In February 1938, the Japanese Navy purchased 20 Seversky 2PA-B3 two-seat fighters.
$1,573,469.06
They were serviced in the Navy, designated A8V1 and saw a little operational use against China.
The photo is of the plane 'Shiokaze-Gō' sold to the newspaper company Asahi Shimbun.
On September 24, 1937, Mitsubishi purchased the manufacturing license for the North American NA-16-4 trainer and 1 NA-16-4R (NA-37) fitted with Wasp Junior engine.
License $35,000.00
Plane & Instruments $84,108.65
The photo is the NA-16-4R that was delivered to Mitsubishi.
On December 31, 1937, the Japanese Navy purchased 1 North American NA-16-4RW (NA-47) trainer fitted with Whirlwind engine.
$44,785.40
Eventually Watanabe (later Kyūshū) developed the K10W1 intermediate trainer referencing NA-16-4.
The photo is of K10W1.
On May 6, 1937, the Japanese Navy purchased 1 Fairchild 91B Jungle Clipper (A-942-B) amphibious transport plane fitted with Cyclone engine.
$80,530.00
It was evaluated by the Navy with the experimental designation LXF1, but wrecked in a landing accident.
On June 26, 1937, the Japanese Navy purchased 1 Canadian Car & Foundry G-23 Goblin two-seat carrier fighter fitted with Cyclone engine.
$43,750.00
A Canadian-produced variant of the US Grumman FF.
The Japanese Navy evaluated it as the AXG1.
The photo is of an RCAF Goblin.
On July 17, 1937, the Japanese Army purchased 1 Ranger V-770 engine.
$6,268.33
This was an air-cooled, 12-cylinder, inverted-V aircraft engine.
On February 9, 1939, the Japanese Army purchased 1 Kellett KD-1A autogyro.
$27,452.70
When damaged during Army trials, it was repaired by Kayaba. The results were good, so the domestic model 'Ka-Gō' was produced and serviced.
The photo is of YG-1B, a US Army model of KD-1A.
On July 7, 1937, the Japanese Army purchased the manufacturing license and 1 Vought V-143 fighter fitted with Twin Wasp Junior engine, plus 1 spare engine.
Plane & Spare Engine $105,000.00
Not credited for high performance, the structure was studied. Also inspected by the Navy.
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There is a well known incident in which a rogue 'I-Gō' missile hit a ryokan women's bath room in the city of Atami during testing. Four women were killed or injured, two staff and two bathers.
Because of this it acquired the nickname 'ero-bomb' -- 'perverted bomb'.
Kō, pictured above, remained experimental with few units. 800kg warhead
Otsu, a smaller missile, is the subject of the quoted post. 300kg warhead
According to the majority of sources, this ero-bomb incident was caused by an Otsu...
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Contrarily, Senshi Sousho 87 records that it was a Kō.
I can't definitely conclude which variant actually caused the accident, but it is compelling to think that it was maybe the Kō.
(However, as a prototype missile, it's very possible that either variant could malfunction.)
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