Type a, b 4-seat bomber C 4-seat bomber
Engine 2 Siemens Jupiter VI 2 BMW  VI 7,3Z
Dimensions Length  18,75 m  m, height 6,32 m ,  span 28 m , wing area 112 m2  ,
Weights Empty 5530 kg, loaded  8000 kg, max. take off weight   Empty 6050 kg, loaded 8600 kg , max. take off weight  
Performance Max.. speed 245 km/h at 1000 m , cruising speed 200 km/h , landing speed 85 km/h,  range 1300 km, endurance  , service ceiling 3600 m  , climb to 3000 m 27 min. 24 sec. Max.. speed 260 km/h , cruising speed 225 km/h ,  landing speed 85 km/h, range 1200 km, endurance  , service ceiling 4600 m  , climb to 2000 m 18 min.
Armament 3  manually aimed 7.92 mm  MG 15 machine guns, 1 in each of open nose (750 rounds), dorsal ( 750 rounds) and ventral  ( 525 rounds) positions , up to 1000 kg  of bombs
The Dornier Do 13 was a short-lived 1930s German bomber design.[1] It was the designation given to the aircraft resulting from attempts to improve on the Do 11. However, only a few were built, because the design changes caused serious problems, with many of the first flights ending in crashes. Another redesign ensued, resulting in the Do 23 and Do 13s under construction were converted to the Do 23 design.

Variants
Do 13c : Initial production version.
Do 13d : Improved version.