Complete two-engine nacelle of the Zeppelin-Staaken R-VI aircraft. It was a four-engined German biplane strategic bomber of World War I, and the only Riesenflugzeug ("giant aircraft") design built in any quantity (18 were built). The R.VI was a 2nd designed closed-cockpit military aircraft and the largest wooden aircraft produced in any quantity during World War I. The engine nacelle in the photo comes from an aircraft built at the Albatros plant, which crashed in March or April 1918 in Belgium while returning from a bombing raid.