Agreed. When they were doing the re-creation of the Wright Flyer for its anniversary flight recently I was quite taken by just how primitive the engine was and

Agreed. When they were doing the re-creation of the Wright Flyer for its anniversary flight recently I was quite taken by just how primitive the engine was and how much mass there was just to get a few HP. The advancement in engine power to weight ratios over the next forty years is absolutely amazing if you consider how slowly things have moved for the previous hundred years.