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 utility 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
All Aero 