Siemens-Schuckert R.IV

The Siemens-Schuckert R.IV was a one-off Riesenflugzeug (Giant Aeroplane) with serial number R4/15. It was preceded by three earlier planes, but those were never used operationally. It was accepted in August 1916 and it served with Rfa 501 at Vilna on the Russian Front.