The Albatros Dr.I was a German fighter triplane 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 standard D.V biplane in comparison trials. There was no discernible performance advantage and development was halted at the prototype stage.
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References
Gray, P. and Thetford, O. German Aircraft of the First World War. London: Putnam, 1962 Green, W. & Swanborough, G. The Complete Book of Fighters. London: Salamander Books, 1994