OUR MODEL  
Our model represents the 42xx, 52xx and 72xx classes covering the majority of the class. The model is designed with working outside cylinders which with the small wheels will give a high tractive effort. Inside slide valves are driven by a simple, robust, and easy to set, slip eccentric gear. A hand pump is located in one of the water carrying side tanks which also feeds water to an axle driven pump. The bunker will carry the meths tank.

Scale            : 10mm : 1ft

Length         : 42xx/ 52xx  408mm over buffers
                    : 72xx            448mm over buffers

Radius  min  : 42xx / 52xx   2.5m   (8’3”)
                      :72xx              2.61m  (8’8”)

Weight         : 5 Kg   estimated.

Fuel               : Alchohol  (Methylated spirit) supplied by constant level feed system.
                     :  to a multi-tube ‘strand wick’ burner.

Boilers           : Internally fired, multi flue, superheated. with safety  valve.
                      : Built from copper and bronze, silver soldered throughout.
                      : Tested to 200psi  (13bar)
                      :   Max.allowable working pressure 100psi (6.86 bar)

Controls         : Regulator, blower,  pressure gauge and possible water gauge.
                      : Spirit valve in rear bunker
                      : Bypass valve on side tank for water pumps.

Cylinders      : Two,  Outside 14.3 mm dia x 25mm stroke  (9/16” x 63/64”)

Valvegear     : Slip eccentric, slide valve, between frames.

Lubrication  :  Displacement (Rosco) type with filler and drain.

Water feeds : Water carried in both side tanks
                      : Hand pump with bypass valve in side tank.
                     : Axle driven pump with its pipework, clack valve and boiler feed.

General         :  Loco suspension, buffers and coupling hooks sprung.
                    :  Wheels and axles are to Gauge One ‘Standard’ dimensions.