The Hall-Scott A-7 was an early liquid-cooled aircraft engine manufactured by the Hall-Scott company of Berkeley, California.

Using a straight-4 configuration, the engine developed 90 horsepower (67 kW) as the A-7 and 100 horsepower (75 kW) as the A-7a.

In service these engines suffered from reliability problems and were prone to catch fire while in operation.

In 2017 about seven A-7a engines were still in use in Edwardian racing cars, mostly in the United Kingdom.

Data from Airplane Engine Encyclopedia [1] Related lists