The Dornier Do 335 Pfeil, the Push-Pull Fighter That Could Touch Four Hundred and Seventy Miles Per Hour on Pistons, and the Only Complete Airframe Left in the World at the Udvar-Hazy Center

The Dornier Do 335 Pfeil is the fastest piston-engine fighter ever built, capable of 474 miles per hour in level flight - faster than the P-51 Mustang, the P-47 Thunderbolt, and every other propeller-driven fighter of the Second World War. Only one complete airframe exists anywhere in the world, and it sits on the floor of the World War II aviation gallery at the Steven F. Udvar-Hazy Center in Chantilly, Virginia.

A Configuration That Makes You Look Twice

The Do 335 stops people cold in that gallery for a reason that takes a moment to register. Walk toward it and you see two propellers - one at the nose, one at the very tail of the aircraft - both turning on exactly the same centerline. One pulling. One pushing. A single thrust axis running the full length of the fuselage.

This was not a gimmick or an experiment. It was the solution to a problem that had troubled twin-engine aircraft design for decades.

The Engineer Who Kept Coming Back to Centerline Thrust

Claude Dornier, born in 1884, trained as a structural engineer before spending his early career at the Zeppelin works. He founded his own aircraft company in 1914 and spent the next twenty-five years building flying boats, bombers, transports, and experimental types. His Do X briefly held the record as the largest aircraft in the world.

One problem kept drawing his attention: asymmetric thrust. Conventional twins mount engines on the wings. Lose one, and all the remaining thrust is concentrated on one side. The aircraft yaws violently toward the dead engine. The rudder fights it. Below a critical minimum control speed, the rudder loses that fight entirely.

Multi-engine pilots know this calculation intimately - it defines every twin-engine takeoff, every emergency checklist, every simulator session. It is the central survival problem of conventional twin-engine flight.

Dornier’s answer was to eliminate the asymmetry. Move both engines onto the centerline. Lose one engine and you lose half your power, but you do not lose directional control. The aircraft handles like a single-engine airplane, just slower. In a combat environment where pilots were already managing speed, altitude, enemy fire, and system failures simultaneously, removing the asymmetric thrust problem was a meaningful tactical advantage.

Two Engines, One Axis, 3,500 Combined Horsepower

The Luftwaffe issued specifications for a fast attack aircraft in 1942, requiring a platform that could serve as a heavy fighter, night fighter, or high-speed attack type. Dornier’s proposal advanced on the strength of its performance projections.

The final configuration used two Daimler-Benz DB 603 engines, each producing approximately 1,750 horsepower. The forward engine occupied the conventional nose position, driving a three-blade tractor propeller. The rear engine sat in the mid-fuselage behind the cockpit, connected by a long shaft to a three-blade pusher propeller at the tail.

Combined output: approximately 3,500 horsepower. For comparison, the P-51 Mustang made roughly 1,490 horsepower from its single Merlin engine. The Do 335 carried more than double that power in a design that handled better than any conventional twin.

The first prototype flew on October 26, 1943, from the Dornier facility at Oberpfaffenhofen in Bavaria. Speed trials returned 474 mph in level flight at altitude.

The comparisons are unambiguous. The P-51 Mustang reached approximately 437 mph. The P-47 Thunderbolt, about 428 mph. The Hawker Tempest, around 432 mph. The Do 335 was faster than all of them by a margin that mattered operationally.

Ground observers described the sound as unlike anything else in the wartime sky - a complex harmonic beat produced by two large propeller discs operating at opposite ends of the fuselage, something closer to a chord than a single engine note. Ground crews reported identifying the aircraft by ear before it came into view.

The Rear Propeller Problem That Required an Explosive Solution

The pusher propeller at the tail created a problem no amount of speed could solve. Three blades, roughly ten feet in diameter, turning at high speed, positioned directly in the pilot’s exit path. Standard bailout procedure for fighters of the era - roll inverted, jettison the canopy, fall clear of the tail - was not available here. Exiting the aircraft at speed meant flying directly into a spinning propeller.

The engineers at Dornier understood this from the earliest design phase. What they built was one of the first sequenced explosive separation systems integrated with an upward-firing ejection seat on any aircraft in the world. The sequence:

Explosive bolts fire and jettison the entire rear propeller assembly - it clears the aircraft.
A second set of charges separates and jettisons the upper vertical tail fin, which would otherwise block the upward ejection path.
The ejection seat fires upward through the now-clear exit.

This sequence had to execute in the correct order, reliably, at any speed in the flight envelope, under any attitude or damage condition, triggered by a single pilot action. Building that reliability with 1943 manufacturing tolerances was a genuine engineering achievement.

Post-war interrogation records from Luftwaffe test pilots describe the Do 335 in normal flight as almost serene - clean directional stability, no propeller torque fighting the controls, no gyroscopic effects working against roll inputs. One pilot said it felt like the aircraft was on rails. That precision made the ejection sequence more unsettling to consider, not less. Everything about the design was deliberate and controlled, except that leaving it required a timed explosion at the tail.

Why the War Ended With Only Thirty-Seven Complete Airframes

The Do 335 arrived into a German industrial base that had been severely degraded by 1943 and 1944. Allied strategic bombing was targeting factory capacity systematically. Raw materials were harder to source. Skilled workers were being conscripted. Every production timeline kept slipping.

Engineers at Dornier continued developing variants regardless - a two-seat night fighter with a second cockpit behind the first, a high-altitude reconnaissance model with extended wingspan, a proposed carrier-based design. Drawings and wooden mock-ups existed for most of these. Few progressed further.

In the end, approximately 37 complete Do 335 airframes were built. In a war where the United States produced over 15,000 P-47 Thunderbolts alone, 37 was not a number that changes strategic outcomes.

The American Technical Assessment at Oberpfaffenhofen

When American forces reached the Dornier facility at Oberpfaffenhofen in the spring of 1945, they found several Do 335 airframes in various states of completion. Technical intelligence teams moved in. American test pilots flew the captured examples.

Their assessment, preserved in Air Technical Intelligence Command records: the Do 335 was the fastest piston-engine aircraft evaluated from captured German production. Handling was rated superior to conventional twins. The centerline thrust configuration had delivered exactly what the design documents promised.

The airframe that became the Smithsonian’s primary example was a pre-production A-0 model, transferred to American custody after the war and placed in long-term storage. It spent decades invisible to the public - the Smithsonian’s postwar collection was vast enough that space, not significance, was the limiting factor. The Wright Flyer was there. The Spirit of St. Louis. The Apollo 11 command module. Display capacity was the constraint.

How the Do 335 Ended Up at Udvar-Hazy

The Steven F. Udvar-Hazy Center opened in December 2003, adjacent to Dulles International Airport in Chantilly, Virginia. Named for aviation entrepreneur Steven Udvar-Hazy following a $65 million donation to the Smithsonian, the facility was designed specifically to house aircraft the National Mall museum had no room to display. The Space Shuttle Discovery is there. The Enola Gay. The SR-71 Blackbird.

And in the World War II aviation gallery, sitting on the floor where visitors can walk completely around it, the Do 335 Pfeil.

The gallery is dense with significant hardware - a Mitsubishi Zero, a Focke-Wulf 190, an Aichi floatplane designed to launch from a Japanese submarine and attack the Panama Canal. All of it built for the worst purposes. All of it now bearing witness to a period when aviation technology advanced faster than at almost any other point in history, driven by a war that applied unlimited urgency and unlimited resources to anyone who could make an aircraft go faster, higher, or farther.

Claude Dornier died in 1969, having spent fifty-five years in aircraft design. He watched the piston fighters he knew so well become museum pieces within a decade of the war’s end. He saw the jet age arrive and accelerate far past what pistons could reach. But late in that long career, he built one aircraft that pushed the piston fighter to its absolute limit - 474 mph on two engines, both on the centerline, one propeller in front and one in back - and it still stops people cold in a museum gallery more than eighty years later.

Key Takeaways

The Do 335 Pfeil reached 474 mph in level flight, outpacing the P-51 Mustang (437 mph), P-47 Thunderbolt (428 mph), and Hawker Tempest (432 mph) - making it the fastest piston-engine fighter of the war.
Its tandem-engine, centerline-thrust configuration eliminated the asymmetric thrust problem inherent to conventional twins, giving it single-engine handling characteristics on an engine-out emergency.
The rear pusher propeller required one of the first sequenced explosive ejection systems ever built: the propeller assembly and upper tail fin had to be jettisoned in sequence before the seat could fire upward.
Only approximately 37 complete airframes were built; American technical teams confirmed its performance superiority after capturing the Oberpfaffenhofen facility in spring 1945.
The only complete surviving example is on display at the Smithsonian’s Steven F. Udvar-Hazy Center in Chantilly, Virginia, accessible to the public on the floor of the World War II aviation gallery.