m) to 42 ft 3 in (12.88 m). The fin and rudder were enlarged and the fuselage was also lengthened. The upper wing was raised on the "B" model by 8 in (20 cm) to reduce aerodynamic interference between the wings and improve cockpit visibility. Super Ag Cat B/525 The B/525 incorporated the design improvements of the B/450, but was powered by a Continental /Page R-975 engine. Super Ag Cat C/600 The C/600 first flew in 1976. It is similar to the model B/450, but has its fuselage further stretched to incorporate a agricultural hopper. The model is powered by a 600 hp (450 kW) Pratt & Whitney R-1340 radial engine. Turbo Ag Cat D/T The "D" model is similar to the C/600, but replaced the radial piston engine with a Pratt & Whitney PT6A turboprop powerplant of 680 shp (507 kW). Turbo Ag Cat D/ST The D/ST model is identical to the Turbo Ag Cat D/T, but the engine was a Pratt & Whitney PT6A turboprop powerplant of 750 shp (559 kW). Turbo Ag Cat D/SST The D/SST model is identical to the Turbo Ag Cat D/T, but is powered by a Pratt & Whitney PT6A turboprop powerplant of 850 shp (634 kW). Ag Cat B-Plus/600 Introduced in 1982 the B-Plus/600 is powered by a Pratt & Whitney R-1340 of 600 hp (450 kW). It has the larger hopper of the "C" model. Ag Cat B-Plus/450 Also made available for the first time in 1982, the lower-powered B-Plus/450 is powered by a Pratt & Whitney R-985 of 450 hp (335 kW). This model was available only as a custom order. Marsh G-164 C-T Turbo Cat This aftermarket conversion was created by replacing the engine of the Super Ag Cat C/600 with a Garrett TPE331-1-101 turboprop, derated to 600 hp (450 kW). Mid-Continent King Cat This aftermarket conversion of the Super Ag Cat C/600 replaced the 600 hp (450 kW) Pratt & Whitney R-1340 engine with a Wright R-1820-202A radial engine that produces 1,200 hp (895 kW). Twin Cat An aftermarket conversion by Twin Cat Corporation,it relaces the R-1340 with two Avco Lycoming TIO-540-J flat-six engines, close mounted to the sides of the forward fuselage. The prototype conversion flew in 1979, with conversion kits on sale from 1980. Ethiopian Airlines Eshet License-built Ag Cat Super B Turbine with local content from 1986. Aircraft on display National Air and Space Museum,