PROTOTYPE
British Railways Class 7 4-6-2 BRITANNIA
built in 1951 |
| SCALE |
3/4" = 1' (l/16 full size) |
| GAUGE OF TRUCK |
3-1/2" (89 mm) |
| DRIVING WHEELSD |
117 mm (O4-5/8") |
| CYLINDERS |
Bore : 30 mm (1-3/16")
Stroke : 46 mm (1-13/16")
Drain : 4 cocks (hand) |
| PISTON VALVES |
Bore 18 mm (23/32")
Travel 12.6 mm. (l/2")
Cut-off 80 - 85%
Steam Lap 2.25mm (3/32")
Exhaust Lap 0.7 mm (1/32")
Port Opening 4 mm (5/32") |
| VALVE GEARS |
Walshaerts |
BOILER
Belpaire type with combustion chamber
Material : all copper silver soldered Twin safety valves.
Working Pressure : 5.6kg/cm2 (80Lbs/in2)
Hydraulic Test Pressure : 13kg/cm2 (180 Lbs/in2)
Water Capacity : 3,000 cc (106 oz.)
Grate Area : 120 x 115 mm (4-3/4" x 4-1/2")
Fuel : Coal or L.P.G.
Regulator : Screw type |
| WATER FEEDING |
Axle Driven Pumps (2) O 8 x 12 mm (O5/16" x 1/2")
Hand Pump : 12 x 20 mm (O15/32" x 3/4")
Injector : Output 400 cc/min. (14 oz./min.)
Donkey Pump :O8 x 12.6 mm (O5/16" x l/2") |
| LUBRICATOR |
Mechanical Single Ram O3.3 x 6.6 mm (O1/8" x 1/4")
Ratchet Wheel : 34T
Oil Tank Capacity : 26 cc (0.8 oz.) |
| WHISTLE |
Steam O16 x 100 mm (O5/8" x L4") |
| BRAKES |
Steam Hand included |
| WElGHT |
Engine : 41 kg (90.4 Lbs) Working order
Tender : 8.5 Kg (18.7 Lbs)
Equipped with hand water pump
Tender Water Tank Capacity : 3,500 cc (120 oz.) |
| BEARINGS |
Main Axles : Needle'bearings
Connecting Rod : Needle bearings
Other parts : 12 Needle bearings & 4 Ball bearings |
| SIZE |
Length : 1,330 mm (52-1/2")
Width : 190 mm (7-1/2")
Height : 270 mm (10-5/8") |
