Hi Carmen,
>I'm writing a book about the PT-19, and I keep running across the statement that the Army Air Corps decided to move to it from the Boeing-Stearman because the PT-19 offered more advanced training than previous trainers -- a necessity in order to prepare them to fly against "the increasingly high-performance nature of the world's combat aircraft."
>What would these high-performance aircraft have been? I'd like to explain specifically what aircraft led them to decide they needed to advance their training to stay competitive with Axis training and combat.
Hm, it looks to me as if the "against" in your first paragraph (which appears not to be part of the original quote) might not be just what the original source meant to convey.
Normally, trainer aircraft were designed to be challenging to fly without being truly dangerous. It was OK for a WW2-era trainer to have some quirks that were typical for the high-performance aircraft of the era since the pilots were expected to be able to handle those quirks in high-performance aircraft, too. A flawlessly behaving trainer would not prepare the student pilots for the real thing, and you might have encountered the popular quote "If you can fly an AT-6, you can fly everything".
However, I admit that the above considerations mainly concern advanced trainers like the AT-6, and the PT-19 carried a primary trainer designation. It probably was not necessary for the type to emulate the quirks of the high-performance aircraft as it served as a platform for training and evaluating the basic flying talents of the students.
As biplanes like the PT-17 had their own set of ideosyncacies you wouldn't find on a high-performance monoplane, and the PT-19 as a low-wing monoplane design might have been slightly closer in handling to the types the students were trained to fly, but from what I've read, in the early stages of the flight training this probably didn't matter much.
PR statements aside, I presume that the PT-19 simply promised better cost efficiency in training than earlier types. Not that I'm familiar with the exact chronology of USAAC training aircraft procurement ...
Regards,
Henning (HoHun)