Desperate War of Japan in the Pacific
My mother told me her memory that a B-29 flew over her home land, Hokkaido in summer 1945. It tailed a stream. Old Japanese pople remember B29 all over Japan. Newspapers wrote disasters of two nukes in Hiroshima and Nagasaki at once, though war press anouncement was not true at all. The US had to keep bombing by B-29s because they were productioned by a lot of US people's tax. FDR would be in trouble, if Japan surrendered at once after German surrender. Japanese leaders also wanted to continue the desperate war.

Source 1 : Super fortress B-29
US Army decided to pay $85,652 for preapring a trial on 14 June 1940. USAAF decided to pay $3,600,000 for 2 trials on 29 August 1940. After checking a mockup, USAAF ordered 14 YB-29 and 250 B-29 on 19 May 1941. The first roll out was on 15 April 1943.

XB-29 made first flight on 21 September 1942. It had 22 fuel tanks with wing[6]. Ratio of weight to wing area was 10 times of light plane cub. Boeing began a test flight of YB-29 on 26 June 1943.

Source 2 : B-29, p11-14
FDR requested $300,000,000 for aircraft on 4 January 1939. US Congress approved purchase for 3,300 aircraft on 3 April 1939.

    1941Jun16 order 14 YB-29 $1,403,623.86 AC19673
    1941Sep06 order 250 B-29 $3,000,000,000 AC19673-1
    1942Jan13 order 500 B-29 $5,300,000,000 AC19673-2
    1942Sep19 total order 1,644 B-29
    1944Mar-- production 100/month
    1944Jul-- production 4/day
    1946Jun10 last roll-out of 3,955th B-29
 F-13 for photo reconnaissance
Tokyo Rose
F-13 was modified B-29 for photo reconnaissance. It was equipped with 3 Fairchild K-17/-17B, K-18 and 2 K-22 cameras in a front bomb bay. And 2 640gal fuel tanks in a back bomb bay. The total amount of fuel was 8,080gal(25.8kL). The amount is equivalent to 129 drum cans of Japan standard.
Boeing B-29, p33

21st AF used a F-13 to take photos over Tokyo on Oct 13th 1944. LeMay writes that Japan will not intercept a single super fortress to keep forces against large scale raids. The F-13 took several thousand photos for 35 minutes over Tokyo. The F-13 was called Tokyo Rose.
B-29, p166
Remark : Translator of B-29, Watanabe points the right date, 1st Nov

The Tokyo Rose invaded Tokyo at 9,800m altitude on a very clear day, Nov 1st 1944. Its height reached at 11,000m returning course.
Watanabe, p232

The nose art of Tokyo Rose was a woman of hair style like an onion who sweeps floor with a mop. She was not attractive like other painted women in B-29s. By the way I can imagine that a lot of people saw the exhausted stream. My mother told me that she saw streams of B-29 in summer in Hokkaido.

As matter of fact, Japan misjudged invading more than 3 aircraft from information on Nov 1st 1944. So Dinahs intercepted at full length. Tonys and Nicks of 18th, 144th, 53rd sentai did. Kitagawa says, 'I flew 11,400m high, but B-29 was flying over the altitude.'
Watanabe, p234

Precision bombardment
B-29s flew from Saipan and Guam to Japan mainland. Its flight took 13 or 14 hours. 94 B-29s flew Tokyo bombardment on 24 November for the first time. The first took off at 6:15 am. USAAF tried to destroy aircraft factories. A famous target, Nakajima's Musashino factory in the west of Tokyo which was called target #357. Though 20th AF bombered sevral times the target and B-29s could not destroy it, but Nakajima was forced to escape the factory and the production of Nakajima was very lowered. The factory stopped production on 30 April 1945. While B-29 bomed at #357 13 times. Only 10% of all the released bombs dropped within the area of the factory. 2% of them hit the buildings of target. USAAF lost 40 B-29s and 440 crews during the operation. The bombs killed 220 workers and hurted 266. The kill ratio was extremely bad for USAAF. It was natural US tax payers wanted much more kill ratio, considering US war history. How did Japan intercept B-29s on that day? A Ki-46 flew via Iwojima and photoreconed I Airfield of Saipan and North Airfield of Tinian on 6 November. On 9 November, A C6N photoreconed Guam.

    10:30 IJN Irving and Judy patrol
    11:00 IJA Ogasawara post sighted a lot of B-29s
    11:05 IJN patrol boat sighted them
    11:10 IJA 15th SQ and 70th Sentai actioned
    11:30 IJA Full length action (53rd, 47th, 244th, 23rd, 70th etc)
    11:58 IJN Alert over Yokosuka
IJN actioned 109 sorties and lost a Zero and a Judy on 24 November. While IJA lost 6 aircraft[3]. Why didn't IJN cooperate to intercept B-29s?

P-51s train raids
Jun10TokyuYokohamaAll the passengersYokohama Kushu
Aug05ChuoYu-no-hana Tunnel52,
133 Wounded
I-no-hana Tunnel,
Sagamihara rekishi
Aug08NishitetsuTukushi Station64, 100 wounded
at least
Tukushi Station
P-51 began to arrive at Iwojima on 7 March 1945. P-51 flew over Japan main land with B-29 from Iwojima for the first time on 7 April 1945. 153 B-29s with P-51 released bombs on Mitsubishi Aircraft Engine Factory from medium altitude at daytime and destroyed 60 % of it on 7 April. After all, IJN and IJA lost 9 and 11 aircraft including 5 night fighters, while only 2 of 108 P-51 were lost. Night fighters could not intercept B-29s at daytime because Japanese radars had no ablity to distiguish B-29 with P-51.

Only P-51 invaded on 19 April. Only P-51 flew 730 sorties for 9 times from 26 April to 13 June. They loaded a drop fuel tank of 625L. 26 P-51s were lost.[9] P-51s raided trains. The table shows a few cases.

 Kawasaki Aircraft was destroyed
21BC raided Kagagimihara where Kawasaki Aircraft and Mitsubishi were located at in June 1945. 34 B-29s destroyed Kawasaki Aircraft on 22 June 1945 by 1t bombs for 30 minutes. On 25th, 85 B-29s destroyed Kawasaki by 250 kg bombs completely for an hour and half[5]. They released bombs at daytime from medium altitude. Kawasaki was a maker of Ki-45 kai and Ki-102 which are for night fighters. Kawasaki also made reliable fighter Ki-100.

Escalation of tactics
Range of US Army aircraft Oui p.372
3,250kmB-29 with 5.5t
1,500kmP-51 combat 30min
1,200kmB-24 with 2.8t
B-25 with 0.9t
P-38 combat 15min
800kmconventional single
engined fighter combat 30min
The table shows ranges of US army aircraft. B-29 had a range 3,250km with load of 5.5t, 5,070km with 9,070kg, 6,120km with 7,260kg. Oui's data is a radius range.
Watanabe, midasi
Superfortress B-29, p278
Todofuken-chou syozaichi

USN carriers aircraft burned engine assembly of the factory on 17th Feb 1945, though B-29 had tried 6 times already. While COA recommended targets of bombardment,

    Prime aircraft factories
    Fire bombs cities bombardment
    Mine release siege
    Kerr, p119

Japan tried to attack B-29s in airfields of Mariana 5 times. IJA and IJN aircraft destroyed 24 B-29s and damaged 43 on Xmas.
Superfortress, p.179-180

Although daily precision bombardment did not have much effect, Night raid of B-29s was very effective to destroy civilian life of Japan, because they could carry bombs heavier than usual. The civilians had always had to sleep wearing usual working clothes for fear of night raids. The table compares 2 ways of bombing. 6 big cities of Tokyo, Nagoya, Kobe, Osaka and Yokohama were burned by B-29 till 15 Jun 1945. Japanese students in cities knew Japanese military propaganda by their teachers, newspapers and radio. Government decided to labor students for a year on 18 March 1945[2]. All the students in Japan began laboring for food and military production on April 1945.
Kerr p.82-83
Watanabe p.58-59
Morimoto, p257

Increase of carrying bombs of B-29 at night
DateRelased bombsRelease height ftReturned timeTacticsTargetLoss ratio
44Nov245,000lb(2.27t)27,000-33,000 nightformationfactory8.3%
45Mar106.6t5,000-8,000 noonsinglehouses5.0%

Announced bombardment result
21AF began to release airborne leaflet propaganda to inform bombing on July 28th. I think it was a triumph over Japan's sky war. I calculated loss ratio from 1st Aug to 8th Aug as follows. Certainly B-29s released not ordinary bombs but fire bombs over all the listed cities. Population ranking of Japanese cities is nowdays. A B-29 burned about 70 houses, when it bomberded at a small city.
B-29, p.59
Dai Toua Sensou kaisi irai ippan Kusyu higai no gaikyou Nihon Hondo Kusyu
1945.8.2 4-shi kushu
B-29 loss and burned efficiency in case of announced bombardment
(latitude, meridian)
loss ratio
Aug1Hachioji(35.67, 139.32)241690.6%13,33878.9
Aug1Toyama(36.7, 137.22)411730.0%11,98669.2
Aug1Mito(36.4, 140.6)87160 0.0%10,10463.2
Aug5Nishinomiya31250 0.4%--
Aug5Maebashi6892 0.0%--
Aug8Fukuyama3691 0.0%10,179111.9

    1st Aug
    Toyama is on the coast of the Japan Sea. Hachiouji is the west of Tokyo. Mito is the north east of Tokyo and an IJA air base. Although the population of Mito was small, Mito seemed a depo of the coast positions.
    Toyama : 2,700 killed, 8,000 wounded
    Hachiouji : 500 killed, 2,000 wounded
    Mito : 300 killed, 1,293 wounded

    5th Aug
    Targets of Maebashi raid were a Riken factory, a Nakajima factory and IJA airfield. Nishinomiya raid was to burn the city.
    Maebashi Kusyu
    Hanshin Dai-kusyu

    8th Aug
    It seems targets of Fukuyama raid were a Nihon Kayaku factory, Mitsubishi aircraft factory, a Teikoku Senryou factory, 41st infantry regiment HQ, IJN Kokutai. 354 killed, 864 hurted, 10,179 burned houses, 47,326 people suffered damage(81% of Fukuyama City). Tokyo big raid burned 267,171 houses or buildings[7].
    Fukuyama Dai-kusyu

Sei-go operation
IJAAF stopped aircraft being in the end of Jun 1945. IJAAF decided to intercept B-29s at night. All the 10th, 11th, and 12th AW of working fighters were 250. Other sentai were, 30th FG(47th, 244th, 51st, 52nd sentai)
1st AF(1st, 11th sentai)
6h AF(101st, 103rd sentai)
20th FG(111th, 112th sentai)
Akeno, Hitachi
IJAAF had working about 450 fighters on July. the 1/3 of them seemed to be able to attack B-29s at night. But radars were preparing in local cities. Search lights were short. AI radars had not been practical yet. A night fighter could not counter single engine fighter naturally. So Japanese night fighters had to escape attacks of more than 100 P-51s from Iwojima almost everyday, and 300 to 1500 aircraft of USN attacked airfields at daytime. And worse telephones were not available among head quaters of air wings. I think it important the telephone network was incredibally poor in 1940s. Chihaya, an IJN officer had to wait 2 or 3 hours to call Tokyo office of IJN from Nagasaki office by phone in 1941. I think phone is a fatal bottle neck of IJN and IJA. After the Pacific War, GHQ was surprised at low quality of Japanese phone network. GHQ had to work to improve the network by themselves. Japanese phone network was poor because of simple electric part defects which were ceramic capacitors in amplifiers[1].
Chihaya p.78

If search lights were enough in big cities, pair of a radar and a search light could track a B-29 like UK method, though direction radars could not detect the flying height. For example, a pair of 2 IJA aircraft of 53rd sentai flew over Maebashi at 8pm with an radar information from Hachijyojima at 6pm. With a few search light, Nakagaki and Iimura pilot could not catch up a B-29. They returned Fujigaya at a loss for 20 minutes patrol. It was diffcult for them to fly 100km Maebashi and return at night. If IJA have well trained 2-seated night fighter like old Ki-45 with PPI radar enough, IJA could have shoot down a few of B-29s. And B-29s had to be equipped with machine guns againt IJA night fighters.

After all, Sei-go operation did not action. IJA explained aircraft being for Ketsu-go operation. Simply IJA could not intercept B-29s at night at all. Fukuyma burned 2 folds of efficiency compared with Mito. How easily did Fukuyama burn?

 IJA and IJN cooperative attack at Saipan airfield on Xmas
7th sentai of IJA was under command of IJN temporally. IJN planned to attack B-29s airfields of Saipan on Xmas 1944. Some Ki-67 fixed up a tank of 1kl of fuel. The 7th sentai and 762nd koukutai advanced to Iwojima on 25 Dec. 3 Ki-67 loaded 20 bombs of 30kg and 5 Frances took off alone about 5pm. Okada's ki-67 reached over Saipan at 7,900m high at 9:05pm. Okada saw waves around Saipan under the sky of the brightening moon. An arrived company had already released. Flak was correct. Okada dived 500km/h speed at 25 deg. Nishiki seated behind him saw passing through 2 night fighters at the right wing below. Okada's plane released bombs and his tail gunner saw burning fire on a runway. Okada listend to the last telegram of other k-67 attacked by a night fighter. He ran away zigzag at full speed. So he was anxious about present position because of disorder of receiver. Okada's plane could not receive guiding wave from Iwojima. But Navigator Aoki from IJN guessed correct and Okada flew Iwojima lightening the sky back. Getting on land, Nishiki saw a big hole of 30cm diameter in the bomb bay.
Watanabe p.269-271

 Olympic operation
B-29s burned all most of stragitic targets or cities till July 1945. USAAF judged it 50% of burened area. USAAF had 3,692 B-17 and 4,986 B-24 then. The 8th AF HQ moved from Belguim to Okinawa on 16th Jul. US Joint board approved Olympic operation on 25th May. 20AF was equipped with 1,056 B-29. I suppose Olympic operation would occur bigger disaster than Okinawa. Ironically Russian Blitz invasion in Manchuria erased possibillity to have damage in Kyushu.

 Airborne leaflet propaganda
Local cities to be air bombered by B-29
This leaflet tells, 'Cities of encircled names will be bombed soon.' Listed cities were Nagano (), Takaoka (), Kurume (v), Fukuyama (R), Toyama (xR), Maizuru (), Otsu (), Nishinomiya ({), Maebashi (O), Koriyama (SR), Hachioji (q) and Mito (). The outside wrote in bumbleheaded Japanese. I feel it strange further reality. A boy read another leaflet. it said, "Japan is a country of God. Japan will burn ash." The boy thought enemy spoke a joke that God (_) and paper () are the same pronunciation Kami in Japanese. Actually B-29s bombed such cities, Nishinomiya, Toyama, Fukuyama, Hachiouji, Maebasi and Mito on Aug 1945. B-29 flew from the south. So Koriyama is far from the south, and Kurume is far from the east in the cities. Although the distance is 900km between Koriyama and Kurume, distance of Guam(13.5N, 144.8E)-Koriyama and Guam-Kurume are 2,699km and 2,819km. The difference is only 120km.
Rank and position of warned cities
(latitude, longitude)
Hachioji(35.67, 139.32)24
Nishinomiya(34.73, 135.33)31
Fukuyama(34.48, 133.37)36
Toyama(36.7, 137.22)41
Nagano(36.63, 138.18)49
Koriyama(37.40, 140.23)63
Otsu(35.00, 135.87)65
Maebashi(36.38, 139.07)68
Kurume(35.32, 130.52)71
Mito(36.4, 140.6)87
Takaoka(36.75, 137.17)below 125
Maizuru(35.47, 135.38)below 125

20th USAAF began to release leaflets on 28 July 1945. Lemay wrote that B-29s released some kinds of leaflet suggesting to flee from fire bombs after the big Tokyo raid on 5 March 1945.

Distance on the Earth
List of Japanese cities by population
Hachiouji(35.67, 139.32)
Maebashi(36.38, 139.07)
Maizuru(35.47, 135.38)
Nagano(36.63, 138.18)
Takaoka(36.75, 137.02)
Toyama(36.7, 137.22)
Watanabe p.407
Super fortress B-29, p207
Airborne leaflet propaganda
Beigun dentan
Tai Beiei Sinri-sakusen

On air, US had released other leaflets to propagate VOA from Saipan using middle wave on 23rd Apr 1945.

 Nuke bombardment and NPT
B-29 could load a nuke and fly to destroy a city and kill more than 100 thousand civilians at once. Only two nuke bombers destoryed Hiroshima and Nagasaki on 6 and 9 August 1945. The nukes proved of the most excellent weapon in the world history. The allied powers decided that they should have nukes by powers and other nations should not have them for themselves. Although Prime Minister Sato singed NPT on 3 February 1970, Government hesitated to ratify because Japanese rulers remembered that US did not bombardment a nuke at Manchuria in Korean War at all. Prime Minister Miki ratified on 8 June 1976 at last.[8] Japanese rulers decided that Japan should live under imaginable US nuke power. Some Japanese people think US might use a nuke against Japan again in future, though US will never use it against China. This is why Japan have to be good relation with China. We know that US never wared against strong powers than herself except Independence War. US always have used arms against inferior nations than herself like traditional Chinese dynasties did.

But Nam War troubled US like a few northern nations and Japan troubled old China. Japan invaded China like traditional barbarians and pirates from the north and the sea in 20th century. I find peak-out of US power at the Nam War judging from ASEAN's diplomatic policy. Small nations always have watched powers.

 Cease fire
Commons of big cities stopped shields of light at home and could sleep well on 15 August 1945, because cease fire stopped B-29s night raids. B-29s did 33,000 sorties and 450 B-29s were lost. The lost ratio was 1.3 % only[4]. Otherwise IJN lost 1,000 air crews per month against USN in Kyushu and Okinawa during Kikusui Operation.

435 B-29s displayed air power over the Tokyo Bay, when Japan surrendered on 2 September 1945. Soon US and Russia were competitve with nukes each other. US also had to fight new wars against China in Korea and Nam twice, as Japan worried about China in Korea and Manchuria before.

 Other 4-engined heavy bomber
IJN was afraid of heavy bombers of B-17 or B-24. IJN could not allow that the heavy bombers reckon ports and patrol the sea.

The USAAF agreed to turn over a batch of B-24 Liberators to the USN, which designated them PB4Y-1s. Ther first of these saw combat with Marine reconnaissance squadron VMD-254 which was sent to Espiritu Santo in October 1942. Other Marine photo-reconnaissance units which saw action with PB4Y-1 were, VMD-154 in January 1943, and VMD-354 a year later. Photo-reconnaissance flights were done at about 22,000ft (6705m).
Dorr, p43, p47

In late April 1943, the Navy's first photographic squadron equipped with B-24s arrived on Espiritu Santo. VD-1 immediately began photographic patrols throughouth the Solomons. The full name of this type of squadron was Fleet Air Photographic Reconnaissance Squadron, which was shortend to VD. The squadron was formed in the spring of 1942 and was equipped with B-24. B-24 aircraft assigned to such squadron were designated PB4Y-1P which were equipped with two 400 gallon fuel tanks in the forward bomb bays, and one of the two rear bays was equipped with 4 mapping cameras, while remainning bay could carry bombs.
Carey ge, p15

USN converted 65 Liberators for photo duty and established four squadrons — VD-1 (January 1943), VD-3 (February 1943), VD-4 (August 1943) and VD-5 (July 1944). I think USN needed reconnaissance to plan invasion and a lot of maps for amphibious operation. I understood how often USN did photo-reconnaissance missions for Iceberg Operation in Okinawa. USN organized three squadrons and prepared invasion in 1943. While IJN built air bases in the Marshall Islands.
Dorr, p44

Self-sealed fuel tank of B-17D
No2Natural rubber2mm
No3Rubber cloth0.5mm
No4Vulcanized rubber0.5mm
No5Sponge rubber4mm
Japan captured B-17D in the end of 1941. IJN was surprised to see self sealed fuel tanks of B-17. So IJN checked the seal of B-17D. The table shows inner layers of the sealed tank. IJN bomber type 96 had made fire by bullets in 1937 in China. IJN flew Nells from Taipei, Ohmura, Saishu to Chaina mailand on 14, 15 and 16 August 1937. Kanoya Air Group decreased 10 working aircraft from 18 during 3 day missions. Kisarazu Air Group 8 from 20 aircraft. Then IJN studied self sealed fuel tank and fire extinguisher. But the study stopped because of weight.
Ikari, p147
Toyou bakugeki

B-17s were diffcult to shoot down. Zero almost shot enemies by 20mm guns except for B-17. The shells could not penetrate armor behind B-17 cockpit. While Betty was fragile for enemy fighters' 13mm shells. Crews of Betty called the aircraft type 1 lighter. By the way, Betty was not installed armor plates till 1943.
Genda, p238

VB-116 began ECM (Electronic Counter Measures) missions in March 1944, flying PB4Y-1 Liberators modified with installation of the AN/ARC-1 radar intercept receiver ‐ similiar to the US Army's SCR-587. The squadron three-ship sorties against Japanese radars on Truk.
Dorr, p44

USN planned B-17 as AEW operation. The designation was PB-1W.

 Award to militian
Ikeda succeeded to the cabinet of Yoshida. Ikeda Cabinet awarded LeMay ( MꓙM ) on 4 December 1964[23][29]. LeMay commanded 21st BC which bombarded over Japan since 20 January 1945[22]. He flew from ( ) to Guam on 7 January[21].

Watanabe wrote that Japanese governers always favored in US and had no concern with national sentiment except his election voters. I think Japan is the same as Philippines. Governers of Philippines awarded US army commanders who killed and punished revolted people. Recently my family watched on DVD of the Addams Family. My son understood the irony of relationship between native Americans and white pioneers or invaders. A white girl wanted to civilize a native American girl in a short drama. Revolted children had to watch on video of Disney. I remembered collecting seals of Disney's charcters in chocolate package[24] when a boy. Our generation absorbed in American pop culture. While Chinese goverment banned abroad animation for kids on 1 September 2006[27]. Chinese kids cannot watch Crayon Shin-chan any more on TV program.

 Biowarfare bomb
Replica of biowarfare bomb
Kanto Army requested IGHQ Communications Department(Houdou bu) for sending press corps on Jul 25 in 1942. The IGHQ Communications Department assigned 10 newspapers of Asahi, Mainichi, Yomiuri, Tokyo, Fukunichi, Domei, Tairikushinpou, Mansyunichinichi, Mansyushinbun, etc. It sheduled to visit cities and see the economy, culture and miliatary for 3 weeks. The Kanto army prepared 1,500 yen of travel pay for a journalist. The money of 1,500 yen costed a home with landestate in the country of Japan.

The Kanto army held a press meeting in Harbin Secret Military Agency on Aug 11. Asaoka showed a recorded film used a new weapon in China. The screen showed a Ki-48 loading something like a milk pan and 15 or 20 small ones.[11] The bomber took off. And The screen showed a field. The bomber released white vessels. It returned, some medics sprayed inner of the bomber. Asaoka said,'This film was made by an epidemic prevention department in Harbin. We made a trial of bio weapon in the middle of China.
Morimura p.166-p.182

The photo shows replica of IJA biowarfare bomb. The principle was developed Unit 731 in Manchuria. Although Japan could not develop nuclear bomb, Biowarfare weapon was developed by notorious 731 Unit of IJA in Manchuria. The bio weapon might hurt civilians as well as nuke, but it did not work as well IJA expected. It could not replace for usual explosive bombs. I don't know when the US knew 731 Unit. When IJA used chemical weapon in China, the US warned Japanese govenment the usage. Tojo stopped it for fearing US Army usage.

[1] Tokyo shijyo no kaitaku to eigyo-sho kaisetsu
[2] Kessen Kyoiku sochi-youkou
[3] Watanabe, p242-248
[4] Watanabe, p426
[5] B-29, B-29 shutsugeki list
[6] Super fortress, p.64
[7] Kerr, p192
[8] j̕sgUɊւ S
[9] Watanabe, p378
[11] Ki-48
[21] Super fortress B-29, p178
[22] Super fortress B-29, p176
[23] Super fortress B-29, p302
[24] Marble chocolate
[27] { no e
[29] ( Mꓙ )

© 2007-2011 Enoki Sensor All Rights Reserved