|Seaplane and Flying boat|
Desperate War of Japan in the Pacific|
This page contains kanji.
IJN used seaplanes and flying boats for search of enemy ships and parol in the Pacific War. USN used flying boats for rescue pilots, search enemy ships and patrol.
A Jake of Aichi ejected from IJN heavy cruiser Tone, which informed weather of Pearl Habor before air raid.
2 seaplanes flew to Hawaii and bombarded. The 2 seaplane, Emiliy was refueled from 3 submarines at French Frigate Shoals.
5 flying boats took off Tulagi on 6th May 1942. One of them spotted TF17 at 0830 but the telegram did not transimt KB. A seaplane flew from the Deboyne Lagoon spotted an enemy oiler but mistook it an aircraft carrier. IJN seaplane tender, Kamikawa-maru supported the search by seaplanes. IJN seaplane tenders had workshops for forging, welding and casting. So they could repair seaplanes and were mini bases for seaplanes. Soon seaplane tenders were not operational because seaplanes could not endure air combats.
Gunzo, p16-19 No.65
Flying boat tender, USS Tangier supported 12 PBYs in the Coral Sea Battle.
Gunzo, p40 No.46
Heavy cruiser Tone and Chikuma ejected 2 Jakes each, and battle cruiser Haruna also ejected a Type 95 (sea biplane). No.1 Jake of Chikuma flew over the cloud. It was nonsense because IJN seaplanes were not equipped with an airborne radar. No.4 Jake of Tone took off 30min delayed. No.4 had a chart which showed a wrong position of Midway Island.
USN Midway base took off 22 PBYs at 3am on 4th Jun. One of them spotted a transport convoy. 4 PBY took off at 9:15pm and torpedoed and hit a freighter, Kiyozumi-maru at 3am. All of 4 were equipped with an airborne radar. 11 PBY flew to search KB and one of them spotted the KB at 5:30am on 5th Jun.
Chihaya, ge p161-162, p166, p171-172
The 958th Kokutai used seaplanes for sweeping PT and submarines.
PBY always made contacts at night, when IJN destroyers ran slot.
IJN battleship Yamato flew an observe sea plane twice in the battle of Leyte. They found other aircraft carriers groups in the south. An flying boat with an airborne radar had found 4 groups of enemy ships at night 0200 before the combat. But the information was reported at 1700. It was too late.Ebina p.312
IJN mistook commnunication as well as USN did in Solomons. Main heavy cruisers fleet had no seaplanes, because GF(Grand Fleet) ordered to send all of them to land base.
The seaplane base move to Chimu Wan. VPBs of the PBMs moved from Kerama near Gushikawa in Jul. The forces was TG50-5
(SEARCH & RECONNAISSANCE GROUP) which had 6 seaplane tenders and 3 destoryers. The seaplane tenders were USS
Hamlin(AV-15), St. Geroge(AV-16), Chandeleur (AV-10) and etc.
PB2M or PB4Y began to flow in the west of Kyushu. These attacked ferries or fishery boats. The sea traffic stopped at the moment. So Sasebo of IJN requested 343rd Koukutai to intercept them. The Kokutai assigned 8 Georges to control the sky till the end of June 1945. Genda p.349
USN developed 46m long of new H-4B hydraulic catapult which could accerate 13t of aircraft at 145km/h(40.2m/s). The catapult worked at 1 rpm. This was not in time the first Essex till Dec 1942. The catapult pulled a F4U loading VAR rockets, 1,000lb bomb and additional fuel tank in the end of the Pacific War. The total weight of the F4U was 3 times of a Zero loading empty!
Gunzo p85, No76
USN had developed hydraulic catapults for years. USN applied them for escort aircraft carriers which ran at max speed 18-20kt, could launch a TBF weighing 8.2 ton at WWII. A site shows beautiful photos of ejecting sea biplanes from USS Colorado etc.
Kimata, p221, p226, p236, p241
96-siki kogata suijyou teisatsuki(E9W1)
I-7 gata sensuikan
|Submarine and seaboat|
Spy Pearl Habor|
The War College of IJN had studied air bombardment at Pearl Harbor in 1936, though most of Japanese people believe Yamamoto thought of the idea at first. Reconnaissance was absolutely imperative for IJN. IJN decided to apply submarines and seaplanes for reconnaissance. IJN was to deploy the 6th fleet, submarines at Kwajalein (8.7N, 167.7E), when Japan at the Pacific War. The distance was 3,944km between Kwajalein and Honolulu (21.3N, 157.9W).
|Bombardment of Pearl Harbor ( Operation K )|
4th1300 flew over French Frigate Shoals
4th1350 took water
4th1600 took off French Frigate Shoals to Hawaii
4th1657 passed Necker Is
4th1825 passed Niihau Is
4th1844 Radar of Kauai Is spotted them
4th1918 US alert, PBY and P-40 took off
4th1935 passed Kauai Is(22N, 159.5W)
4th2100 offshore Oahu Is
4th2110 No1 Emily released four 250kg bombs
4th2130 No2 Emily released four 250kg bombs
5th0910 No2 returend Wotje Atoll
5th0920 No1 returend Jaluit Atoll
2 Emily released bombs after 7 hours at sunset. Emily No.1 flew 3,896km for 12h10min. Emily No.2 flew 3,678km for 11h40min. The cruising speed was 320 and 315km/h each.
Gunzo, p20-23, No57
HIJMS Submarine I-351: Tabular Record of Movement
I-366 transported food for soldirs at Pagan Island. I-366 departed from Yokosuka on December 3rd 1944 and stayed at the
Tateyama Bay for a few hours till midnight. I-356 ran submerged at 2kt for 20h a day near Saipan 600nm. I-366 arrived
at Pagan Island came back on 28 December. I-366 departed for Truk on January 30th 1944 to ferry aircraft parts. I-366
arrived at Truk on February 12. I-366 departed for Woleai Atoll(Mereyon) to ferry food. I-366 came back on 3 March, 1945.|
|Submarines carried seaplane|
1942May10 Durban Habor of South Africa
1942May30 Diego Suarez Habor of Madagascar
1942May-- Port Elizabeth of South Africa
I-10, Igo 10
1942Jan05 Pearl Harbor
1942May29 Dutch Harbor
I-25 spied ports in the south Pacific as follows in 1942,
1943Oct17 Pearl Harbor
 French Frigate Shoals Airport (23.86, -166.28)
 Jaluit Atoll (6.00, 169.57)
 Wotje Atoll(9.44, 170.02)
 K sakusen
 Indispensable Reefs(-12.67, 160.42)
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