Alvaston built water-cooled, horizontally opposed cylinder engines, between 1910 and 1914.

-The cylinders were fastened with long studs from the cylinder head to the block. At the crankshaft was a freewheel working as a "damper" to give a smooth run at low revs.

-It had single ignition.

-The smallest one gave 20 hp at 1,200 rpm with two cylinders. The 30 hp engine had the same number of cylinders . The 50 hp had four cylinders.

-The displacement of the three were respectively 141, 212 and 317 cu. in.

-An Alvaston hp 25 was used in the Handley Page, type A aircraft.

-We received information about the Alvaston horizontally-opposed, four-cylinder engine from 1911.

-First we offer a diagram of the 50 hp engine.

"Schematic front diagram"

"Rear view of the 50 hp Alvaston"

“More detailed view”

-The water casings, probably copper are screwed to the cylinder body, as we can see.

-Appendix 7: We received a new picture of the horizontal-opposed, two-cylinder Alvaston, which was water-cooled and gave 35 hp.

“Alvaston in the Yates of Sussex” (PiP)

-From appendix 9: Remains of an Alvaston engine located in a British museum, displayed in a glass case. The engine is not complete.

“Glass case with remains of an Alvaston two-cylinder engine”

-In the case there are some clamps composed of four long studs that join, or should we say pack, the center block and the two cylinders, from end to end.