Comments by "Sar Jim" (@sarjim4381) on "HMS Dido - Guide 129" video.
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I'm not sure the Didio class was equal to the Atlanta class for some antiaircraft roles. It wasn't until the Bellona subclass that the 5.25" turrest finally remote power control (RPC) and the High Angle Control System (HACS) Mark VI combined with the type 275 radar with blind fire capability that the 5.25" gun was able to achieve the role that it did best the Atlanta's, that of firing at very high altitude aircraft. The RPC reduced the turret crew from 12 to 10, allowing more room in a cramped turret. Combined to the maximum AA ceiling of over 40,000 feet compared to the 5"/38 of about 37,000 feet, and having a higher bursting chage and weight of explosives, and an increased one minute 10 RPM, the HMS Black Prince was able to hit Japanese bombers flying at 36,000 feet and drive off Japanese snoopers flying at 40,000 feet while she was off Okinawa. This was a major shock to the Japanese, who had been able to fly safely at high altitude, out of range of the 5"38 guns.
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