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.
Prototip je konstruiran od dijelova neispravnog RWD-6 (koji je prvobitno trebao biti imenovan kao RWD-6bis) a tijekom izrade avion je sve više sličio na RWD-9.