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Great Central class 11F “Improved Directors Class”
The class 11F of the Great Central was developed by Robinson as the successor to the class 11E, called “Directors Class”. This is why they were also called “Improved Directors Class”. Although they had similar dimensi...
General
| Property | Great Central class 11F “Improved Directors Class”Remove |
|---|---|
| Built | 1919-1924 |
| Manufacturers | GCR, Kitson & Co., Armstrong Whitworth |
| Wheel arrangement | 4-4-0 (American) |
| Gauge | 1,435 mm (Standard gauge) |
Dimensions and weights
| Property | Great Central class 11F “Improved Directors Class”Remove |
|---|---|
| Wheelbase | 7.70 m |
| Rigid wheelbase | 3.05 m |
| Service weight | 62.1 t |
| Adhesive weight | 40.4 t |
| Axle load | 19.8 t |
| Total weight | 111.2 t |
| Water capacity | 18,185 l |
| Fuel capacity | 6.1 t (coal) |
Boiler
| Property | Great Central class 11F “Improved Directors Class”Remove |
|---|---|
| Grate area | 2.471 m² |
| Firebox surface | 14.4 m² |
| Tube heating surface | 128.95 m² |
| Evaporative heating surface | 143.35 m² |
| Superheater surface | 19.417 m² |
| Total heating surface | 162.8 m² |
Power plant
| Property | Great Central class 11F “Improved Directors Class”Remove |
|---|---|
| Driver diameter | 2,057 mm |
| Boiler pressure | 12.4 bar |
| Expansion type | simple expansion |
| Cylinders | two, 508 x 660 mm |
Power
| Property | Great Central class 11F “Improved Directors Class”Remove |
|---|---|
| Power source | steam |
| Estimated power | 858 kW (1,167 PS) |
| Starting effort | 87.4 kN |
Calculated values
| Property | Great Central class 11F “Improved Directors Class”Remove |
|---|---|
| Factor of adhesion | 1 : 4.54 |
| Optimal speed | 60 km/h |
| Power-to-weight ratio | 13.8 kW/t |
| Heating Surface Equivalent | 254.2 m² |
| Cylinder volume/HSE | 1 : 1,053.19 |
| Adhesive weight/Total | 1 : 1.54 |
| Tractive force/Heating surface | 1 : 11.21 |
| Grate area/Heating surface | 1 : 65.87 |
| Firebox/Tube surface | 1 : 8.95 |
| Total/Superheater | 1 : 7.38 |
