https://en.wikipedia.org/wiki/Heinkel_HE_12

General characteristics

• Crew: Two, pilot and radio operator
• Capacity: 200 kg (440 lb) of mail
• Length: 11.56 m (37 ft 11 in) 
  

He 58: 11.7793 m (38 ft 7.75 in)

• Wingspan: 16.7958 m (55 ft 1.25 in) 
  

He 58: 17.2022 m (56 ft 5.25 in)

• Height: 4.60 m (15 ft 1 in) 
  

He 58: 4.70 m (15 ft 5 in)

• Wing area: 48.5 m² (522 sq ft) 
  

He 58: 49.4 m² (532 sq ft)

• Empty weight: 1,580 kg (3,483 lb) 
  

He 58: 1,850 kg (4,078 lb)

• Gross weight: 2,600 kg (5,732 lb) 
  

He 58: 3,140 kg (6,922 lb)

• Powerplant: 1 × Pratt & Whitney Hornet 9-cyl. air-cooled radial piston engine, 370 kW (500 hp)

Performance

• Maximum speed: 134 km/h (83 mph; 72 kn) 
  

He 58: 204 km/h (127 mph)

• Cruise speed: 192 km/h; 103 kn (119 mph) 
  

He 58: 159 km/h (99 mph)

• Service ceiling: 3,800 m (12,500 ft)