The Dornier Do 15 was a RLM designation of the Dornier Militär-Wal twin engines flying boat
Type 4-seat reconnaissance flying boat
Engine 2  BMW VI7,3
Dimensions Length 18,17 m , height  m ,  span 22,5 m , wing area 96 m2  ,
Weights Empty 5060 kg, loaded 8000 kg , max. take off weight  
Performance Max.. speed  209 km/h, cruising speed  , range 2000 km, endurance  , service ceiling   , climb
Armament 1  7.92 mm MG 15 machine gun in bow position ,1 × 7.92 mm MG 15 machine gun in dorsal position . Bomb load up to 4 × 50 kg on external wing racks
Variants:
Do 15 J
Do 15R
Do 15 R-2
Do 15 R-4