The RWD 18 was a four/five seat STOL (Short Take-Off and Landing) utility aircraft designed and built in Poland from 1936.
The fuselage was a welded steel tube framework faired with wooden formers, covered with plywood and fabric, fitted out with a dual control cockpit and a bench seat in the cabin for two or three.
At the rear of the fuselage a cantilever twin finned wooden tail unit was fitted to improve low-speed yaw control and stability.
The spatted undercarriage legs were cantilevered from the engine nacelles and the fuselage under the nose with the main wheels fitted with 'Bendix' pneumatic brake units and the nosewheel steerable from the rudder bar.
Flight trials were scheduled to be carried out in December 1939 but the incomplete prototype was destroyed in an air raid during the German invasion of 1939.