In October 1910, Henri Coanda exhibit at the Second International Aerospace Salon held in Paris, in the sumptuous Grand Palais on the Champs Elysée, propeller airplane without COANDĂ-1910. The airplane warned visitors both by its color, dark red, and the many original elements, including propeller lack of fierce debate among scholars as revolutionary means of propulsion presented was considered, at that time, as impossible. This paper presents several aspects of heuristic process that led to the invention of the jet engine by Henri Coanda, highlighting the psychological mechanisms involved in achieving this technical creations, stimulating factors and blockage that occurred in "mental laboratory" of the creator.