• Source: Type 5 75 mm tank gun

The 5.180.24.3/info/type" target="_blank">Type 5 75 mm tank gun was used as the main armament of the Imperial Japanese Army prototype 5.180.24.3/info/type" target="_blank">Type 4 Chi-To medium tank. It was one of the largest tank guns to be fitted on a World War II Japanese tank. Due to late war shortage-induced delays only two were ever mounted in a completed 5.180.24.3/info/type" target="_blank">Type 4 Chi-To, neither of which saw combat use. The tank gun was also used on the prototype 5.180.24.3/info/type" target="_blank">Type 5 Chi-Ri medium tank and prototype 5.180.24.3/info/type" target="_blank">Type 5 Na-To tank destroyer.




Design and testing



The 5.180.24.3/info/type" target="_blank">Type 5 75 mm tank gun was intended as the main armament of the 5.180.24.3/info/type" target="_blank">Type 4 Chi-To medium tank, a planned improvement over the Imperial Army's most powerful production tank, the 5.180.24.3/info/type" target="_blank">Type 3 Chi-Nu. The first prototype 5.180.24.3/info/type" target="_blank">Type 4 Chi-To was delivered in 1944. Though the most advanced and powerful Japanese tank to leave the drawing board, late war industrial and material shortages resulted in only two being completed.
The long-barreled 75 mm L/56.4 (4.23 m) tank gun was a variant of the Japanese 5.180.24.3/info/type" target="_blank">Type 4 75 mm AA gun, which went into production in 1943. The prototype was tested at the Osaka Army Arsenal and two guns were completed in July 1944. Modifications were made, including removing the semi-automatic loader and adding a balance weight by October 1944. Mounted in the large, hexagonal turret of the 5.180.24.3/info/type" target="_blank">Type 4 Chi-To, it was capable of being elevated between -6.5 to +20 degrees.
Testing of the tank gun was performed by the Japanese Army with a varying degree of results as to armour penetration ability depending on the test conditions, including the target armour plate. According to the "Outline of the Effectiveness of Existing Anti-Tank Weapons and Materials" of the Imperial Guards 3rd Division, which is a document in the collection of the War History Instructor's Office of the Ground Self-Defense Force Officer College, the armor-piercing shells of the 75 TA (the military code for the 75 mm anti-tank gun) have a range of 1000 m with penetrating steel plate thickness of 100 mm. However, the exact 5.180.24.3/info/type" target="_blank">type of steel plate was not described. Subsequently, 9 March 1945, a shooting test was conducted at the Fuji Susono Training Area. During the test, 22 prototype 5.180.24.3/info/type" target="_blank">Type 4 high-explosive shells and two 5.180.24.3/info/type" target="_blank">Type 3 anti-aircraft shells were fired, before the firing system malfunctioned. From 17 to 19 March, a cast turret equipped with a prototype 5.180.24.3/info/type" target="_blank">Type 5 75 mm tank gun (long) II was mounted on a prototype vehicle and a firing test was conducted at the Irago Range. The results of testing 72 5.180.24.3/info/type" target="_blank">Type 1 armor-piercing shells and 68 5.180.24.3/info/type" target="_blank">Type 4 high-explosive shells were favorable. The muzzle velocity was 821 m/s (5.180.24.3/info/type" target="_blank">Type 1 armor-piercing bullet) to 819 m/s (5.180.24.3/info/type" target="_blank">Type 4 armor-piercing bullet). The General Staff and the Inspector General of Education concluded, "Although it can penetrate the front of the M4 tank at 1000 m, the probability is small due to the angle of impact, and it is often necessary to attack the side and rear."




Use


Intended 5.180.24.3/info/type" target="_blank">Type 4 Chi-To production was 25 tanks per month spread over two Mitsubishi Heavy Industries factories. Late war shortage-induced delays resulted in only 6 chassis being built by 1945 and just two tanks were known to be completed. Neither of the completed tanks were used in combat prior to the end of the war in the Pacific.

The 5.180.24.3/info/type" target="_blank">Type 5 75 mm tank gun was mounted into a prototype 5.180.24.3/info/type" target="_blank">Type 5 Chi-Ri medium tank as its main gun. The 5.180.24.3/info/type" target="_blank">Type 5 Chi-Ri used a lengthened version of the 5.180.24.3/info/type" target="_blank">Type 4 Chi-To chassis and had thicker sloped welded armor. With the end of the Pacific War, an incomplete 5.180.24.3/info/type" target="_blank">Type 5 prototype was seized by American forces during the occupation of Japan.
The prototype 5.180.24.3/info/type" target="_blank">Type 5 Na-To tank destroyer also used the 5.180.24.3/info/type" target="_blank">Type 5 75 mm tank gun as its main armament. Only two 5.180.24.3/info/type" target="_blank">Type 5 Na-To units were completed by the surrender of Japan. Neither were used in combat.




Notes






References


Hara, Tomio (1972). Japanese Medium Tanks. AFV Weapons Profiles No. 49. Profile Publications Limited.
Taki's Imperial Japanese Army Page - Akira Takizawa
Tomczyk, Andrzej (2005). Japanese Armor Vol. 4. AJ Press. ISBN 978-8372371676.
Tomczyk, Andrzej (2007). Japanese Armor Vol. 5. AJ Press. ISBN 978-8372371799.
Zaloga, Steven J. (2007). Japanese Tanks 1939–45. Osprey. ISBN 978-1-8460-3091-8.

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