Type 2 No.6 21-Go Model 1 (IJN)

This munition was the UN’s version of the Та. It was a heavier bomblet and weighed 1kg (2.2 lb). A canister would carry up to 40 of the Model 1 bomblets. Like the Та, a fuse would open the canister deploying the bomblets onto their target.

Type 2 No.6 21-Go Model 2 (IJN)

This was the same bomblet but instead of the hollow-charge in the Model 1, the Model 2 used a solid black powder charge. This change was made because the IJN felt that an armour piercing charge was not necessary against aircraft that were typically unar­moured. This did, however, raise the weight of the Model 2 and a canister could only hold 36 of the bomblets, the total weight of the loaded canister being 49kg (108 lb).

Type 3 No.6 Mk.3 Model 1 (IJN)

This was basically a simplified Type 99 No.3 Mk.3 bomb as it used a wooden nose and did away with the impact fuse. The bomb was 1 m (3.3ft) long and weighed 56kg (1241b). Its design commenced in 1943 and entered ser­vice in 1944. Colouration was the same as the Type 99.

Type 3 No.6 Mk.27 Model 1 (IJN)

Development of this anti-bomber rocket bomb began in January 1944. The cone – shaped nose contained 140 iron pellets embedded in 4kg (8.8 lb) of white phospho­rous. A 10kg (221b) propellant charge moved the bomb to a velocity of 270m/sec (885.8ft/sec). On detonation the pellets were scattered in a 60° radius and the bomb was provided with the fittings for rail launch­ing by fighters. The IJN accepted it for service in February 1945 and final testing was completed in April 1945. Testing was con­ducted by Dai-Ichi Kaigun Koku Gijutsu-sho, the Second Powder Factory Arsenal, and Kashima Bombing Experimental Field. The bomb was 1.4m (4.6ft) long and weighed 60kg (132 lb).

Type 3 No.6 Mk.28 Model 1 (IJN)

Using the Mk.19 as a basis, the Mk.28 was a small, anti-bomber rocket bomb with a.6kg (1.31b) explosive warhead A 2kg (4.41b) pro­pellant charge moved the bomb to a maxi­mum velocity of l,312ft/sec. Dai-Ichi Kaigun Koku Gijutsu-sho built the bomb and its clearence testing was undertaken by Dai-Ichi Kaigun Кбкй Gijutsu-sho, the Second Powder Factory Arsenal, and Kashima Bombing Experimental Field. Testing was completed late in 1944 but the rocket bomb was not accepted for service. Its length was .7m (2.3ft) and weight 7.3kg (161b).

Type 5 No.25 Mk.29 (IJN)

Designed for use by special attacker aircraft, the Mk.29 contained 1,100 pellets packed in 50kg (1101b) of white phosphorous. After fly­ing into a bomber formation, the pilot would use a pull cord to detonate the bomb while it was still attached to the aircraft. The bomb could also be released where the tail fuse would trigger the bomb explosion. Unlike other pellet dispersing munitions, the Mk.29 flung them at right angles to the bomb casing instead of in a downward cone. Initial testing was begun in 1944 but only one prototype was air dropped and the type did not enter service. The Mk.29 was 1.6m (5.1 ft) long and weighed 250kg (551 lb).