DFW R.II

The DFW R.II was a German bomber aircraft of World War I. It was developed at a request by the Luftstreitkräfte in spring 1917 after their experience with the R.I had been generally positive.

Design and development
The service desired generally similar aircraft but needed greater payload (3400 kg, up from 2600 kg in the R.I). This meant the design had to be considerably revised. The same engine/propeller arrangement was used (four inline engines mounted in the fuselage, driving two tractor propellers and two pusher propellers via long driveshafts).

When the R.II first flew in August 1918, the driveshafts proved troublesome, creating excessive vibration. As a remedy, they were enclosed within steel tubes, which fixed the problem. The aircraft also was able to benefit from the newly-available Mercedes D.IVa engine that had replaced the troublesome D.IV in production.

Operational history
Of the six ordered by the Luftstreitkräfte, only two were completed before the end of the war, and these were operated from Cologne on training duties only when their performance proved inadequate for front-line duties. Following the war, DFW planned an airliner version of the R.II, which would have carried 24 passengers. Construction of a prototype was abandoned before it was complete.