Which jet engine was invented first?
Sir Frank Whittle patented his design in 1930 and built a jet
engine which first ran in 1937, Hans von Obain patented his design
in 1936 and built and ran one also in 1937, but 5 months after
Whittle had built his.
Hans von Obain's invention that powered a specially built
Heinkel in August 1939. Sir Frank Whittle's similar (and arguably
the more successful design) first flew in a Gloster in May 1941.
That engine was dubbed the "W1" and the aircraft was a
"Pioneer"