Ford 4-AT Tri-Motor - overview version[/heading]
4-AT-a - first variant, digit třímotorový transport aircraft, engines Wright J-4, built 14 pieces
4-AT-B - a variant with increased wingspan and take off weight, engines Wright J-5, built with 39 pieces
4-AT-C - one 4-AT-B with a Wright in the bow replaced by an engine Pratt & Whitney Wasp
4-AT-D - one machine with a modified wing, two more conversion
4-AT-E - engines of the Wright J-6-9, built 17 machines
4-AT-F - one machine with increased take-off weight and minor changes
4-AT-G - one 4-AT-E modified for diesel engines, renamed to 11-AT
C-3 - designation 4-AT-AND purchased the USAAC
C-3A - the seven machines of the corresponding 4-AT-E built for the USAAC, taken with engines Wright R-975-1 as a C-9
XJR-1 - the fourth 4-AT-AND purchased the US Navy
JR-2 - two 4-AT-E purchased by the US Navy for the Marine corps, in 1931 renamed to RR-2
Larkins, William T. The Ford Tri-Motor 1922-1992. Schiffer Publishing, West Chester, 1992. ISBN 0-88740-416-2.
http://www.aerofiles.com/_ford.html
.
http://www.aerofiles.com/_ford.html