In 1932 the Polish ministry of Transport let it be known that they wanted a multi-engined feeder-liner to operate low frequency routes with challenging.

Two airframes were built, with one intended for static testing, the low-wing cantilever monoplane was of mixed construction with a one-piece two-spar wooden wing, tapering in chord and thickness, covered with plywood forward of the mainspar and the under sides with fabric covering the rest.

The cockpit had excellent visibility for the two pilots who sat side by side forward of the comfortable passenger compartment which seated six in three pairs on adjustable seats, with electric lighting, controlled ventilation and controlled heating from heat exchangers on the engine exhausts.

Two retractable main undercarriage legs were fitted with oleo-pneumatic shock-absorbers, medium pressure braked Dunlop wheels, as well as the non-retractable castoring Dowty tailwheel.

During flight trials it was noticed that the RWD-11 was prone to wing flutter which built up gradually as speed increased, giving plenty of warning, so the RWD 11 was fitted with a rudimentary vibration recorder using a modified phonograph recorder, for research into flutter.