Only Coanda 1910 unsuccessful in the entire Timeline of aircraft engine development Quite strange I have noticed that the entire timeline of aircraft development ranging from 1848 to 2004 has a single engine labeled as unsuccessful All other motors are considered successful also many o them are in the same situation as Coanda 1910 More some engines never left the drawing board being years later developed by other inventors in efficient motors with major modifications I will delete the epithet unsuccessful because I consider it was not placed in good faith Coanda 1910 power plant itself was built worked and it was an original design