The tragedy occurred at the 28th annual Börgönd Aeroplane Day, claiming the lives of the 67-year-old pilot and his 37-year-old son also on board. A criminal investigation has been launched to find out what caused the incident.
In the early 1920s, Fonó’s attention turned back to the unresolved problem of jet propulsion. By that time, it had become entirely evident that propeller-driven aircraft were unable to exceed a certain speed limit. In 1928, Fonó developed his invention called the ‘air jet engine.’