DC-6 The original aircraft, powered by a 170 hp (130 kW) Curtiss Challenger, developed as a scaled-down Cessna CW-6. Model DC-6A Chief Fitted with a 300 hp (220 kW) Wright R-975 (J-6-9) Whirlwind engine; 20 built. Model DC-6B Scout Fitted with a 225 hp (168 kW) Wright J-6-7 (R-760) engine; 24 built.