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.
Tabulated data from: Lage, 2004[1]
| 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 |
| Model | Year | Compression | Power (hp) | @ r.p.m. | T-O power (hp) | Output reduction | Supercharger optimum altitude (m) | Weight (kg) | Comments | |
|---|---|---|---|---|---|---|---|---|---|---|
| 12Xcrs (690 hp) | 1934 | 5.8 | 690 | 2,600 | 660 | 1.5 | 4,500 | 380 | ||
| 12Xers | 1934 | 5.8 | 690 | 2,600 | 660 | 1.5 | 4,500 | 380 | Variable-pitch propeller | |
| 12Xirs | 1937 | 5.8 | 690 | 2,600 | 660 | 1.5 | 3,900 | 385 | Left handed | |
| 12Xjrs | 1937 | 5.8 | 690 | 2,600 | 660 | 1.5 | 3,900 | 385 | Right handed | |
| 12Xirs1 | 1937 | 5.8 | 720 | 2,600 | 738 | 1.5 | 2,100 | 385 | Left handed | |
| 12Xjrs1 | 1937 | 5.8 | 720 | 2,600 | 738 | 1.5 | 2,100 | 385 | Right handed | |
| 12X 13 | 1937 | 690 | 2,600 | 738 | 1.5 | 3,900 | 371 |