 When it did work, however, the Hispano was an effective weapon, with its shells easily able to penetrate the armour plating and self-sealing fuel tanks of "Luftwaffe" aircraft.The Emil's main armament depended on the subtype.The E-1 was armed with four MG 17 7.92mm machine guns; two cowl guns above the engine with 1,000 rounds per gun, and two in the wings with 500 rounds per gun.