When did the Mk IIa series 1 Hurricanes first enter service ?
Hurricane Mk I First production version , with fabric - covered wings , a wooden two - bladed , fixed - pitch propeller , powered by the 1,030 hp ( 768 kW ) Rolls - Royce Merlin Mk II or III engines and armed with eight .303 in ( 7.7 mm ) Browning machine guns .