R-4360-4 - 2,650 hp (1,976 kW) R-4360-20 - 3,500 hp (2,610 kW) R-4360-25 - 3,000 hp (2,237 kW) R-4360-41 - 3,500 hp (2,610 kW) R-4360-51 VDT - "Variable Discharge Turbine" 4,300 hp (3,210 kW). Intended for B-36C. Used on Boeing YB-50C Superfortress.