variously designated as the O-59 (1941), L-4 (after April 1942) and NE (U.S. Navy). The L-4 Grasshopper was mechanically identical to the J-3 civilian Cub, but was distinguishable by the use of a Plexiglas greenhouse skylight and rear windows for improved visibility, much like the Taylorcraft L-2 and Aeronca L-3 also in use with the US armed forces. It had accommodations for a single passenger in addition to the pilot. When carrying only the pilot, the L-4 had a top speed of , a cruise speed of , a service ceiling of , a stall speed of , an endurance of three hours, and a range of . Some 5,413 L-4s were produced for U.S. forces, including 250 built for the U.S. Navy under contract as the NE-1 and NE-2.