The MB-3 first flew on 2 February 1919. Fifty were for the US Army (AS63331-AS63380), 10 for USMC (A6060 to A6069); plus 1 static and 3 flying prototypes (AS40092 to AS40095), and 4 production for tests at McCook Field (AS63332, and AS63336 and AS63337).
The 1922 MB-3A featured a new cooling system and four-bladed prop. First flying on June 7, 1922, 200 Morse MB-3A fighters (AS68237 to AS68436) were built by Boeing during 1921 -1922, contracted by the government in 1920. Some later became MB-3M advanced trainers. Design elements went into Boeing PW-9. In addition 50 were built by Thomas-Morse.
Three clipped-wing models were built in 1921, with one becoming MB-6 / R-2, and 10 for the USMC in 1921.
The MB-3B modified Boeing four-aileron design was cancelled.
Thomas-Morse MB-3
Engine: 300hp Wright-Hisso H
Wingspan: 26’0″
Length: 20’0″
Useful load: 823 lb
Max speed: 141 mph
Cruise speed: 125 mph
Range: 310 mi
Ceiling: 23,700′
Seats: 1
All Aero 