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Bavarian AA I
The AA I was a prototype used to test ways of saving coal and water by using a lift axle. It was based on the B XI, which was built from 1892 both as a conventional saturated simple locomotive and with a compound engi...
General
| Property | Bavarian AA I as built |
|---|---|
| Built | 1896 |
| Manufacturers | Krauss |
| Wheel arrangement | 4-2-2-2 |
| Gauge | 1,435 mm (Standard gauge) |
Dimensions and weights
| Property | Bavarian AA I as built |
|---|---|
| Length | 16.57 m |
| Wheelbase | 7.40 m |
| Rigid wheelbase | 2.55 m |
| Service weight | 51.7 t |
| Adhesive weight | 28 t |
| Axle load | 14.9 t |
| Water capacity | 14,500 l |
| Fuel capacity | 6 t (coal) |
Boiler
| Property | Bavarian AA I as built |
|---|---|
| Grate area | 2.26 m² |
| Firebox surface | 9.5 m² |
| Tube heating surface | 116.78 m² |
| Evaporative heating surface | 126.28 m² |
| Total heating surface | 126.3 m² |
Power plant
| Property | Bavarian AA I as built |
|---|---|
| Driver diameter | 1,870 mm |
| Boiler pressure | 13 bar |
| Expansion type | compound |
| Cylinders | two, HP: 385 x 610 mm and LP: 610 x 610 mm |
Power
| Property | Bavarian AA I as built |
|---|---|
| Power source | steam |
| Estimated power | 500 kW (680 PS) |
| Top speed | 90 km/h |
| Starting effort | 38.2 kN |
| Starting effort simple | 45.9 kN |
| Starting effort booster | 35.965 kN |
Calculated values
| Property | Bavarian AA I as built |
|---|---|
| Factor of adhesion | 1 : 7.19 |
| Optimal speed | 80 km/h |
| Power-to-weight ratio | 9.7 kW/t |
| Heating Surface Equivalent | 173.8 m² |
| Cylinder volume/HSE | 1 : 921.56 |
| Adhesive weight/Total | 1 : 1.85 |
| Tractive force/Heating surface | 1 : 6.32 |
| Grate area/Heating surface | 1 : 55.88 |
| Firebox/Tube surface | 1 : 12.29 |
