A simple uniflow engine based on a design by Stan Bray.
The mechanical design follows SB's original plans scaled up to x3.5, but much of the layout and appearance of my version are my own.
Dimensions (excluding wooden plinth) -Overall length: 450 mm / 17 5/8 inches
Frame width: 145 mm / 5 ¾ inches
Overall width (including crankshaft): 300 mm / 11 ¾ inches
Height: 203 mm / 8 inches
Bore: 35.7 mm / 1 7/16 inches
Stroke: 40 mm / 1 5/8 inches
Flywheel diameter: 157 mm / 6 3/16 inches
Large pulley (round belt) diameter: 112 mm / 4 7/16 inches
Small pulley (flat belt) diameter: 51 mm / 2 inches
Weight: 12.9 kg / 28.4 lbs
Materials -Frame (including base): aluminium
Cylinder: cast iron
Piston: cast iron
Crosshead: cast iron
Connecting rod: bronze
Big end: cast iron
Crankshaft: steel
Main bearings: bronze
Flywheel: steel
Large pulley: brass
Small pulley: aluminium
Bushes and collars: bronze and cast iron
Fixings: stainless steel
The plinth is made from solid oak with commercially-bought steel and rubber feet.
gary