Mitsubishi Ki-33
1936
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Mitsubishi Ki-33

The acceptance of the Ka-14 9-Shi fighter by the Imperial Navy and evaluation of a modified prototype of this aircraft as the Ki-18 by the Imperial Army encouraged the formulation by the latter service during 1935 of a requirement for what was termed an "advanced fighter". Kawasaki, Mitsubishi and Nakajima were each asked to produce prototypes of a fighter surpassing the performance of the Ki-18. Whereas both Kawasaki and Nakajima produced fighters of entirely new design to meet the requirement (as the Ki-28 and Ki-27 respectively), Mitsubishi, preoccupied with refining the Ka-14 for series production for the Navy, lacked sufficient design capacity to develop yet a further fighter. The Ki-18, with comparatively minor changes, was therefore resubmitted. As the Ki-33, the modified fighter was powered by a Nakajima Ha-l-Ko engine rated at 745hp at 3700m and enclosed by a broader-chord cowling. An aft-sliding part-canopy was added, the aft fuselage decking was raised and the vertical tail surfaces were modified. Completed during the early summer of 1936, the Ki-33 was submitted to comparative trials with the Ki-27 and Ki-28 from November 1936 until the spring of 1937. It was found to offer marginally superior max speeds between 2500m and 3500m over the 167kg lighter Ki-27, but the Ki-33 revealed an inferior turn rate and climb to those of the Nakajima contender which was selected for series production.

3-View 
Mitsubishi Ki-33A three-view drawing (1280 x 824)


Specification 
 WEIGHTS
    Take-off weight1462 kg3223 lb
    Empty weight1132 kg2496 lb
 DIMENSIONS
    Wingspan11.00 m36 ft 1 in
    Length7.54 m25 ft 9 in
    Height3.19 m10 ft 6 in
    Wing area17.80 m2191.60 sq ft
 PERFORMANCE
    Max. speed474 km/h295 mph

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