The Hansa-Brandenburg W.13 was a flying boat bomber developed in Germany in 1917 and used by the Austro-Hungarian Navy during World War I. It was a largely conventional design for the time, with a single-step hull and an engine mounted pusher-fashion on struts in the interplane gap. The pilot and a gunner sat in tandem open cockpits at the bow. The interplane struts were unusual in that on each side of the aircraft, the upper and lower wings were braced with two pairs of struts that converged from two sets of attachment points on the upper wing to a single set on the lower wing, so that when viewed from fore or aft, the struts formed a V-shape. The type was first offered to the Imperial German Navy, but was rejected. It was, however, accepted by the Austro-Hungarian Navy, which operated it