The BT-13 Valiant was a World War II-era basic trainer aircraft built by Vultee Aircraft for the United States Army Air Corps. The Vultee BT-13 was the basic trainer flow by most pilots during WWII. It was the second phase of the three phase training program for pilots. After primary training, the student pilot moved to the more complex Vultee. The BT-13 had a more powerful engine and was faster and heavier than the primary trainer. It required the student pilot to use two way radio communications with the ground and to operate landing flaps and a two-position variable pitch propeller. Its pilots nicknamed it the "Vibrator." Mahogany Wood. Wingspan 16 3/4 inches, Length 11 1/2 inches.