The Albatros D.IV was an experimental German fighter aircraft built and tested during World War I. 
Design and development.
The D.IV was designed to test a geared version of the 120 kW (160 hp) Mercedes D.III engine. Unlike the ungeared version, the geared engine was completely enclosed within the fuselage. The airframe basically combined the D.II wing cellule with the D.Va fuselage.
Three examples were ordered in November 1916, but only one was flown. It was tested with several types of propeller, but excessive vibration problems and limited performance increase precluded further development.
Specifications.
"Data from" "German Aircraft of the First World War and The Complete Book of Fighters".General characteristics* Crew: 1* Propellers: 2-bladed wooden propeller
Performance* Endurance: 2 hours 12 minutes* Time to altitude: in 32 minutes
See also.
Aircraft of comparable role, configuration, and era
Related lists
Notes.
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