The Blohm & Voss BV 138 Seedrache (Sea Dragon, but nicknamed Der Fliegende Holzschuh ("flying clog", from the side-view shape of its fuselage) was a World War II German trimotor flying boat that functioned as the Luftwaffe's main long-range maritime reconnaissance aircraft.
The first BV 138B-1 took off and the air took off in December 1940. and turned out to be much better than its predecessor. The bow armament included a 20 mm MG 151 cannon and an MG 15 machine gun behind the central engine nacelle in the open position. The factory version (BV 138В-1 / U1) added the ability to carry six bombs or depth mines.
Source: Unlimited Technology
