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The Siemens was best known for its phenomenal rate of climb. During the First Fighter Competition of January 1918 (which the German Military held to select the most promising fighter aircraft for its air force), the Siemens DIII outmaneuvered a Fokker DVII prototype flown by Manfred von Richthofen. In June of 1918 at the Second Fighter Competition, the Siemens outmaneuvered a Fokker DVIII prototype flown by Anthony Fokker himself.
Considered by many to be the best fighter to see action during the war, it reached service too late and was produced in too few numbers to have any effect on the war effort.
Although the short landing gear and limited prop clearance led to tricky landing, the plane was otherwise easy to fly. It had a very short take-off run, and at heights above 4,000 m (13,l20 ft) was faster and more manoeuvrable than the Fokker D.VII, at that point considered by all to be the best aircraft flying. Its most notable feature was its phenomenal rate of climb and extremely high service ceiling - it could reach 6,000 m (19,685 ft) in less than 14 1/2 minutes. In 36 minutes it could reach 8,100m, about 1,200 higher than the Fokker's maximum altitude.
dinos7 said:definately the DR1