in Blue Mist, 1918 In 1906, Rolls-Royce produced four chassis to be shown at the Olympia car show, two existing models, a
four-cylinder 20 hp and a
six-cylinder 30 hp, and two examples of a new car designated the 40/50 hp. The 40/50 hp was so new that the show cars were not fully finished, and examples were not provided to the press for testing until March 1907. The car at first had a new
side-valve, six-cylinder, 7036 cc engine (7428 cc from 1910) with the cylinders cast in two units of three cylinders each as opposed to the triple two-cylinder units on the earlier six. A three-speed transmission was fitted at first with four-speed units used from 1913. The seven-bearing
crankshaft had full pressure lubrication, and the centre main bearing was made especially large to remove vibration, essentially splitting the engine into two three-cylinder units. Two spark plugs were fitted to each cylinder with, from 1921, a choice of
magneto or
coil ignition. along with electric lights to replace the older ones that used
acetylene or oil. Development of the Silver Ghost was suspended during
World War I, although the chassis and engine were supplied for use in
Rolls-Royce Armoured Cars. A blue 1909 Silver Ghost known as Blue Mist, previously owned by an Irish lord, was used by
Lawrence of Arabia as his personal staff car during the
Arab Revolt. Construction of a replica Blue Mist began in 2018. The chassis had rigid front and rear axles and
leaf springs all round. Early cars only had brakes on the rear wheels operated by a hand lever, with a pedal-operated transmission brake acting on the
propeller shaft. The footbrake system moved to drums on the rear axle in 1913. Four-wheel servo-assisted brakes became optional in 1923. After this, older 40/50 models were called Silver Ghosts to avoid confusion. A total of 7874 Silver Ghost cars were produced from 1907 to 1926, including 1701 from the American Springfield factory. The documented chassis price listed for the 1921 American version was US$11,750 ($ in dollars ). Many of them still run today. A fine example is on display at the
National Motor Museum, Beaulieu. ==The Alpine Eagles==