshaft pulley. Engine is fitted with an electric starter, with solenoid  engagement.\u003c\/p\u003e  \u003cp align=\"left\"\u003eNot satisfied with having produced something of this complexity,  the builder then extended his ingenuity to fit three channel radio control in  tandem with the controls already fitted, allowing either manual or radio control  of the throttle, clutch and steering.\u003c\/p\u003e  \u003cp align=\"left\"\u003eThe builder documents the project as having taken just under two  years to complete, including a two month development phase for the engine  itself.\u003c\/p\u003e  \u003cp align=\"left\"\u003eLength 36 inches\u003cbr\u003e  Height 25 inches\u003cbr\u003e  Width 21 inches\u003c\/p\u003e  \u003cp align=\"left\"\u003eWeight approx 120 pounds\u003c\/p\u003e  \u003cp align=\"center\"\u003e\u003c\/p\u003e","brand":"Station Road Steam","offers":[{"title":"Default Title","offer_id":54020075389269,"sku":"4385","price":2950.0,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1023\/0094\/2677\/files\/4385-1.webp?v=1779910514","url":"https:\/\/stationroadsteam.com\/products\/3-inch-scale-david-brown-tractor-stock-code-4385","provider":"Station Road Steam","version":"1.0","type":"link"}