Stanley Motor Carriage Company - Specifications and Design

Specifications and Design

Early Stanley cars had light wooden bodies mounted on tubular steel frames by means of full-elliptic springs. Steam was generated in a vertical fire-tube boiler, mounted beneath the seat, with a vaporizing gasoline (later, kerosene) burner underneath. The boiler was reinforced by several layers of piano wire wound around it, which gave it a strong, yet relatively light-weight, shell. In early models, the vertical fire-tubes were made of copper, and were expanded into holes in the upper and lower crown sheets. In later models, the installation of a condenser caused oil-fouling of the expansion joints, and welded steel fire-tubes were used instead. The boilers were safer than one might expect – they were fitted with safety valves, and even if these failed, a dangerous overpressure would rupture one of the many joints long before the boiler shell was in danger of bursting, and the resulting leak would relieve the boiler pressure and douse the burner with little risk to the occupants of the car. There has never been a documented case of a Stanley boiler exploding in use.

The engine had two double-acting cylinders side-by-side, equipped with slide-valves, and was of the simple-expansion type. Drive was transmitted directly from the engine crankshaft to a rear-mounted differential by means of a chain. Locomobiles were often modified by their owners, who added third-party accessories, e.g., improved lubricators, condensers, and devices which mitigated the laborious starting procedure, and so forth.

Later, the Stanley brothers, to overcome patent difficulties with the design they had sold to Locomobile, developed a new automobile model with twin cylinder engines geared directly to the back axle. Later models had aluminium coachwork that resembled internal combustion cars of the time but retained the many steam car features for example no transmission, clutch, or driveshaft. They also had a fully sprung tubular steel frame.

When they later shifted the steam boiler to the front of the vehicle, the resulting feature was called by owners the "coffin nose." In order to improve range, condensers were used, beginning in 1915. A Stanley Steamer set the world record for the fastest mile in an automobile (28.2 seconds) in 1906. This record was not broken by any automobile until 1911, although Glen Curtiss beat the record in 1907 with a V-8 powered motorcycle at 136 mph (219 km/h). The record for steam-powered automobiles was not broken until 2009.

Production rose to 500 cars in 1917.

The Stanley Steamer was sometimes nicknamed "The Flying Teapot". At least one Stanley Steamer found its way to Castle Hill, New South Wales, Australia where it was driven in the late 1920s.