Me too, from what you have provided, Shinpachi! I have copied what you've provided for my own purposes, it adds so much to my knowledge that I didn't know before, so thank you so much for posting that information.
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I think I have got wiser now
I would love to have seen a zep.My grandfather once told me his good memory that he climbed on the roof to see the Zeppelin flew toward Kasumigaura along the Pacific coast. My father was 4-year old then and remembered nothing.
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Source: 全長「235m」土浦に現れた巨大飛行船「ツェッペリン伯号」 - withnews（ウィズニュース）
HiTesting a Ki-21 with its 2nd experimental airframe at Shijiazhuang, China in 1938.
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Testing German fighters at the IJA evaluation division in 1943.
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Source: IJA Air Corps Photo Album (1961)
IJA test pilots confirmed like this -
Many thanks!IJA test pilots confirmed like this -
Fw-190's turning characteristic was not good but this fighter flew not only very fast but showed good stability. It was quicker to climb and dive because of its excellent acceleration ability than any other competitors in Japan at the time. But, in a simulated air combat with Ki-61 and Ki-84, when a pilot tried a sharp turn, unknown vibrations occurred and sudden stall followed. Fw-190 should avoid turn in air combat to win. Fw-190 was also easy for maintenance with no oil leaks and mechanical troubles. In August 1945, just before the end of war, a speed race was held with five aircraft of Fw-190, Bf-109(*other source says Ki-61), captured P-51, P-40 and Ki-84 at the altitude 6,000 meters. Just after the start, Fw-190 and Bf-109 took the lead but one minute later P-51 caught up and three minutes later, P-51 had taken the lead. Winner was P-51. Fw-190 and Ki-84 were 2nd. Bf-109 was 3rd and P-40 was the last.
Fw-190's aerodynamic design around the engine was later adopted by Ki-100 when it was converted from Ki-61.
Bf-109 was thought unnecessary for the Japanese because Ki-44 was confirmed superior in simulation.
Reference site: フォッケウルフ Fw190 - Wikipedia