The B-29 Superfortress is literally the deadliest bomber in human history. And its story isn't just about atomic bombs. Those came at the end. There are things even worse that don't get talked about nearly as much.
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| The B-29 Superfortress |
A Bomber That Killed Its Own Crews
By 1942, the Japanese home islands sat far beyond the routine reach of American heavy bombers. B-17s and B-24s could barely reach them, and their crews fought fatigue and cold at high altitude without pressurization. The Army Air Forces wanted something that could fly higher, carry more, and keep its people alive getting there and back.
Boeing's answer was a leap forward. The B-29 carried its crew inside two pressurized compartments connected by a small crawl tunnel over the bomb bays. Remote power turrets used analog computers to solve targeting math automatically. Four Wright R-3350 engines producing roughly 2,200 horsepower each pushed it above 28,000 feet. Maximum bomb loads could reach 20,000 pounds on short missions, but long-range strikes meant trading bombs for fuel.
But those R-3350 engines were temperamental with a tendency to overheat and catch fire without warning. The second prototype crashed during a test flight after an engine fire, killing the crew and people on the ground. Crews feared their own engines more than Japanese fighters because once a B-29 caught fire far from base, there was little they could do. Training accidents, engine fires, and emergency landings stacked up before they even went to combat.
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| The B-29 Superfortress Crew |
The Deadly Winds
The first operations in 1944, flown from India and staged through China, showed that reaching Japan was possible but unsustainable. Every gallon of fuel had to be flown across the Himalayas. Crews called it the Hump, and the bombers burned most of their fuel just getting across the mountains.
The first strike against the home islands hit the Imperial Iron and Steel Works at Yawata on June 15th, 1944. It proved Japan was within reach, but the damage was modest compared to the effort.
Then came the real problem. At bombing altitude, crews encountered winds well over 200 miles per hour. They had stumbled into the jet stream. Bomb runs became impossible to time correctly. Bombs were blown far off their targets, and fuel calculations were thrown completely out of balance. Some crews never made it back, ditching into the sea when headwinds drained their tanks dry.
The capture of the Marianas in mid-1944 changed the logistics. From Saipan, Tinian, and Guam, every major Japanese city was within range. North Field on Tinian alone had four massive runways and became the largest bomber base of the war. But the wind problem and poor results from high-altitude precision bombing didn't go away.
Setting Cities on Fire
In January 1945, General Curtis LeMay took command and abandoned the original doctrine entirely. Instead of tight formations at 30,000 feet, he ordered low-altitude night attacks by individual bombers. Defensive guns were stripped out except the tail gun. The extra capacity was filled with fuel and incendiary bombs.
The weapon of choice was the M-69, a small cylinder filled with napalm gel. Dozens were packed into clusters, scattered in midair, and smashed through the roofs of Japanese houses built of wood and paper before bursting into flames.
On the night of March 9th, 1945, over 300 B-29s flew over Tokyo at only 5,000 to 9,000 feet. What followed was the single deadliest air raid in history. In just a few hours, about 16 square miles were reduced to ashes. Over 90,000 people were killed. A million were left homeless. More than 250,000 buildings were destroyed. People leaped into canals and reservoirs to escape the flames, but the water itself began boiling from the heat.
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| Firebombing of Tokyo |
More civilians died in Tokyo that single night than in either Hiroshima or Nagasaki.
In the months that followed, 66 Japanese cities were burned in turn. By August, about 40% of Japan's urban area had been destroyed. Millions were homeless.
The Crews Who Never Came Back
When a B-29 went down, the crew had two choices: ditch in the ocean or bail out over enemy territory. Neither promised survival.
In the sea, each man had a one-man raft, a mirror, dye marker, and emergency radio. Submarines waited near target areas, and flying boats could pick up survivors. Sometimes it worked. Other times, storms blew in or crews drifted too close to Japan, and rescue never came.
Landing in Japan itself was far worse. Captured airmen were not treated as regular prisoners. Japanese law branded them as war criminals because of the bombing campaign. Interrogations and punishments went far beyond what can be described here. Some were locked inside city prisons and killed by their own side's firebombs during subsequent raids. In Kyushu, downed crewmen became subjects of medical experiments that reached a level of cruelty words can barely describe.
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| A downed B-29 Crewmember in Japanese Custody |
The Atomic Bombs and After
On August 6th, 1945, a specially modified B-29 dropped the first atomic bomb on Hiroshima. Three days later, another hit Nagasaki after diverting from the original target of Kokura. Tens of thousands died instantly, with many more following from radiation sickness. Among the dead were Allied prisoners who had survived being shot down, only to be killed when the bombs detonated above their heads.
A third bomb was already prepared with more to follow if Japan hadn't surrendered. After the war, the B-29's nuclear story continued at Bikini Atoll in 1946, where one dropped another atomic device during Operation Crossroads. The underwater blast coated warships in radioactive fallout that couldn't be scrubbed off. Many had to be scuttled.
Then came Korea, where the Superfortress initially seemed to fit its old role. But Soviet-built MiG-15 jets were faster, heavily armed, and far beyond what a piston bomber could handle. After one especially costly daylight raid in October 1951, the order came: no more daylight attacks. The B-29 flew at night from then on, and the age of the Superfortress was over.
Over 90,000 people killed in a single night in Tokyo. Sixty-six cities burned. Crews who feared their own engines more than enemy fighters. And airmen who survived being shot down only to face horrors on the ground that can't be described here. The B-29 was the deadliest bomber ever built, and its story is darker than most people realize.
Written by Andreja Rakočević, a military history writer and co-creator of the RogerRoger YouTube channel.