The Albatros Dr. I was a Germanfightertriplane derivative of the D.V fitted with three pairs of wings instead of two. Identical in most other respects to the D.V, in the summer of 1917 it was flown side by side with the existing biplane in comparison trials. There was no discernible performance advantage and development was halted at the prototype stage.
Green, W. & Swanborough, G. (1994). The Complete Book of Fighters. London: Salamander Books. ISBN 1-85833-777-1