The 1941 Vultee-Stinson V-76 NX27772 was a modified Stinson 105 with a 185hp Lycoming O-435 engine. Designed by A P Fontaine, it was first flown on 28 June 1941, piloted by Al Schramm, it was equipped with full-span slots, which created a problem during testing with near-fatal results.

 

With modification to half-span slots and enlarged tail surfaces it became final prototype for the Stinson L-5.