The last two LB designations covered seven LB 13s with 525 hp Hornets (redesignated in 1930 as five Y1B 4s and two Y1B 6s) and three LB 14s with 575 hp Hornets (redesignated as Y1B 5s).
The last two LB designations covered seven LB 13s with 525 hp Hornets (redesignated in 1930 as five Y1B 4s and two Y1B 6s) and three LB 14s with 575 hp Hornets (redesignated as Y1B 5s).