Model Variants (Including Prototypes)
Do 18A - Prototype Designation
Do 18E - Fitted with Junkers Jumo 205C engines of 600 horsepower each; four produced.
Do 18F - Later redesignated to Do 18L name.
Do 18L - Redesignation of Do 18F when refitted with BMW 132N engines of 880 horsepower each.
Do 18D-1 - Initial Militarized Version; 2 x Junkers Jumo 205C engines; implementation of 7.92mm MG15 machine guns in bow and dorsal positions.
Do 18D-2 - Do 18D subvariant
Do 18D-3 - Do 18D subvariant
Do 18G-1 - "Improved" Do 18; fitted with Junkers Juno 205D engines of 880 horsepower each; 1 x MG131 13mm machine gun in bow position; 1 x MG151 20mm cannon in power-operated turret.
Do 18H - Trainer with dual-controls sans armament.
Do 18N-1 - Dedicated Air & Sea Rescue Variant; sans armament.