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South African class HF
The class HF was a 2-8-2+2-8-2 Modified Fairlie that did not only have two driving axles more than the preceding classes FC and FD, but also a higher axle loading . The class designation should have been “FE”, but obv...
General
| Property | South African class HFRemove |
|---|---|
| Built | 1926-1927 |
| Manufacturers | Henschel |
| Wheel arrangement | 2-8-2+2-8-2T (Modified Fairlie) |
| Gauge | 1,067 mm (Cape gauge) |
Dimensions and weights
| Property | South African class HFRemove |
|---|---|
| Length | 12.64 m |
| Wheelbase | 21.29 m |
| Rigid wheelbase | 3.89 m |
| Service weight | 152.5 t |
| Adhesive weight | 104.5 t |
| Axle load | 13.3 t |
| Water capacity | 20,911 l |
| Fuel capacity | 9.1 t (coal) |
Boiler
| Property | South African class HFRemove |
|---|---|
| Grate area | 4.924 m² |
| Firebox surface | 19.417 m² |
| Tube heating surface | 191.566 m² |
| Evaporative heating surface | 210.983 m² |
| Superheater surface | 55.556 m² |
| Total heating surface | 266.5 m² |
Power plant
| Property | South African class HFRemove |
|---|---|
| Driver diameter | 1,168 mm |
| Boiler pressure | 12.4 bar |
| Expansion type | simple expansion |
| Cylinders | four, 457 x 610 mm |
Power
| Property | South African class HFRemove |
|---|---|
| Power source | steam |
| Estimated power | 1,193 kW (1,622 PS) |
| Starting effort | 230.1 kN |
Calculated values
| Property | South African class HFRemove |
|---|---|
| Factor of adhesion | 1 : 4.45 |
| Optimal speed | 32 km/h |
| Power-to-weight ratio | 7.8 kW/t |
| Heating Surface Equivalent | 419.2 m² |
| Cylinder volume/HSE | 1 : 955.01 |
| Adhesive weight/Total | 1 : 1.46 |
| Tractive force/Heating surface | 1 : 18.03 |
| Grate area/Heating surface | 1 : 54.13 |
| Firebox/Tube surface | 1 : 9.87 |
| Total/Superheater | 1 : 3.80 |
