Editing Curtiss Falcon (section)

==Variants==
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===U.S. Army Air Corps===
;A-3: Model 44, [[attack aircraft]] version of O-1B, armed with two 0.30&nbsp;in (7.62&nbsp;mm) machine guns and 200&nbsp;lb (91&nbsp;kg) of bombs; 66 built for the USAAC.
;A-3A: Six A-3s converted into trainers.
;A-3B: Model 37H, attack version of O-1E, with six machine guns, including two mounted in wings; 78 built.
[[File:Curtiss XA-4 parked.jpg|thumb|right|Curtiss XA-4 Falcon]]
;XA-4: One A-3 with a [[Pratt & Whitney R-1340-1]] Wasp radial piston engine. Scrapped in March 1932, but the design was the basis for the naval variants.
;A-5: Proposed A-3 variant with [[Curtiss V-1570 Conqueror]] engine
;A-6: Proposed A-3 variant with [[Curtiss H-1640 Chieftain]] engine
[[File:Curtiss XBT-4.jpg|thumb|right|XBT-4]]
;XBT-4: Model 46, one O-1E converted into a basic trainer for the USAAC.
;XO-1:Liberty 12A powered Prototype, later modified to use a Packard 1A-1500, one built.
;O-1: Model 37A, two-seat observation aircraft, the first production model, ten built. One converted into the '''O-1 Special''' VIP transport.
;O-1A: Two-seat observation aircraft, powered by the Liberty piston engine, one built.
;O-1B: Model 37B, first major production version, powered by [[Curtiss D-12D]] (V-1150-3) engine; 45 ordered, 25 built and 20 diverted on the production line to the A-3.
;O-1C: Four O-1Bs converted into VIP transports.
;O-1E: Model 37I, variant powered by {{cvt|435|hp}} [[Curtiss D-12E]] (V-1150-5) piston engine; 41 built.
;O-1F: Model 37J, one O-1E converted into VIP transport.
;O-1G: Model 38, final O-1 variant, powered by a {{convert|712|hp|kW|abbr=on}} [[Wright R-1820 Cyclone|Wright R-1820F-2 Cyclone]] engine; 30 built for USAAC.
;XO-11: Two O-1 modified as O-11 prototypes.
;O-11: O-1 airframe powered by the Liberty V-1650 piston engine; 67 built concurrently with the O-1s.
;XO-12: One XO-11 prototype redesignated XO-12.
;XO-13: O-1 fitted with {{cvt|720|hp}} Conqueror engine for the 1927 [[National Air Races]].
;XO-13A: Second XO-13, fitted with wing skin radiators.
;O-13B: One O-1C fitted with a Conqueror engine, tested as an observation aircraft, and provided to Secretary of War.
;YO-13C: Three O-1Es re-engined with {{cvt|600|hp}} direct-drive Conqueror engines.
;YO-13D: One O-11 fitted with supercharged Conqueror engine.
;XO-16: One O-11 with Prestone cooling system.
;XO-18: One O-1B testbed for [[Curtiss H-1640 Chieftain]] engine.
;Y1O-26: One O-1E fitted with a geared Conqueror engine.
;O-39: O-1G refitted with a Conqueror engine and cockpit canopy; ten built.

===U.S. Navy and Marine Corps===
[[File:Curtiss OC-2 Falcon.jpg|thumb|Marine Corps Curtiss OC-2 Falcon, c. 1929]]
[[File:Curtiss XF8C-2.jpg|thumb|right|The XF8C-2 prototype]]
[[File:Curtiss XF8C-4.jpg|thumb|right|The XF8C-4 prototype]]
[[File:Curtiss F8C-5 Formation, circa 1930.jpg|thumb|Curtiss F8C-5 Formation, circa 1930]]
[[File:Curtiss XF8C-7.jpg|thumb|right|The XF8C-7]]
;A-3 Helldiver: Registry name of XF8C-8, not adopted by USN.
;A-4 Helldiver: Civil version of XF8C-8 for use by Assistant Secretary of Navy [[David Ingalls]]. Later redesignated XF8C-7.
;XF8C-1: Model 37C variant developed from XO-12; two built for the U.S. Navy.
;F8C-1 Falcon: Model 37C powered by the {{cvt|420|hp}} [[Pratt & Whitney R-1340 Wasp]] radial piston engine; four built in 1928 for the [[United States Marine Corps|U.S. Marine Corps]] as light bombers, fighters and observation aircraft, later redesignated '''OC-1'''.
;XF8C-2: Model 49, one prototype for F8C Helldiver. Original crashed on first factory flight and was replaced by Curtiss with a second bearing identical sn.
;F8C-3 Falcon: Second production batch of Navy Falcons; 21 built for USN/USMC in 1928, later redesignated '''OC-2'''.
;XF8C-4: Second Helldiver prototype, modified tail skid assembly.
;F8C-4 Helldiver: Model 49B, production dive-bomber variant for the USN/USMC; 25 built, later designated '''O2C'''.
;F8C-5 Helldiver: Model 49B with ring cowling; 63 built in 1930–31, later designated O2C-1.
;XF8C-6: Two F8C-5s modified with superchargers, slats, and wing flaps; one later modified as O2C-2.
;XF8C-7: Redesignation of A-4 Helldiver, later redesignated XO2C-2.
;XF8C-8: Two prototypes built with canopy-enclosed front cockpit, later redesignated '''O2C-2'''.
;O2C-1 Helldiver: Redesignation of 63 F8C-5; 30 production O2C-1s in 1931.
;O2C-2 Helldiver: Redesignation of XF8C-8s and one XF8C-6.
;XOC-3: One XF8C-1 prototype fitted with a Chieftain engine.
;XF10C-1:O2C-2 re-engined with a R-1510 engine, also temporary designated '''XS3C-1'''.

===Civil and export===
;Civil Falcon: 20 civil versions: Conqueror [[Mail plane]]; D-12 Mailplane; ''Lindbergh Special'', sold to [[Charles Lindbergh]]; Liberty Mailplane, 14 single-seat mailplanes, powered by a Liberty piston engines, sold to [[National Air Transport]].
;Export Falcon: also '''South American D-12 Falcon'''. One seaplane version of the O-1B was sold to [[Colombia]], followed by an order for 15 more. Another 10 Model 35Fs were sold to [[Peru]].<ref>{{Harvnb|Bowers|1979|p=311.}}</ref>
;Colombia Cyclone Falcon: Model 37F fitted with the {{cvt|712|hp}} [[Wright Cyclone]] radial piston engine. 100 built for Colombia.
;Chilean Falcon: O-1E design built under license in [[Chile]], 10 later sold to [[Brazil]]. One example ended up in Paraguay as passage fee for the remaining aircraft. It operated mostly as a VIP transport, but made at last one reconnaissance flight over the Chaco war fields armed with two {{cvt|7.7|mm|3}} machine-guns from a Potez.
;Bolivia Cyclone Falcon: Similar to Colombian Falcon, it was fitted with the {{cvt|712|hp}} [[Wright SR-1820F-2 Cyclone]] radial piston engine. A total of nine were built for Bolivia in some odd variants from the Colombian ones. Bolivian Cyclone Falcons mounted one frontal .30 MG and most also one rear .30 MG instead of the two wing-mounted ones. Two had semi-cockpit canopies over pilots cockpit; two had windscreens instead of canopy in both cockpits, these two had no ring mount for rear machine gun.