Which was the greater technological leap: Hermes to Ark Royal, or Ark Royal to Invincible?
Short answerArk Royal to Invincible. Hermes and Ark Royal were different sizes but products of the same broad design era, whereas Invincible embodied a later carrier concept.
NotesThe question notices roughly twenty years between Hermes, Ark Royal, and Invincible. Hermes was a light fleet carrier and Ark Royal an Audacious-class fleet carrier, but both originated in broadly the same wartime design and development period. Their differing completion and service histories do not amount to a full generation of design progress between them. The more meaningful technological leap came with the Invincible class and its different conception of carrier operations.