Salmson 18 Cmb
water cooled (!) double radial
Power 520 HP @ 1650 rpm
Bore×Stroke: 125×170
Displacement: 37,5 litres
Compression ratio: 5,4
Weight: 470 kg
From "Les moteurs a pistons aeronautiques francais (1900-1960)" by Alfred Bodemer and Robert Laugier