Depends on the biplane. Developements in airplane technology was pretty impressive during the war.
For instance, the best fighter in the early stages of the war, the Fokker Eindecker E.III had a top speed of 87 mph (140 km/h) and a flight time of 1.5 hours. In 1915, this airplane was the terror of the skies. By the middle of 1916, the Eindecker was a relic - outdated and slow.
The Sopwith Snipe, introduced in 1918 had a top speed of 121 mph (195 km/h) and could fly for 3 hours.
The airplane Von Richtofen was shot down in, the Fokker Dr. I (triplane) had a top speed of 115 mph (185 km/h). It would stall out at the low speed of 75 mph.
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Some of the best bi-plane fighter aircraft of WW1 could fly 145 mph. The Fokker Dr.1 Triplane, by comparison, was a very agile aircraft and could climb very fast but it had a top speed of only 103 mph.
The same thing that makes a monoplane fly (i.e. lift), except a biplane has twice as many wings to do it with.
a biplane is a aircralt with 2 wings
Yes, a biplane is very aerodynamic,with lots of 'lift'
There are two sets of wings on a biplane. There is an upper and a lower wing set.
they fly at least 17000mph