The B-29 Doc, the Wichita Volunteers, and the Three Hundred Thousand Hours That Brought a Superfortress Back to Life

On July 17, 2016, a Boeing B-29 Superfortress named Doc lifted off from Dwight D. Eisenhower National Airport in Wichita, Kansas - the same city where she was built in 1944. The flight was the culmination of 13 years and 300,000 volunteer hours of restoration work. It mattered because only two flying B-29s exist anywhere on Earth, out of nearly 4,000 built.

What Made the B-29 Superfortress Revolutionary

The B-29 was the most technologically advanced production aircraft of the Second World War. While other heavy bombers forced crews to fly at altitude in open, unheated, unpressurized compartments - enduring temperatures that could reach 40 degrees below zero - the B-29 had a pressurized, heated forward cabin. In 1944, breathing unpressurized cabin air at 25,000 feet was close to inconceivable.

The remote-controlled gun turrets were equally ahead of their time. Gunners on most bombers stood at open windows in the freezing slipstream, or folded themselves into plexiglass ball turrets. On the B-29, gunners sat inside the pressurized fuselage and aimed through optical periscopic sights, operating gun positions they weren’t even standing next to.

The aircraft’s range was unmatched. The B-29 could carry a meaningful bomb load from the Mariana Islands to the Japanese home islands and return - roughly 1,500 miles each direction. No other Allied bomber could come close.

The Engines: Power and Reputation

Four Wright R-3350 Duplex Cyclone engines powered the Superfortress. Each produced over 2,000 horsepower at takeoff, with 18 cylinders arranged in two banks of nine. Each engine drove a four-bladed propeller 16.5 feet in diameter.

Together, those four engines pushed a fully loaded B-29 - over 100,000 pounds of aircraft - to 33,000 feet, with a cruise speed exceeding 220 miles per hour. It was the heaviest production aircraft ever flown to that point in history.

The R-3350 had a complicated reputation even in active service. It ran hot and demanded constant, careful management from the flight engineer. B-29 engine fires over the Pacific were not a theoretical risk. They happened, and they cost aircraft and lives. The cowl flap design created cooling challenges that crews had to actively manage every hour of every flight.

The Cost: More Than the Manhattan Project

The B-29 development program cost the United States more than the Manhattan Project - more than the atomic bomb. Both programs ran simultaneously, and the airplane cost more. Reaching Japan and returning required solving engineering problems that had never been solved before, on a timeline that didn’t allow for the normal pace of aviation development.

Much of that problem-solving happened in Wichita, Kansas. Boeing’s Wichita plant ran around the clock - day shift, night shift, weekend shift. Beechcraft and Cessna were building there simultaneously. Wichita earned its title as the Air Capital of the World. A significant portion of the nearly 4,000 Superfortresses produced came off Kansas production lines.

Doc’s History: From Combat to the Desert

Doc - official serial number 44-69972 - came off the Wichita production line in 1944. She flew combat missions in the Pacific, then returned to service during the Korean War. After that, she was transferred to the Naval Air Weapons Station at China Lake in the California desert, where the Navy intended to use her as a static maintenance training aid.

She was never bombed. She was never scrapped. She just sat.

From 1956 to 1998 - 42 years - Doc remained in the open Mojave air. The desert’s dry climate slows corrosion in ways that coastal or humid environments would not. But four decades are four decades. Engines don’t care about climate. Rubber components don’t. Wiring insulation doesn’t.

Her name came from the cartoon doctor character painted on her nose during her active service days - nose art in the Pacific tradition.

Why the Restoration Became Urgent

By the late 1990s, anyone paying attention to the global B-29 population arrived at an uncomfortable number. Out of nearly 4,000 built, one was flying. One. Fifi, operated by the Commemorative Air Force out of Midland, Texas - a magnificent airplane, maintained by people doing work that matters. But one thread is fragile.

The Kansas Aviation Museum took custody of Doc in 2003 and moved her back to Wichita. She had been born there.

300,000 Hours: How Volunteers Rebuilt a Superfortress

This is not the story of a wealthy collector or a government program. It is the story of people who showed up.

Tony Mazzolini, a retired airline captain, stepped forward to lead the restoration. He was not a household name. He gathered a team - mostly volunteers. Retired airline mechanics who had spent careers keeping jets flying. Former military maintenance personnel who understood reciprocating engines. Sheet metal workers. Engine overhaul specialists. Structural engineers who donated their weekends.

They set up at what is now Eisenhower National Airport in Wichita and began the only way they could: by taking Doc apart and finding out what they actually had.

Some of it was encouraging. The desert had preserved more structure than feared. But corroded wiring is corroded wiring. Rubber hoses static for 50 years don’t spring back to life. Hydraulic components, fuel lines, control cables threading through that enormous fuselage - all of it required inspection before anything could be known.

Sourcing parts for a B-29 in the 21st century means working a network built on decades of relationships. A call goes out: does anyone have a specific component for a Wright R-3350? The answer might come back from a collection in Ohio, a retired mechanic in Arizona, or a British aviation museum with spare parts in a crate, willing to hand them over to the right project.

Some of the people who started the restoration in the early years did not live to see Doc fly. They came anyway. They worked. They went home. They came back the next weekend. Over 13 years of Saturdays, evenings, and stretches of annual leave, that accumulated to 300,000 volunteer hours.

July 17, 2016: Doc Flies Again Over Wichita

When Doc taxied out and the four Wright R-3350 Duplex Cyclone engines lit and ran the way they were designed to run, the sound reached across the field and hit people from a quarter mile away.

Four big radials at takeoff power is unlike a turbine. A turbine sings. Four radials at full song are percussive. It hammers. It is the sound of organized, controlled explosion happening 18 times per cylinder, per engine, 64 firings per revolution, across four engines simultaneously. It doesn’t just travel through the air. It travels through the ground and up through your boots.

Doc rotated and climbed out over Wichita. The city where she was built - by workers who ran production lines in shifts that didn’t stop - watched one of their airplanes return to the sky above them more than 70 years later.

A lot of people on that flight line were crying. This was not a new paint job. This was a four-engine heavy bomber, built in this city, flown in combat, forgotten for most of half a century, and brought back by ordinary people who refused to accept that it was over.

Doc Today: What the Preservation Means for Aviation

Doc is now operated by Doc’s Friends, a Kansas nonprofit. She travels to airshows around the country, and ride programs allow the public to actually fly aboard a B-29.

There are two flying B-29s on Earth. Doc and Fifi. Two, out of nearly 4,000 built. The reason the number is two instead of one is because a group of people in Wichita refused to accept the alternative.

Up close, photographs don’t capture the scale. The fuselage is the width of an early airliner. The forward canopy is a greenhouse of curved plexiglass panels. The bubble turrets where gunners sat scanning Pacific skies for enemy fighters. The nose art. The aluminum that workers’ hands formed in Kansas in 1944, that flew through Pacific air carrying men mostly in their twenties, doing a job that history has since made sound inevitable - but which at the time felt anything but.

Key Takeaways

The B-29 Superfortress was the most advanced production aircraft of World War II, featuring pressurized crew compartments, remote-controlled gun turrets, and intercontinental range - and its development program cost more than the Manhattan Project.
Doc (serial number 44-69972) was built in Wichita in 1944, served in both the Pacific and Korean War, then sat in the Mojave Desert for 42 years before her restoration began.
The restoration, led by Tony Mazzolini and a largely volunteer workforce, took 13 years and 300,000 hours of labor before Doc’s first flight on July 17, 2016.
Only two B-29s are airworthy anywhere in the world - Doc and Fifi - out of nearly 4,000 built. Doc’s restoration is the direct reason that number is two instead of one.
Doc is operated by Doc’s Friends, a Kansas nonprofit, and offers public flight experiences at airshows across the country.