SO - Scout Observation Aircraft

Model	Designation	Manufacturer	Engine(s)	Crew	Other
SOC-1	Seagull	Curtiss	1 Pratt & Whitney R-1340-18 Wasp	2	XO3C-1
SOC-2	Seagull	Curtiss	1 Pratt & Whitney R-1340-22 Wasp	2
SOC-2A	Seagull	Curtiss	1 Pratt & Whitney R-1340-22 Wasp	2
SOC-3	Seagull	Curtiss	1 Pratt & Whitney R-1340-22 Wasp	2
SOC-3A	Seagull	Curtiss	1 Pratt & Whitney R-1340-22 Wasp	2
SOC-4	Seagull	Curtiss	1 Pratt & Whitney R-1340 Wasp	2
XSO2C-1	Seagull	Curtiss	1 Pratt & Whitney R-1340 Wasp	2
XSO3C-1	Seagull	Curtiss	1 Pratt & Whitney R-1340 Wasp	2	XSO3C-1 Seamew
XSO3C-1	Seamew	Curtiss	1 Pratt & Whitney R-1340 Wasp	2	XSO3C-1 Seagull
SO3C-1	Seamew	Curtiss	1 Ranger V-770-6	2
SO3C-1B	Seamew	Curtiss	1 Ranger V-770-6	2
SO3C-1K	Seamew	Curtiss	1 Ranger V-770-6	0
SO3C-2	Seamew	Curtiss	1 Ranger V-770-8	2
SO3C-2C	Seamew	Curtiss	1 Ranger V-770-8	2
SO3C-3	Seamew	Curtiss	1 Ranger V-770-8	2
SO3C-4	Seamew	Curtiss	1 Ranger V-770-8	2	cancelled
XSOE-1		Bellanca	1 Wright R-1820-84 Cyclone	2
XSOK-1		Fairchild	1		cancelled
SON-1		Naval Aircraft Factory	1 Pratt & Whitney R-1340-22 Wasp	2
SON-1A		Naval Aircraft Factory	1 Pratt & Whitney R-1340-22 Wasp	2
SOR-1		Ryan	1 Ranger V-770-6	2	cancelled
XSO2U-1		Vought	1 Ranger V-770-4	2