Powerplant: 2 × Hiro Type 91 water-cooled W12 engine, 480 kW (650 hp) each
Maximum speed: 266 km/h (165 mph, 143 kn)
Range: 4,408 km (2,739 mi, 2,380 nmi)
Service ceiling: 4,600 m (15,100 ft)
Time to altitude: 16 min 54 sec to 3,000 m (9,800 ft)
Guns: 2× flexibly mounted 7.7 mm machine guns (one mounted in the nose and one in dorsal position)
The sole prototype G1M, initially designated Mitsubishi Navy Experimental 8-Shi Special Reconnaissance Aircraft and re-designated Mitsubishi Navy Experimental 8-Shi Land based Medium Attack Aircraft before first flight, was a predecessor of the Mitsubishi G3M, an important step for the Navy air force towards more capable land-based bombers such as the Mitsubishi G4M “Betty”.
There is sometimes confusion between this aircraft and the Mitsubishi 3MT5 (also designated ‘Mitsubishi G1M’ and ‘Navy Experimental 7-shi Carrier Attack Bomber’).
The 3MT5 was a biplane and the 8-shi experimental Attack Bomber was a monoplane, two entirely different aircraft.