Model Variants (Including Prototypes)
Model 48 - Vultee company designation
P-66 "Vanguard" - Base Series Designation of USAAC/USAAF trainer version.
V-48 - Original prototype model
V-48X - Second prototype with modified wings and tail unit.
V49C - Export model for Sweden
Vanguard I - British Royal Air Force (RAF) designation; evaluated, not used operationally.