 {| |} the vultee bt-13 valiant was an american world war ii-era basic trainer aircraft built by vultee aircraft for the united states army air corps, and later us army air forces. a subsequent variant of the bt-13 in usaac/usaaf service was known as the bt-15 valiant, while an identical version for the us navy was known as the snv and was used to train naval aviators for the us navy and its sister services, the us marine corps and us coast guard.parker, dana t. building victory: aircraft manufacturing in the los angeles area in world war ii, pp. 107-120, cypress, ca, 2013. isbn 978-0-9897906-0-4. ==design and development== the vultee bt-13 was the basic trainer flown by most american pilots during world war ii. it was the second phase of the three phase training program for pilots. after primary training in pt-13, pt-17, or pt-19 trainers, the student pilot moved to the more complex vultee for continued flight training. 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 hamilton standard controllable pitch propeller. it did not, however, have retractable landing gear nor a hydraulic system. the flaps were operated by a crank-and-cable system. its pilots nicknamed it the "vultee vibrator." due to the demand for this aircraft, and others which used the same pratt & whitney engine, some were equipped with wright powerplants of similar size and power built in 1941-42. the wright-equipped aircraft were designated bt-15. the navy adopted the p&w powered aircraft as their main basic trainer, designating it the snv. the bt-13 production run outnumbered all other basic trainer (bt) types produced.herman, arthur. freedom's forge: how american business produced victory in world war ii, pp. 203, 262-3, random house, new york, ny, 2012. isbn 978-1-4000-6964-4.parker, dana t. building victory: aircraft manufacturing in the los angeles area in world war ii, pp. 107, 109, 111, 113-4, cypress, ca, 2013. isbn 978-0-9897906-0-4.borth, christy. masters of mass production, pp. 251, 252, bobbs-merrill co., indianapolis, in, 1945. in 1938, vultee chief designer richard palmer began designing a single-engine fighter aircraft. about that time, the army air corps issued a solicitation for an advanced 
Low-wing_aircraft Single-engined_tractor_aircraft United_States_military_trainer_aircraft_1930a1939 Vultee_aircraft World_War_II_trainer_aircraft_of_the_United_States