 The early shells of this type had contact fusing, detonating on contact with the skin of the airframe rather than penetrating, then exploding.The more streamlined Bf 109 F-1, issued in small numbers starting in October, carried two cowl MG-17s and a single 20mm MG FF/M in the fuselage as an engine-mounted "Motorkanone", firing through the propeller hub.A drawback of the Hurricane was the presence of a fuel tank just behind the engine firewall, which could catch fire and within a few seconds severely burn the pilot before he managed to bail out.