The prototype was constructed using parts of a broken up RWD-6 (initially it was even supposed to be designated RWD-6bis), but its construction was more similar to newer RWD-9.
Prototipul a fost construit refolosind părți dintr-un RWD-6 accidentat (inițial s-a vrut o variantă RWD-6bis), dar construcția sa era mai asemănătoare cu mai noul RWD-9.