The Fokker V.4
Fokker V.4 / FI / Dr-I
The V.4 was a modified V.3 and had connecting struts between the wings.
The aircraft was built in mid-1917 and was initially given the Fokker designation FI (the F.1 101/17 through F.1 103/17).
But the aircraft became generally known as the Dr-I (Dreideker-I).
By May 1918, 320 units were built, although another source mentions 600.
The car company (?) Sarotti built the Dr-1 under license as the FI or SP-5. This type had a different rudder.
Many famous German pilots flew a Dr-I, such as Udet, Von Richthofen, Von Gontermann and Boelcke.
Von Richthoven flew a bright red Dr-I and was therefore nicknamed 'the Red Baron'.
He achieved 80 victories, 40 of which were in a Dr-I.
The pilots were not always happy with Fokker:
On October 30, Von Gontermann wanted to test one of the new Dr-Is. He quickly ascended to 700 meters.
There he started performing stunts. After his second loop, he turned downwards into a left turn.
Its upper wing failed, broke off and made the aircraft uncontrollable, causing it to crash.
Von Gontermann was pulled from the wreckage alive. He had sustained serious head wounds from the onboard machine guns.
He died a few hours later at the local dressing station.
Von Gontermann was not the first pilot to die during a test flight of the Dr-I.
Anthony Fokker was accused of shoddy construction of the aircraft and was ordered to improve production.
Source:
http://www.forumeerstewereldoorlog.nl/wiki/index.php/Heinrich_Gontermann
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