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

Only the practice shells offer any kind of penetration of 20 mm up to 500 m, but they lack the post-penetration damage to be used for ground attack. It is best advised to use a full tracer belt as the HEF-T offers the most explosive mass and is a single shell-type belt.

When flying on a newer-type air map, AI ground targets that have detailed vehicle models have reduced armour and can be killed with HE, allowing the pilot to take the full HEF-T belt without wasting any precious ammo count on Practice shells.

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

Penetration statistics
Belt	Penetration @ 0° Angle of Attack (mm)
	10 m	100 m	500 m	1,000 m	1,500 m	2,000 m
Default	23	22	19	14	7	3
Universal	23	22	19	14	7	3
Ground targets	23	22	19	14	7	3
Tracers	3	3	3	3	3	3
Stealth	23	22	19	14	7	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-T	920	0.33	0.5	0.1	59.5	79°	80°	81°
HEF-I	710	0.35	0.5	0.3	35	79°	80°	81°
HEF	710	0.35	1.1	0.8	35	79°	80°	81°
P	920	0.33	N/A	N/A	N/A	47°	56°	65°
PT	920	0.33	N/A	N/A	N/A	47°	56°	65°

Comparison with analogues

Give a comparative description of cannons/machine guns that have firepower equal to this weapon.

Usage in battles

Describe the cannon/machine gun in the game - its distinctive features, tactics of usage against notable opponents. Please don't write a "guide" - do not impose a single point of view, but give the reader food for thought.

Pros and cons

Summarise and briefly evaluate the weaponry in terms of its characteristics and combat effectiveness. Mark pros and cons as a list.

Pros:

• tracer-Belt is HEF-T only (fast bullets with 59g explosives)

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

Excellent additions to the article would be video guides, screenshots from the game, and photos.

See also

Links to the articles on the War Thunder Wiki that you think will be useful for the reader, for example:

• 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;
• encyclopedia page on the weapon;
• other literature.