Specifications for the Ki-28 were
Crew 1.
Length 12 Mtrs.
Wingspan 7.9 Mtrs.
Wing area 19 Sq Mtrs.
Height 2.6 Mtrs.
Empty weight 1420 Kgs.
Max Take off Weight 1760 Kgs.
Power Plant 1 x Kawasaki Ha-9-IIa 800hp 12 cyl in line liquid cooled engine.
Max Speed 485 km/hr.
Range 1000 Km.
Ceiling 11000 Mtrs.

The Ki-28 was Kawasaki's competitor to fill a requirement for a replacement fighter in 1935 for the Japanese Army Air Force (JAAF). It was pitted against the Mitsubishi Ki-33 and the Nakajima Ki-27. All three aircraft were low wing monoplane design and similar in performance but the Ki-27 won out due to its manoeuverability. The Ki-28 was powered by an 800 hp Kawasake Ha-9-IIa liquid cooled engine. Ref Japanese Aircraft of the Pacific War by Rene J Francillon.

In 1937 based on the experiences from the Ki-5, a low-wing all-metal monoplane, but the army favoured Nakajima Ki-27 & give up this one.