Question: When was the German pilot that built Udet U 1 born? 

Context paragraphs:
Manfred von Richthofen (sports official): Manfred von Richthofen (4 February 1934 – 1 May 2014) was a German hockey player and coach.  He was also an honorary President of German's national Olympic federation.  He was the nephew of World War I German pilot Manfred von Richthofen (the "Red Baron").  His career began during the 1950s.  He retired in 2006.  Richthofen was born in Berlin, Germany.

Udet U 1: The Udet U 1 is a single seat monoplane built by the German Ace Ernst Udet.

2016 Red Bull Air Race of Indianapolis: The 2016 Red Bull Air Race of Indianapolis was the seventh round of the 2016 Red Bull Air Race World Championship, the eleventh season of the Red Bull Air Race World Championship.  The event was held at the Indianapolis Motor Speedway, in Indianapolis, the United States.  German pilot Matthias Dolderer wrapped up his first championship with a round remaining, while Chilean pilot Cristian Bolton made his debut as a replacement for the late Hannes Arch.

Udet U 8: The parasol wing, single engine Udet U 8, sometimes referred to as the Limousine, was a three seat commercial passenger transport designed and built in Germany in 1924.  Five were produced and were used by German airlines until about 1928.

Ernst Udet: Ernst Udet (26 April 1896 – 17 November 1941) was a German pilot and air force general during World War II.

Udet U 12: The Udet U 12 Flamingo was an aerobatic sports plane and trainer aircraft developed in Germany in the mid-1920s.

Udet U 7 Kolibri: The Udet U 7 Kolibri (Hummingbird) was a single engine, single seat, parasol wing light aircraft, designed and built in Germany in the mid-1920s.  Though they had some competition success and set an unofficial lightplane duration record, only two were produced.

Udet U 11 Kondor: The Udet U 11 Kondor was a German four-engined airliner designed and built by Udet Flugzeugbau, only one was built.

Kurt Grasshoff: Kurt Grasshoff (January 24, 1891 – June 12, 1918) was a German pilot who commanded Jasta 37 in France and Jasta 38 in Macedonia in World War I.  He commanded German ace Ernst Udet in Jasta 37, and chose Udet to command the unit upon his transfer to Jasta 38.

SM U-1 (Germany): SM "U-1", also known in English as the German Type U 1 submarine, was the first U-boat class of the U-boat series of submarines produced for the German Empire's Imperial German Navy.  Only one was built.  The "U-1" was constructed by Germaniawerft in Kiel and was commissioned on 14 December 1906.  When World War I began in 1914, the "U-1" was deemed obsolete and was used only for training until 19 February 1919, when it was struck by another vessel while on an exercise.

Supporting paragraphs: Udet U 1 Ernst Udet
Answer: 26 April 1896