The Hispano-Suiza 12X was an aircraft piston engine designed in France by Hispano-Suiza during the early 1930s. A 12-cylinder Vee, liquid-cooled design, the 12X was used on several aircraft types, some of them being used in limited numbers during World War II. Due to the 12X's limited power output, its derivative the more powerful Hispano-Suiza 12Y had a longer career.
Type 72 Hispano-Suiza 12X engines. V-12, bore=130 mm, stroke=170 mm, capacity=27.0 litres.
Model
Year
Compression
Power (hp)
@ r.p.m.
T-O power (hp)
Output reduction
Supercharger optimum altitude (m)
Weight (kg)
Comments
12Xbr (500 hp)
1932
6.4
610
2,200
610
1.5
0
355
Unsupercharged. Rated power (500 hp) less than nominal 610 hp
12Xbrs (500 hp)
1932
5.8
650
2,650
600
1.5
4,000
370
Rated power (500 hp) less than nominal 650 hp
12Xbrg (500 hp)
1932
5.8
715
2,650
670
1.5
2,000
370
Rated power (500 hp) less than nominal 650 hp
12Xbr (600 hp)
1934
6.4
600
2,200
630
1.5
355
For this and all later entries in both tables, Rated power = Nominal power = Power
12Xbrs (690 hp)
1934
5.8
690
2,600
660
1.5
4,500
370
12Xbrs1 (720 hp)
1934
5.8
720
2,600
704
1.5
2,750
370
12Xdrs
1935
5.8
690
2,600
670
1.5
4,000
370
Left handed
12Xfrs
1935
5.8
690
2,600
670
1.5
4,000
370
Right handed
12Xgrs
1935
5.8
690
2,600
670
1.5
4,000
370
Hamilton propeller, right handed
12Xgrs1
1937
5.8
720
2,600
1.5
2,100
370
Hamilton propeller, right handed
12Xhrs
1935
5.8
690
2,600
670
1.5
4,000
370
Hamilton propeller, left handed
12Xhrs1
1937
5.8
720
2,600
1.5
2,100
370
Hamilton propeller, left handed
12Xirs
1935
5.8
690
2,600
670
1.5
4,000
370
Flat flange propeller, left handed
12Xjrs
1935
5.8
690
2,600
670
1.5
4,000
370
Flat flange propeller, right handed
Type 76 Hispano-Suiza 12X engines with 20 mm calibre Hispano-Suiza 404 cannon between cylinder banks, firing through propeller shaft. Cylinder dimensions as Type 73.
