04/15/2021. Remarks by Johan Visschedijk: "In 1924 the Glenn L. Martin Company of Cleveland, Ohio, USA, developed their single-seat Model 66 Night Mail Plane of 1923, into the Model 67 two-seat primary trainer. Of wooden construction, covered with fabric, it had low-aspect ratio wings braced by single interplane struts, and could be fitted with a wheel or float landing gear. It was powered by a 200 hp Lawrance J-1 nine-cylinder air-cooled radial engine, driving a two-blade wooden fixed-pitch propellor. Subsequently the sole Model 67 was delivered to the USN under the BuNo A-6800, initially designated as NT-1, later as N2M-1. After acceptance trails, the aircraft saw limited service at NAS Pensacola, Florida, for only a few years."

Span: 42 ft 0 in (12.8 m)
Length (landplane): 27 ft 10 in (8.47 m)
Length (seaplane): 31 ft 2 in (9.52 m)
Height: 12 ft 1 in (3.68 m)
Wing area: 430 sq.ft (40 sq.m)
Chord: 5 ft 4 in (1.62 m)
Weight empty (landplane): 1,937 lb (880 kg)
Weight empty (seaplane): 2,091 lb (950 kg)
Weight loaded (landplane): 2,550 lb (1,160 kg)
Weight loaded (seaplane): 2,704 lb (1,245 kg)
Performance of landplane at 2,575 lb (1,170 kg) total load:
     Max speed: 112 mph (180 kmh)
     Min speed: 39 mph (63 kmh)
     Climb: 760 ft (232 m)/min
     Ceiling: 19,000 ft (5,800 m)