Doc the B-29 Superfortress, the China Lake Discovery, and the Three Hundred Fifty Thousand Volunteer Hours That Put Wichita's Last Flying Bomber Back in the Air

Doc, the B-29 Superfortress with serial number 44-69972, is one of only two airworthy B-29s in the world. Built in Wichita in 1945, discovered abandoned at China Lake, California, and restored through an estimated 350,000 volunteer hours, Doc flew again on July 17, 2016 - a comeback that took the better part of two decades.

What Made the B-29 Superfortress So Revolutionary

The Boeing B-29 Superfortress was the most technologically advanced bomber ever built when it entered service. It wasn’t an incremental improvement on existing designs - it was a generational leap.

The B-29 was pressurized. Crews flew at high altitude in a sealed environment, without oxygen masks or heated suits, through ten- to twelve-hour missions. The forward compartment housed pilots, the bombardier, and the flight engineer; a pressurized tunnel connected it to the rear gunners’ station over the bomb bays. No production bomber had ever offered this.

Its range was nearly 4,000 miles with a full bomb load. A B-29 could lift off from the Mariana Islands in the central Pacific, reach Japan, deliver its payload, and return. No other Allied aircraft could do that. The B-29 existed specifically to bring the air war to the Japanese home islands from a base the Japanese could not threaten.

The Wright R-3350 Engines - and the Crash That Defined the Program

Power came from four Wright R-3350 Duplex Cyclone radials - 18 cylinders in two rows of nine, producing 2,200 horsepower each. At maximum takeoff weight, a fully loaded Superfortress grossed over 130,000 pounds. Those four engines were responsible for lifting 65 tons off the runway and climbing to 30,000 feet.

Those engines had a reputation, and it was earned.

On February 18, 1943, the second XB-29 prototype departed Boeing Field in Seattle on a test flight. Eddie Allen, Boeing’s chief test pilot and one of the most respected in the country, was at the controls. An engine fire broke out shortly after takeoff. The crew fought it. It spread. The aircraft was returning to the field when it struck a meatpacking plant on the airfield’s edge. All 11 crew members died. 20 workers in the building also died. Eddie Allen was gone.

The Army Air Forces did not cancel the program. Engineers redesigned the engine cooling, fire suppression, and nacelle. The fixes worked - mostly. Even in production aircraft, engine fires remained a known risk, and crews drilled the fire procedure until the response was automatic. The R-3350 was never a tame engine. But it was manageable, and when it was running right, it had extraordinary range.

Wichita Built Them - and Wichita Saved One

The Boeing Wichita plant was the heart of B-29 production. Running three shifts a day, seven days a week, its workforce - predominantly women, as the men were overseas - turned out Superfortresses alongside facilities in Renton and Marietta. More than 1,600 aircraft from the total production run of over 3,700 came off the Wichita lines. Wichita’s reputation as the Air Capital of the World was not incidental.

The B-29’s place in history was sealed on August 6, 1945, when Enola Gay, flown by Colonel Paul Tibbets, dropped a uranium bomb called Little Boy on Hiroshima. Three days later, on August 9, Bockscar, flown by Major Charles Sweeney, dropped a plutonium bomb called Fat Man on Nagasaki. Twelve days after Nagasaki, Japan surrendered.

Whatever the historical verdict on those decisions, the B-29 Superfortress is the aircraft that ended the most destructive war in human history. Every surviving airframe carries that weight.

How Doc Was Found in the Mojave Desert

After the war, the fleet dispersed with astonishing speed. Military budgets collapsed, strategic needs shifted, and thousands of aircraft built at enormous cost were scrapped, stored, or simply left in place. A small number served in Korea, where they encountered MiG-15 jet fighters that had closed the performance gap entirely. High-altitude daylight formation bombing was no longer viable, and the B-29’s combat career ended.

Some airframes ended up at test facilities. The Naval Air Weapons Station at China Lake, California, received several, used for training purposes including firefighting drills. Doc - serial 44-69972, built in Wichita in 1945 and delivered for the Pacific theater too late for combat - eventually arrived at China Lake. When no longer needed, she was left where she sat.

In the 1980s, an aviation enthusiast from Wichita found her. The paint was gone. The guns had been stripped. But the aluminum structure had held. The same desert heat that had baked away the markings had kept moisture out of the airframe. Aluminum doesn’t rust. Corrosion had found its way in at the margins, but the basic structure was far more intact than decades of Mojave exposure had any right to produce.

He made himself a promise. This airplane was going to fly again.

What the Restoration Actually Required

The aviation community in Wichita organized around recovering the aircraft. Doc came home - to a facility not far from where she had been built in 1945. What they found under cover was a mixture of encouraging and daunting: the basic structure was largely intact, but virtually every system required a complete rebuild.

Engines. Electrical. Hydraulics. Instruments. Fuel systems. And parts.

Finding parts for a B-29 in the 21st century is nothing like ordering components for a Cessna 172. There is no catalog, no distributor warehouse. When a specific bracket, actuator, or fitting is needed, the options are: find it on another B-29 wreck, source a machined reproduction from the small network of suppliers who make them in limited quantities, or fabricate it from scratch. The Doc team did all three, repeatedly, over many years.

The 350,000 Volunteer Hours Behind Doc’s Return

The volunteer force that gathered around this project was the kind that only aviation produces. Retired Boeing engineers whose careers had overlapped with aircraft built in the same factory decades earlier. Former military mechanics who had worked on B-29s during Korea. Sheet metal workers from Cessna, Learjet, and Beechcraft. People who had never touched an aircraft before in their lives, who showed up on a Saturday morning willing to learn - and came back every Saturday for years.

The figure most often cited is approximately 350,000 volunteer hours. At a standard 40-hour workweek, that is the equivalent of roughly 168 years of continuous work by a single person. That number is a measure of the scale of commitment required to return a 60-year-old heavy bomber from outdoor desert storage to airworthy condition.

They named her Doc - after one of the Seven Dwarfs. The name fits. She had been nursed back by hundreds of dedicated people over the better part of two decades.

Doc’s First Flight: July 17, 2016

On July 17, 2016, Doc flew for the first time since her restoration. The crew included experienced warbird pilots alongside engineers from the restoration team who knew the systems intimately.

The four Wright R-3350s started. All of them. Overhauled and tuned by people who had spent years on them, they came to life on the ramp. Four-bladed propellers on Wright radials produce a sound unlike anything in modern aviation - a mechanical thunder felt in the chest before it reaches the ears, a rhythmic hammering that makes the concrete vibrate. When all four of Doc’s engines came up together, that sound rolled across the Wichita ramp for the first time in decades.

She taxied. She lined up. The throttles went forward. She flew.

The volunteers who had given years of Saturdays to that moment had trouble finding words when asked about it afterward. Some of them cried - not from sentimentality alone, but from the recognition that the thing they had committed years of their lives to was real, was airborne, was doing what it was built to do.

Why Doc Still Matters

Today, only two B-29 Superfortresses fly anywhere in the world: Doc and FIFI, operated by the Commemorative Air Force. Between them, they represent what remains operational from a production run of more than 3,700 aircraft. Everything else is a static display, salvage, or dust.

Doc tours air shows and flies regularly, managed by the Doc’s Friends and Foundation in Wichita. When she appears at an event, the grandstands fill. The sound arrives before she is visible - that rolling thunder from four radials at low altitude - and the crowd goes quiet in a way crowds at air shows almost never do.

Restoration work at this scale is an act of defiance against entropy. The machines of the past will not survive unless people choose, with intention and sustained effort, to push back against their decay. The Doc restoration is one of the most ambitious volunteer aviation projects in history, and it succeeded because a remarkable number of people decided this particular aircraft was worth the cost.

They were right.

Key Takeaways

Doc (serial 44-69972) is one of only two airworthy B-29 Superfortresses in the world, alongside the CAF’s FIFI.
The B-29 was the first pressurized production bomber, with a combat range of nearly 4,000 miles - the capability that made the Pacific air campaign against Japan possible.
After decades of desert storage at China Lake, California, Doc was returned to Wichita and rebuilt through approximately 350,000 volunteer hours over nearly two decades.
Doc’s restored first flight took place on July 17, 2016, in Wichita - the same city where she was built in 1945.
Of more than 3,700 B-29s produced, only two remain in flying condition.