only coanda unsuccessful in the entire timeline of aircraft engine development quite strange i have noticed that the entire timeline of aircraft development ranging from to has a single engine labeled as unsuccessful all other motors are considered successful also many o them are in the same situation as coanda 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 power plant itself was built worked and it was an original design