Stinson O-49 Vigilant - an overview of the versions:[/heading]
-49 - the initial version, viewing and connecting aircraft 142 pcs
ABOUT-49A - other serial version with extended fuselage and 24V wiring, 182 pcs
O-49B - four O-49A modified on ambulances
L-1 - indication On-49 used since the year 1942
L-1A - označeí O-49A used from 1942
L-1B - designation of O-49B used from 1942
L-1C - engine modified in the ambulance with hatch for stretchers in the upper part of the hull and the glazing in the rear of the cab replaced by a metal plate, other 113 the conversion of L-1A, probably used without changing the designation
L-1D - 21 L-1A modified for training capture gliders
L-1E - 7 L-1 adjusted to an ambulance and equipped with amphibious floats EDO, winter coat and handles for transport on ships
L-1F - original L-1C, and four other L-1A modified similarly as the previous version
L-1T - unknown number of machines modified for towing two or three gliders (usually Piper TG-8 or similar)
CQ-2 - a small amount of L-1A or L-1F used for control of flying targets
Vigilant Mk.I - 10 O-49 transferred Uk
Vigilant Mk.IA - 8 O-49A transferred Uk
Nb. the manufacturer, at that time a division of Vultee, sometimes referred to as the Vultee-Stinson or just Vultee
Wegg, John. General Dynamics Aircraft and their Predecessors. Naval Institute Press, Annopolis 1990. ISBN 0-87021-233-8.
Wakefield, Ken. The Fighting Grasshoppers US liaison Aircraft Operations in Europe 1942-1945. Leicester 1990. ISBN 0-904597-78-4.
Fahey, James C. In.With. Army Aircraft 1908-1946. Ships and Aircraft, Falls Church, 1964.
Adcock, Al. US Liaison Aircraft in action, In Action Well.195. Squadron/Signal Publications, Carrollton, Texas, 2005. ISBN 0-89747-487-2.
.
Wakefield, Ken. The Fighting Grasshoppers US liaison Aircraft Operations in Europe 1942-1945. Leicester 1990. ISBN 0-904597-78-4.
Fahey, James C. In.With. Army Aircraft 1908-1946. Ships and Aircraft, Falls Church, 1964.
Adcock, Al. US Liaison Aircraft in action, In Action Well.195. Squadron/Signal Publications, Carrollton, Texas, 2005. ISBN 0-89747-487-2.