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. After its service lifetime, the R.IV became a Riesenflugzeug trainer.