Ho-155 (30 mm)

Description

Write an introduction to the article in 2-3 small paragraphs. Briefly tell us about the history of the development and combat using the weaponry and also about its features. Compile a list of air, ground, or naval vehicles that feature this weapon system in the game.

Vehicles equipped with this weapon

• Ki-83
• Ki-84 hei
• Ki-87
• Ki-94-II
• Ki-200

General info

Tell us about the tactical and technical characteristics of the cannon or machine gun.

Available ammunition

• Default: HEF · AP-T · HEF-I
• Universal: HEF-I · AP-T · AP-T · HEF · HEF
• Ground targets: HEF-I · AP-T · AP-T · AP-T · AP-T
• Tracers: AP-T
• Stealth: HEF

Penetration statistics
Ammunition	Penetration @ 0° Angle of Attack (mm)
	10 m	100 m	500 m	1,000 m	1,500 m	2,000 m
HEF-I	3	3	3	3	3	3
AP-T	28	26	18	11	7	5
HEF	3	3	3	3	3	3

Shell details
Ammunition	Velocity (m/s)	Projectile mass (kg)	Fuse delay (m)	Fuse sensitivity (mm)	Explosive mass (TNT equivalent) (g)	Ricochet
						0%	50%	100%
HEF-I	700	0.24	0.2	0.3	27.5	79°	80°	81°
AP-T	700	0.24	-	-	-	47°	60°	65°
HEF	700	0.24	0.2	0.8	47.19	79°	80°	81°

Comparison with analogues

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Usage in battles

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Pros and cons

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Pros:

Cons:

History

By early 1942, the Imperial Japanese Army Air Service recognized that their newly introduced Ki-43 fighter aircraft lacked the firepower needed to engage enemy aircraft with only two Ho-103 (12.7 mm) machine guns to use. Nakajima's replacement design, the Ki-84 ko increased the firepower by supplementing the Ho-103 with 2 Ho-5 (20 mm) cannons. However, the same year, the Third Army Aerotechnical Laboratory at Tachikawa, under the leadership of Chuo Kogyo K. K., developed a 25x155 mm variant of the Ho-5 to replace it. Designated the Ho-51, this gun was intended to fit in the same mounts of the Ho-5 it was intended to replace, but in early 1943, the decision was made to scale the design up to fire a 30x115 mm shell that held 2.25 times the explosive power of a Ho-5 shell. Unusually for a recoil-operation design, the Ho-155 prototype had both the "ice cream cone" muzzle break of the Ho-5 and a forward extension to support the heavier barrel, while still keeping the same receiver as the Ho-51. However, the weight and reliability issues from the recycled receiver made it a undesirable replacement for the Ho-5, so the Nagoya Army Arsenal went to work making the gun a feasible replacement. From 1943-1944, Nagoya made the Ho-155-I prototype which could successfully handle the 30 mm cartridge but was once again too large for aircraft. By 1945, they had their second prototype, the Ho-155-II which was capable of fitting into the wing bays of the Ki-84 and was tested. The Ho-155 was also planned for the Ki-102 otsu and the Ki-201 fighter jet, the latter of which never left the drawing board. Whether the Ho-155 ever saw service is unknown, but it is unlikely given the state of Japanese industry thanks to the Allies' strategic bombing campaign.

Media

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See also

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• reference to the article about the variant of the cannon/machine gun;
• references to approximate analogues by other nations and research trees.

External links

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• topic on the official game forum;
• other literature.