The first used a modified BMW 801D to create the BMW 801J, 801J engine photo at Flightglobal (accessed March 11, 2016) delivering 1,810 PS (1,785 hp, 1,331 kW) at takeoff and 1,500 hp (1,103 kW) at 12200 meters , an altitude where the D was struggling to produce 630 hp (463 kW).