The Ki-102 Otsu

It is possible that tests was done against mild steel or other type of armor. Because even in documents Type 94 37mm field gun with higher muzzle velocity has lower penetration

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Ki-45 Otsu penetration increase:

Spoiler

Ho-203 and Ho-204 would have the same 720g Type 1 APHE, but with lower velocity.

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That’s because the gun was changed from a Type 94 to a Type 98

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It would be nice for them to have the same shell too.

Especially after the Ho-203 was nerfed (albeit historically)

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The stat card for the Ho-401 indicates that it can penetrate 28 mm of armor at a distance of 10 m. However, during a test flight on the Dev server, it was verified that it can penetrate 30 mm of armor from a distance of about 250 m. This is likely because the speed of the aircraft is being added to the muzzle velocity of the projectile in the simulation.

Diving the Ki-102 Otsu and flying level at treetop height at a speed of about 700 km/h (200 m/s), a 57 mm practice shell penetrated the 30 mm front hull armor of a Pz. III E from a distance of about 250 m. The fragments knocked out three crew members. However, it is true that the armor penetration capability of the practice shells for the Ho-401 is inferior. Ricochets and failure to cause damage often occur.

Spoiler


The claim that the Ho-204, with a muzzle velocity of about 500-600 m/s, can penetrate 45 mm of armor at a distance of 500 m might also be calculating the armor penetration capability by adding the speed of the aircraft to the muzzle velocity.

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Probably. I don’t really see much point in using 37mm AP rounds against aircraft, since the destructive power of a 37mm HEI is just so much higher than what an AP round can accomplish with a random hit.
So I would assume that the AP round was meant against armored ground and naval targets.

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At least we have practice shells lol

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Here is the Ki-102 handling manual:

Translation No. 80, 18 July 1945, KI-102 handling instructions. Report No. 3-d(65), USSBS Index Section 6 (文書名:Records of the U.S. Strategic Bombing Survey ; Entry 46, Security-Classified Intelligence Library. 1932-1947. 65 ft = 米国戦略爆撃調査団文書 ; 各種日本関係情報) (課係名等:Intelligence Branch ; Library and Target Data Division) (シリーズ名:CINCPAC-CINCPOA: Special Translations) - 国立国会図書館デジタルコレクション

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Too bad it’s missing 9 Pages. Book 3 is not included about the bombs and guns.
But in the beginning it says that the Otsu carried either 1x500kg, 1x250kg, 2x100kg or 4x50kg bombs.

The HEF shell specification for Ho-401 has been fixed based on the bug report you submitted, but oddly enough it is not mentioned in the patch notes and the bug report comments have not been updated. The pilots of the Ki-102 Otsu would have welcomed a buff to the HEF shell more than the addition of practice shells.


https://community.gaijin.net/issues/p/warthunder/i/3IftSUGSlcRh

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That’s quite good, I wasn’t aware of the HE buff until you pointed it out.

Now that we have the practice shell, it’s time for bombs! :D

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And a completely new damage model. That plane gets annihilated by 7.7mms…

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Was that mentioned in the patch notes, that it now shows the armor penetration by ‘explosive action’ in the stat card? Which is a pretty nice addition in general.

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I believe some of the armor is missing, but I would have to double-check to be sure

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Even if it had no armour, there would be no explanation for it being so easily taken out.

I know it’s not exactly the same pylon, nor in the same position, but the addition of bombs to the Ki-45 gives me hope.


Ki-102 Otsu



Source: Don’t let 1.87 and Rank VII distract you from the fact that Japan’s only attacker(Ki-102) is missing its bombs, engine armour and auto-entinguishers, and is mislabeled as otsu instead of ko. : r/Warthunder

Also what’s interesting to me is that the pylons for the Ki-102 otsu bombs closely resemble the fuel tank pylons on the Ki-67, at least as shown in this model. Perhaps the Ki-67 really could carry bombs on the fuel pylons
image

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Mounting bombs in place of droptank only requires right size shacles. Almost always this was done, though Japan was exception due to their long range needs. Sometimes it might have been entirely possible with what they already had, but wasn’t recorded anywhere as it wasn’t used. One example are very late Zeros mounting 500kg with a droptank shackle.

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There was a plan for Ki 67 for wing-mounted pylons. That way, it would be able to carry 3x 500 kg, or 5x 250 kg bombs. I don’t think it was ever implemented, tho.

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Apparently it was done, but I haven’t seen any pictures

In September 1944, the Army requested Mitsubishi to modify the Ki-67 to allow the suspension of 250 kg or 500 kg bombs under its wings. The design and prototype of this external rack were carried out. The long-range variant of the Ki-67 was equipped with drop tanks on this external rack.

Spoiler

Underwing Suspension System
Initially, two 250 kg bombs will be equipped under the wings, and as soon as possible, two 500 kg bombs will be equipped.

翼下懸吊装置
翼下に取敢えず250kg爆弾2発を、なるべく早き時期に於て500kg爆弾2発を装備し得る如くす

“Ki-67” Aircraft Modification Items (Fourth Phase). September 26, 1944. Army Aviation Examination Department

I think it might be a good idea to add this experimental external rack to the Ki-67-I Otsu. In the game, there are very few differences between Ko and Otsu apart from the tail gun.

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