 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.At the time of the German invasion of Poland in September 1939 the RWD-11 was in use as an executive aircraft for the company, but suffered a collapsed undercarriage during taxiing, being left behind for capture by German forces.The RWD-11 was sent to Germany and was seen later near Berlin in German markings but did not survive World War II.