[250x]If you have a plane that weighs less than 125 kilo then you dont have to register it even if its a turbo jet. However there were no before such a small turbo jet plane  seemed impossible to build. & Read more...

http://englishrussia.com/2018/11/12/friends-have-built-an-ultra-light-real-turbo-jet-airplane-and-took-their-first-flight/