RPF PREMIUM MEMBER
However it leaves it to speculation that Hughes is an inventor. He just didn't make the first jetpack and that was it. He had to again speculation build a few prototypes before finalizing the one we see in The Rocketeer Movie.
There were at least 2 earlier prototypes, but they would have been destroyed in the same accidents that killed the 2 test pilots. I just don't see the need to retcon when the movie tells us where the next version of the pack is coming from.