Accordingly , a second prototype , which was designated as the P. 6 , was completed the next year .
The Polish War Ministry objected to the aircraft 's use of the licence - built Hispano - Suiza V engine , citing insufficient practicality and poor economic grounds .
A second prototype , which was designated as the P. 6 , was completed the next year .
The Polish War Ministry objected to the aircraft 's use of the licence - built Hispano - Suiza V engine , citing insufficient practicality and poor economic grounds .