Originally designed by Webb as a four cylinder compound, in which form the locomotives proved unreliable, they were all rebuilt by Whale as two cylinder engines.
The model takes this a step further, with a single cylinder driving a heavy flywheel, gear driven to the wheels and fitted with slip eccentric valve gear. It runs beautifully on air, the wheels ticking over smoothly at a walking pace courtesy of the reduction drive.
The boiler is spirit-fired, fitted with a six wick burner.
gauge | 2 1/2 inch |
length/inches | 17 1/2 +12 |
width/inches | 4 1/2 |
height/inches | 7 1/2 |
weight/kg | 9 |
wheel material | cast iron |
axlebox type | plain bearing |
cylinder material | gunmetal |
valve type | slide |
valve gear | slip eccentric |
boiler type | water tube |
boiler material | copper |
safety valve(s) | 1 |
safety valve type | spring |
hand pump | 1 |