Naval Historywith Dr. Alex

Q&A · 1:39:28-1:45:32

Japan's long-range flying boats in the ASW role

Japanese flying boats offered long visual patrols and repeated attacks, but their overall standing against Allied radar-equipped aircraft is disputed.

Anti-Submarine WarfareImperial Japanese NavyKawanishi H6K MavisKawanishi H8K EmilyMaritime Patrol Aircraft
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Question

How far behind British and American ASW aircraft was the Imperial Japanese Navy?

Short answer

Japan lacked some advanced Allied sensors, but its H6K and H8K flying boats provided strong range and endurance for visual open-ocean patrols and depth-charge attacks.

Notes

H6K and H8K flying boats combined long endurance with the ability to carry several depth charges, allowing them to search offshore and remain over a diving contact. Early-war aerial ASW depended heavily on visual detection, so visibility, numbers of aircraft, and time on station mattered. Japan also used the B6N and older tactical aircraft where they were available, with the large flying boats suited to open-ocean work. Allied radar and the Leigh Light become the grounds for arguing that Japanese ASW aircraft still lagged behind later in the war. The opposing view emphasizes Japanese endurance and the different Pacific operating environment. Their overall ranking remains disputed.