The first O-19B was converted to the sole Y1O-33 on May 4, 1931, fitted with revised tail surfaces and a 600 hp Curtiss V-1570-11 Conqueror twelve-cylinder Prestone-cooled V-engine replacing the original 450 hp Pratt & Whitney R-1340-7 Wasp nine-cylinder air-cooled radial.
The last prototype designed by B.D. Thomas with the Thomas-Morse name was a sesquiplane (small lower wing) known as the XO-932 when first flown on May 4, 1931. A geared, Prestone-cooled Conqueror in a neat cowl, N struts, and wheel pants were featured.
Later this aircraft was fitted with new sesqui-wings, while the Conqueror was geared, and the aircraft, tentatively designated Y1O-41, was tested at Wright Field, Ohio, in June 1931 on a Bailment Contract as the XO-932.
That model was rejected by an Army board because the basic structure seemed weak and the board now believed that “a monoplane is the most desirable type for ¬observation purposes because of its superior qualities of vision.” While not sold to the Army, the aircraft received the YlO-41 designation 30-90.
Thomas-Morse had become a division of Consolidated in 1929 and was discontinued in 1934, the year the XO-932 was stripped of its military equipment and rebuilt as the Consolidated 23 on September 21, 1934. Registered NR33Y the aircraft was used as a company transport till it was sold to Colonel Alfredo Lezama Alvarez of Mexico in December 1936, where it was registered as XA-DBX.
The last aircraft produced by Thomas-Morse the fate of the XO-932 sesquiplane of 1932 is unknown.
Y1O-33
Engine: Curtiss V1570-11, 600 hp
Wingspan: 39 ft 9 in
Wing area: 348 sq,ft
Length: 29 ft 2 in
Height: 10 ft 2 in
Empty weight: 3130 lb
Gross weight: 4291 lb
Fuel capacity: 77.5 USG
Top speed: 165 mph at SL / 158 mph at 10,000 ft
Cruise speed: 143 mph
Landing speed: 58 mph
Service ceiling: 22,600 ft
Absolute ceiling: 24,000 ft
Rate of climb: 1840 fpm
Climb to 10,000ft: 6 min
Range: 443 mi
XO-932
Engine: Curtiss V1570-29, 600 hp
Wingspan: 40 ft 8 in
Wing area: 299 sq,ft
Length: 29 ft 3 in
Height: 10 ft
Empty weight: 3254 lb
Gross weight: 4394 lb
Fuel capacity: 79 USG
Top speed: 188 mph at SL / 181 mph at 10,000 ft
Service ceiling: 24,250 ft
Absolute ceiling: 25,500 ft
Rate of climb: 1840 fpm
Climb to 10,000ft: 6.9 min
All Aero 