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In September 1943, the Allies were able to rebuild a complete fighter out of several wrecked Model 2A
Hayabusas found at Lae, New Guinea. This aircraft was flown in mock combat against several different
Allied fighters. Allied pilots commented favorably on the Hayabusa's sensitive controls and extreme
maneuverability. It had no vicious flight characteristics, and its turning and stall characteristics were
better than those of any Allied fighter. It handled well in the air, and had phenomenal low-speed handling
capabilities which were aided by its set of combat flaps. It had excellent low-speed acceleration and
could leap from 150 mph to 250 mph with extreme rapidity. Nevertheless, the Allied pilots felt that the
Ki-43 was outclassed by the P-47 Thunderbolt, the P-38 Lightning, the Supermarine Spitfire, and even
by later models of the P-40 Warhawk. The Hayabusa was appreciably slower than most Allied fighters
and could usually be evaded by diving. The Hayabusa lacked effective firepower and its lack of effective
armor protection made it vulnerable to superficial combat damage and often disintegrated in the air when
hit. Nevertheless, Allied fighter pilots were always well-advised to avoid combat with the Hayabusa at
low speeds since its rapid acceleration and excellent low-speed maneuverability made it a deadly opponent
in such situations.
https://www.warbirdforum.com/hayabusa.htm

43年9月にラエで鹵獲した隼2型を試験したけど、時速150マイルから250マイルへの加速が良い、と。
P-40の後期型やP-38やP-47よりいいと。
最高速度は遅いしダイブすれば逃げられるし、武装も装甲も貧弱だけど、低速だからと突っかかるのはやめとけと。