So many inventors, inspired and enthousiastic, aimed at build their own hot air engine. A venture that often went bust.
The hall of fame of hot air engines will be presented. What did their success will be exposed.
An overview of many of the numerous patents will be given, with emphasis on their point of interest, their strengthes and their weeknesses.
As far as possible, the purpose of each invention will be explained : what is, from the point of view of the inventor, the improvement that was pursued.
A discussion will follow.