Curtiss A-3 Falcon - version overview:
A-3 - a combat variant of the O-1B reconnaissance aircraft
A-3A - training modification
A-3B - upgraded variant
XA-4 - experimental prototype with Pratt & Whitney Wasp engine
A-5 - planned version with Curtiss Conqueror engine
A-6 - planned version with Curtiss Chieftain engine
O-1 Falcon - observation version
F8C Falcon, Helldiver - fighter/bomber version for the Navy
Source:
http://www.aerofiles.com/_curt.html
http://en.wikipedia.org/wiki/Curtiss_Falcon
A-3 - a combat variant of the O-1B reconnaissance aircraft
A-3A - training modification
A-3B - upgraded variant
XA-4 - experimental prototype with Pratt & Whitney Wasp engine
A-5 - planned version with Curtiss Conqueror engine
A-6 - planned version with Curtiss Chieftain engine
O-1 Falcon - observation version
F8C Falcon, Helldiver - fighter/bomber version for the Navy
Source:
http://www.aerofiles.com/_curt.html
http://en.wikipedia.org/wiki/Curtiss_Falcon