Specifications (Do 28B-1) Data from Jane's All The World's Aircraft 1965-66 General characteristics     Crew: 1     Capacity: 7 passengers     Length: 9.00 m (29 ft 6 in)     Wingspan: 13.80 m (45 ft 3½ in)     Height: 2.80 m (9 ft 2 in)     Wing area: 22.7 m² (241 sq ft)     Airfoil: NACA 23018 (modified)     Aspect ratio: 8.5     Empty weight: 1,730 kg (3,806 lb)     Max takeoff weight: 2,720 kg (5,984 kg)     Powerplant: 2 × Lycoming IO-540A air-cooled flat-six, 216 kW (290 hp) each     Propellers: Harzell three-bladed propeller, 1 per engine         Propeller diameter: 2.03 m (6 ft 8 in) Performance     Never exceed speed: 334 km/h (180 knots, 207 mph)     Maximum speed: 290 km/h (160 knots, 184 mph) at sea level     Cruise speed: 242 km/h (130 knots, 150 mph) at sea level (econ. cruise)     Stall speed: 70 km/h (38 knots , 44 mph)     Range: 1,235 km (668 nmi, 768 mi) (max payload)     Ferry range: 1,680 km (957 nmi, 1,100 mi) (auxiliary fuel)     Service ceiling: 6,300 m (20,700 ft)     Rate of climb: 7.1 m/s (1,400 ft/min)