The BT-13 is an American WWII era Basica Trainer. It is a fixed-gear, low-wing tail-dragger with a crew of two sitting in tandem. When production ended in 1944, approximately 11,537 Valiants had been built. The BT-13 was the most widely used trainer aircraft in WWII.

 

It was flown by most American pilots in transitioning from Primary trainers like the PT-19 to more advanced trainers like the AT-6.  The BT-13 was more complex than the Primary trainer and required the use of two-way radio, landing flaps and a two-position, and had a  controllable-pitch prop.

 

The BT-13 was nick-named the “Vultee Vibrator” by its pilots for its most remarkable characteristic- a tendency to shake violently as it approached stall speed.