There is a gallery at the RAF Museum at Hendon that is focused on the Great War. This was the early days of aviation, and the development was so rapid that an aircraft might have an operational life of less than a year before something newer and better would replace it. Because so little was known at this point, experimentation with all sorts of ideas took place. Consequently, the types in this gallery have some wildly varying configurations. Pushers and tractors are on show. The sizing of some surfaces is huge compared to what would be expected now. They are really interesting to look at and see what ideas look relevant now and what has been abandoned. Here are some of the various types on display.