Doc, the Boeing B-29 Superfortress That Came Back from China Lake, and the Sixteen Years of Volunteer Work That Turned a Navy Fire Trainer Back Into a Flying Warbird

Doc, a Boeing B-29 Superfortress with serial number 44-69972, spent decades at the China Lake Naval Weapons Center being deliberately set on fire by Navy firefighting crews. In 1987, a man named Tony Mazzolini found her there and started the chain of events that would eventually return her to the sky. What followed was a sixteen-year restoration effort - one of the most demanding in warbird history - that ended with Doc’s first flight on July 17, 2016, over Wichita, Kansas.

What Made the B-29 Superfortress Different From Every Other WWII Bomber

The B-29 was not simply a larger version of what came before it. When the Army Air Forces approached Boeing in the early 1940s, the requirements they laid out seemed borderline impossible to most engineers at the time.

They wanted a bomber capable of flying at over 300 miles per hour, carrying ten tons of bombs, operating at altitudes up to 35,000 feet, ranging more than 5,000 miles, and doing all of it with a pressurized cabin so crews could survive at altitude without oxygen masks and heated flight suits. No production aircraft had ever done any of that combination. The B-17 Flying Fortress - already considered a marvel - had none of those capabilities.

The aircraft Boeing produced had a 141-foot wingspan, weighed nearly 100,000 pounds fully loaded, and carried four Wright R-3350 Duplex-Cyclone radial engines producing 2,200 horsepower each. The pressurized crew compartments, connected by a narrow tunnel running over the bomb bays, had never been attempted on a production aircraft at this scale. The remote-controlled gun turrets operated through fire control computers represented technology that had never been proven in combat.

It was an entirely different class of machine - and everyone in the program understood that.

How the Engine Fires Nearly Ended the Program Before It Began

The R-3350 was the most powerful air-cooled radial engine in American service. It was also prone to catching fire. Early production B-29s had cowl designs that caused the engines to overheat during climb. Cylinders cracked. Exhaust collectors failed. Engine fires were killing aircraft and crews before the Japanese had any opportunity to.

The program’s chief test pilot, Eddie Allen, was killed along with his entire crew in February 1943 when engine fires forced down a B-29 prototype over Seattle. Allen was widely regarded as one of the best test pilots in the world, and his death shook the program badly.

The Army’s need for a weapon that could strike Japan from bases beyond the range of Japanese counterattack kept the program alive. Engineers worked to solve the engine problems even as aircraft continued coming off the production line - a continuous refinement process that never fully stopped until the war ended.

Doc’s Origins: Built in Wichita, Flown in the Pacific

Boeing’s Wichita, Kansas facility became the heart of B-29 production. At peak, more than 29,000 workers were employed there - men and women who had never touched an airplane before the war, learning to build the most complex aircraft in the world on three shifts a day, seven days a week. Over 1,600 B-29s rolled out of Wichita during the war.

Doc came off that production line in June 1945, by which point the worst of the engine problems had been worked out through years of iterative fixes. She flew combat missions in the Pacific. After the war, like most of her sisters, she went into storage and eventually ended up at China Lake in the California desert, where dry air was supposed to preserve aircraft indefinitely.

What happened instead was that Navy firefighting crews needed realistic training props. A number of surplus airframes ended up in their hands for that purpose. Sections were set alight repeatedly. The aluminum blackened. The cowlings took damage. Doc was not preserved - but she also was not scrapped. When Tony Mazzolini arrived in 1987, the basic airframe was still present. Battered and burned and missing components, but structurally intact in a way that meant everything to someone who understood what he was looking at.

Eleven Years of Bureaucracy, Then Sixteen Years of Restoration

Getting the Navy to actually release the aircraft took nearly eleven years of parallel effort alongside everything else Mazzolini was doing. The bureaucratic process - legal reviews, custody negotiations, liability arrangements - stretched nearly to the end of the century.

Mazzolini spent that period building the case, finding partners, and laying the groundwork for the nonprofit organization that would carry the restoration. That organization became known as Doc’s Friends. The name was deliberate. This was not a corporate preservation project. It was a community.

By 2000, Doc was on a flatbed truck headed back to Wichita.

The Volunteers Who Carried Knowledge That Exists Nowhere Else

When Doc’s Friends began making calls around Wichita looking for expertise, they kept hearing a version of the same thing.

My father worked on those. I worked on those. I know someone who spent twenty years maintaining those engines.

Some of the Boeing retirees in and around Wichita had actually stood on that factory floor in 1944 and 1945. They had built B-29s with their own hands. They had torqued the bolts and routed the wiring and fitted the cowlings and walked away when the job was done, never expecting to touch one again.

What they carried was not in any manual. When you are building sixteen hundred aircraft in a wartime factory, you do not stop to document the workaround invented on a Tuesday afternoon. You move to the next aircraft in line. The knowledge lives in hands and memory - and without an opportunity to apply it, it disappears with the people who hold it.

The Doc restoration caught it just in time.

The volunteer force that assembled was extraordinary in its range: sheet metal workers, electrical specialists, engine mechanics, instrument technicians, retired Boeing engineers, and aviation history enthusiasts who learned entirely new trades just to contribute something useful. Hundreds of active volunteers were putting in hours at the hangar at peak.

Rebuilding Every System on a 70-Year-Old Aircraft

The work touched every system on the aircraft.

The fuel system - a complex arrangement of tanks, pumps, valves, and crossfeed lines spread across a 141-foot wing - required complete inspection, testing, and certification or replacement of every component. The hydraulic system operating the landing gear, flaps, and bomb bay doors required the same treatment. The electrical system contained wiring in some places more than sixty years old. The pressurization system had to be fully rebuilt to function.

Then there were the four R-3350s.

Finding airworthy examples of an engine out of production since the 1950s is not straightforward. Complete overhauls were required. Parts were sourced from museums, wrecked aircraft, and maintenance shops still carrying old stock in the back of a warehouse. Some components were machined new because the original suppliers had been out of business for thirty years. The machinists who could work to the tolerances required for a reciprocating engine of this era are not numerous - the team found them through word of mouth, often after months of searching.

July 17, 2016: The First Flight

After sixteen years, Doc sat at Jabara Airport in Wichita and prepared for her first test flight.

The crew was experienced - warbird pilots who understood the particular crew-coordination demands of a B-29, which are unlike almost anything else in the warbird fleet. The ground crew had rehearsed every procedure. The spectators gathered at Jabara that morning included people who had given more than a decade to this project. Some of them had been young enough to crawl under the wing without thinking twice when the work began. They were not so young anymore.

When those four R-3350s lit up, the sound alone was something. A deep, rough, resonant thunder felt in the chest before it registers in the ears - 8,800 total horsepower running up on a ramp in Wichita in 2016. The same sound that echoed across the ramps at Tinian Island in 1945.

She flew. She flew beautifully. The faces of the people watching from the ramp recorded in the video of that flight say everything. These were not people celebrating a project milestone. They were watching something they had given years of their lives to - something they had not been certain they would ever see - lift off and climb into a Kansas sky on a July morning.

Where Doc Flies Today and Why It Matters to See Her in Person

Doc now flies the airshow circuit as one of only two airworthy B-29 Superfortresses in the world. The other is FIFI, operated by the Commemorative Air Force, which had been the only flying example for many years before Doc joined her. When both aircraft appear at the same event, it represents something that cannot be replicated with any other type.

Doc flies rides to the public at airshows. The scale of a B-29 does not translate in photographs. A 141-foot wingspan with four large radials hanging under it, the smell of hot oil in the air and the shadow of that wing overhead - it is a different thing in person than it is on any screen. Finding Doc’s schedule and making the drive is worth doing.

The B-29 ended the war in the Pacific. Enola Gay and Bockscar are the most famous examples, but it was the entire campaign - the fire raids over Tokyo, the mining operations in Japanese harbors, the sustained pressure of hundreds of missions launched from the Mariana Islands - that brought Japan to the point of surrender. The tens of thousands of workers who built these aircraft in Wichita, and the men who flew them, did something the world had never seen before.

Doc is the physical connection to that effort. The volunteers who gave sixteen years to bring her back were not restoring a machine. They were keeping a promise to the people who built her.

Key Takeaways

Doc (serial 44-69972) was manufactured in June 1945 in Wichita, Kansas, flew combat missions in the Pacific, and spent decades as a fire-training prop at China Lake Naval Weapons Center before Tony Mazzolini initiated her rescue in 1987
The B-29 Superfortress was categorically more advanced than any WWII bomber before it - pressurized, with a range exceeding 5,000 miles and four engines producing 2,200 horsepower each
The restoration was carried out by the nonprofit Doc’s Friends over sixteen years, drawing critically on the living memory of Wichita-area Boeing retirees who had built B-29s during the war - knowledge that exists in no manual
Doc completed her first flight on July 17, 2016 at Jabara Airport in Wichita, making her one of only two airworthy B-29s in the world alongside FIFI
Doc flies public rides at airshows; experiencing the aircraft in person - its scale, sound, and presence - is not replicable through photographs or video