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Stinson L-1 Vigilant

Stinson L-1 Vigilant, a two-seat high-wing monoplane observation aircraft developed for the USAAF. For high-lift performance the wing has full-span leading-edge automatic slats, wide span trailing edge flaps and slotted ailerons than can droop 20 degrees when the flaps are fully down. First flown in 1937. Dimensions 50.11/ 34.3/ 10.2/ 329 sq ft; 285hp Lycoming R-680-9 radial; max speed 122mph; service ceiling 12,800ft; max range 280 miles.
Variants and production figures:
142 L-1
182 L-1A with longer fuselage, equipment changes
3 L-1B three L-1 aircraft converted to carry a stretcher in the ambulance role
5 L-1C fitted with Edo floats

Aeronca L-3 Grasshopper

Aeronca L-3 Grasshopper, a two-seat tandem seating high-wing monoplane spotter based on the Model 65.
Variants and production figures: 50 L-3, 20 L-3A and 335 L-3B
Dimensions 35/ 21.10/ 9.1/ 169 sq ft; 65hp Continental O-170-3; max speed 87mph; service ceiling 10,000ft; normal range 218 miles.

Piper L-4 Grasshopper

Piper L-4 Grasshopper, a two-seat high-wing light aircraft variant of the Cub.. Dimensions 35.2/ 22.4/ 6.8/ 178.5 sq ft; 65hp Continental O-145; max speed 87mph; cruising speed 75mph; service ceiling 11,500ft; range 260 miles.
Variants and production figures: 40 L-4, 48 L-4A with better visibility and reduced radio equipment