Otherwise similar to the P. 7 which was produced in Poland under licence .
The P. 7 is the P. 11a mounted the 575 hp ( 429 kW ) Bristol Mercury IV S2 radial engine .
Otherwise similar to the P. 7 , the P. 11a mounted the 575 hp ( 429 kW ) Bristol Mercury IV S2 radial engine , which was produced in Poland under licence .