Grumman began designing the G-42 in mid-1939 as a successor to the J2F Duck but as a consequence of wartime priorities this was transferred to Columbia as the Columbia JL.
A total of three were produced.
XJL-1 Type: 6 place military utiliy amphibian Engine: 1 x Wright R-1820-56 Cyclone, 1200 hp Prop: 3 blade CS metal Max speed: 174 mph Cruise speed: 119 mph Range: 2070 miles MTOW; 13,000 lb Wing span: 50 ft 0 in Length: 45 ft 11 in