sentences:  In 1939, the LWS-7 Mewa II was being developed at the LWS as the development of the LWS-3 Mewa.New wings and a semi-monocoque fuselage with less drag were introduced.It was to be fitted with a more powerful 916 hp (683 kW) PZL Pegaz XX engine (Bristol Pegasus XX) or a planned 1000 hp (750 kW) PZL Waran.