Data from Gustav Reder (Michael Reynolds, trans), The world of steam locomotives (New York: Putnam, 1974).
Based on Stephenson's Planet, this design added the trailing axle that allowed for a larger firebox and improved the ride. Reder argues that the improved ride was "only a happy coincidence." Rather the 1833 patent shows that Stephenson's main intent was to "sustain the weight of a larger boiler than herebefore (sic) used." In addition to the 2-2-2 arrangement, the patent also covered the valve gear, and the frame, which was of the sandwich type with thick wooden members flanked by wrought iron. Stephenson also eliminated the flange from the driver to prevent it from shouldering against the rail in curves.
Whatever the reason for adoption of the 2-2-2, the Patentee was the first of thousands of the type. The Sharp type had welded axle horns and a gently bowed frame to eliminate axle horn breakage.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | Patentee |
| Locobase ID | 3029 |
| Railroad | Liverpool & Manchester |
| Country | Great Britain |
| Whyte | 2-2-2 |
| Number in Class | |
| Road Numbers | |
| Gauge | Std |
| Number Built | |
| Builder | Robert Stephenson & Co |
| Year | 1833 |
| Valve Gear | |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | |
| Engine Wheelbase (ft / m) | 10 / 3.05 |
| Ratio of driving wheelbase to overall engine wheelbase | |
| Overall Wheelbase (engine & tender) (ft / m) | |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | 9637 / 4371 |
| Weight on Drivers (lbs / kg) | 9637 / 4371 |
| Engine Weight (lbs / kg) | 25,760 / 11,685 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | |
| Tender Water Capacity (gals / ML) | |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 16 / 8 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 60 / 1524 |
| Boiler Pressure (psi / kPa) | 50 / 340 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 11" x 18" / 279x457 |
| Tractive Effort (lbs / kg) | 1543 / 699.89 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 6.25 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 106 - 1.625" / 41 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 7.09 / 2.16 |
| Firebox Area (sq ft / m2) | 52.20 / 4.85 |
| Grate Area (sq ft / m2) | 9.90 / 0.92 |
| Evaporative Heating Surface (sq ft / m2) | 364 / 33.83 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 364 / 33.83 |
| Evaporative Heating Surface/Cylinder Volume | 183.85 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 495 |
| Same as above plus superheater percentage | 495 |
| Same as above but substitute firebox area for grate area | 2610 |
| Power L1 | 1578 |
| Power MT | 360.99 |