The
Zeppelin-Staaken R.VI was a four-engined
German biplane strategic bomber of World War I, and the only
Riesenflugzeug ("giant aircraft") design built in any quantity.
The R.VI was the most numerous of the R-bombers built by Germany, and also among the earliest closed-cockpit military aircraft (the first being the Russian
Sikorsky Ilya Muromets). The bomber was reputedly the largest wooden aircraft to be produced in any quantity during World War I, with only the
Siemens-Schuckert R.VIII prototype bomber of 1918–1919 being larger, with the Staaken R.VI's wingspan of 42.2 m (138 ft) nearly equaling that of the World War II
Boeing B-29 Superfortress, and somewhat less than the 48 m (157 ft) span of the Siemens-Schuckert R.VIII