Fokker Dr.I Triplane — History, Specs, Photos & the Red Baron

A Fokker Dr.I Triplane flying replica in the air, showing its three stacked wings
Military Aircraft Encyclopedia · WWI Fighter · Fokker Dr.I Triplane

Fokker Dr.I Triplane
“The Red Baron’s three-winged fighter”

The Fokker Dr.I was the three-winged German scout that carried Manfred von Richthofen — the “Red Baron” — to his last victories and his death in April 1918. Slow in a straight line but astonishingly agile, it could out-climb and out-turn almost anything in the sky in expert hands, and its silhouette became the most recognisable shape of First World War aviation.

~185 km/hMax speed · ~115 mph
3Stacked wings (Dreidecker)
~320Built, 1917–1918
1917First flight
Photo: Julian Herzog (CC BY 4.0), flying replica at Hahnweide, 2011
Role Single-seat fighter (scout)Era 1917–1918Engine Oberursel Ur.II rotary, ~110 hpOrigin Germany · FokkerStatus Retired · flying replicas onlyCan you fly in a Fokker Dr.I?
The Story

The Fokker Dr.I Triplane: the Red Baron’s three-winged fighter

In early 1917 the British Sopwith Triplane gave the Royal Naval Air Service a fighter that could climb and turn better than the German scouts it met. German aces, Manfred von Richthofen among them, were impressed — and Germany’s aircraft firms were asked to answer it. At Fokker, the self-taught designer Reinhold Platz produced a triplane of his own: the V.4 prototype, which matured into the Fokker Dr.I — “Dr” for Dreidecker, three-decker.

The formula was extreme. Three short, stacked wings gave a large lifting area on a very compact, light airframe. The result climbed hard and turned tighter than almost any contemporary, even if its top speed — around 185 km/h (115 mph) — left it slower than the SPAD XIII and S.E.5a it fought. In the hands of an expert dogfighter who fought in the vertical, that agility was worth more than speed.

Two men made the type a legend. On 23 September 1917 the 20-year-old ace Werner Voss, flying an early pre-production triplane, held off a whole flight of British S.E.5a scouts single-handed in one of the most famous dogfights of the war before he was finally shot down. And it was in an all-red Dr.I, serial 425/17, that Manfred von Richthofen — already the war’s top-scoring ace — flew his final combats. He was killed on 21 April 1918 over the Somme.

The Dr.I’s front-line career was short and troubled. A run of fatal upper-wing failures in late 1917 grounded the fleet within weeks of its debut; the wings had to be rebuilt before the type flew again. Only about 320 were built, and by mid-1918 it was outclassed and being replaced. Yet no aircraft of the war is more instantly recognised — the shape of the Red Baron’s triplane became, and remains, the very symbol of the 1914–18 air war.

“It climbed like a monkey and turned like the devil.”A period verdict on the triplane’s vertical agility
01Why the Fokker Dr.I exists: the Sopwith Triplane and the race to answer it

The Sopwith Triplane stunned German pilots in the spring of 1917 with its rate of climb and manoeuvrability. The German high command issued a requirement for triplane fighters, and several firms responded. Fokker’s Reinhold Platz, working from the company’s welded steel-tube fuselage and thick cantilever wooden wings, built the V.3 and refined V.4 prototypes in mid-1917.

Two pre-production examples, designated F.I, were sent to the front for evaluation in August 1917 — one flown by Richthofen, one by Werner Voss. Their enthusiastic reports led to a production order for the aircraft that became the Dr.I. Ironically, by the time it reached the squadrons in numbers, the Sopwith Triplane that inspired it had already been withdrawn from front-line British service.

02The Fokker Dr.I’s markings: Richthofen’s all-red 425/17 and the “Flying Circus”

Manfred von Richthofen led Jagdgeschwader 1, a grouping of four fighter squadrons whose brightly-painted aircraft and habit of moving by train to wherever the fighting was hottest earned it the Allied nickname “the Flying Circus”. Richthofen’s own machines were famously painted overall red — giving him the names der Rote Baron (the Red Baron) and le petit rouge.

His last aircraft, Dr.I 425/17, is the most-modelled aeroplane of the war. Period German markings were the straight-armed black-and-white Balkenkreuz and earlier cross-pattée (the “Iron Cross”) national insignia. These are authentic historical markings and appear on museum aircraft and replicas today.

Design & Engineering

How the Fokker Dr.I worked: three wings, a rotary engine and twin Spandaus

01

Three stacked wings

The Dr.I’s defining feature was its three short, thick cantilever wooden wings, one above the other. Stacking the lift this way gave a big wing area on a tiny, light airframe with a short span, so the triplane could climb steeply and turn in a very small circle — at the cost of extra drag and a low top speed. Small “wings” on the landing-gear axle even added a little more lift.

02

A rotary engine and knife-edge handling

Power came from a rotary engine — usually the Oberursel Ur.II of about 110 hp, a copy of the French Le Rhône, with the whole engine spinning with the propeller. Its gyroscopic effect made the Dr.I turn viciously fast one way and reluctantly the other, a quirk expert pilots exploited in a dogfight but which could catch out the unwary.

03

Steel-tube fuselage, twin machine guns

Behind Fokker’s trademark welded steel-tube fuselage sat the pilot and two synchronised 7.92 mm LMG 08/15 “Spandau” machine guns firing through the propeller arc. The cockpit put the guns right under the pilot’s eyes for close-range aiming — the triplane was built to fight at knife-fighting distance, not to run.

03The Fokker Dr.I’s wing failures: why the triplane was grounded in 1917

Within weeks of reaching the front, Dr.Is began shedding their upper wings in flight. In late October 1917 two well-known pilots — Heinrich Gontermann and Günther Pastor — were killed when their wings broke up, and the whole type was grounded pending investigation.

The inquiry blamed poor workmanship and moisture: water had got into the wooden wing structure, weakening the ribs and the glue and letting the upper wing flex and fail. Fokker was ordered to rebuild the wings with better sealing and construction. The modified aircraft returned to service around the end of 1917, but the episode dented confidence in the design and slowed its deployment.

04Rotary engines and castor oil: the Fokker Dr.I’s engine problems

Rotary engines were lubricated with castor oil, which was total-loss — sprayed out through the engine and breathed in by the pilot. By 1917 the Allied blockade had cut Germany off from natural castor oil, and the synthetic substitutes used in its place were poor. This hurt reliability and performance and is one reason production and serviceability of the Oberursel-engined Dr.I were limited.

Some Dr.Is were fitted with captured or licence-built Le Rhône engines, which ran better. Power across the type was broadly similar — on the order of 110 hp — but the engine supply was a constant headache.

05Who designed and built the Fokker Dr.I: Reinhold Platz and Anthony Fokker

The Dr.I was built by the Fokker company of the Dutch entrepreneur Anthony Fokker, working in Germany. The detailed design is credited to Reinhold Platz, a gifted welder and self-taught engineer who favoured thick, internally-braced cantilever wings and welded steel-tube structures — ideas well ahead of the wire-braced norm of the day and visible in later Fokker fighters such as the D.VII.

Specifications

Fokker Dr.I specifications: dimensions, performance and cost

Airframe & weights

Crew
1 (pilot)
Length
5.77 m (18 ft 11 in)
Wingspan (upper)
7.19 m (23 ft 7 in)
Height
2.95 m (9 ft 8 in)
Wings
3 (triplane / Dreidecker)
Empty weight
~406 kg (895 lb)
Loaded weight
~586 kg (1,290 lb)
Number built
~320 (commonly cited)

Powerplant, performance & cost

Powerplant
1 × Oberursel Ur.II 9-cylinder rotary (copy of the Le Rhône); some Le Rhône-engined
Power
~110 hp (82 kW)
Max speed
~185 km/h (115 mph) — figures vary by source
Rate of climb
exceptional for its day; ~1,000 m (3,300 ft) in ~2.5–3 min
Service ceiling
~6,100 m (20,000 ft), approx.
Endurance
~1.5 hours
Armament
2 × 7.92 mm LMG 08/15 “Spandau” machine guns
Unit cost (period)
No reliable figure survives; wartime unit prices are not consistently documented
Cost per flight hour
No modern figure exists for an original (none are airworthy); replica operating costs vary widely and are not a like-for-like measure
06Fokker Dr.I performance: why three wings meant great climb but low speed

The triplane layout traded speed for agility. Three wings meant a large lifting area and low wing loading, so the Dr.I climbed and turned superbly but generated a lot of drag and could not chase down faster Allied fighters. Contemporary scouts like the S.E.5a and SPAD XIII were 30–40 km/h faster and could dive away from a triplane at will.

Performance figures in the sources vary — different engines, loads and individual aircraft give different numbers — so treat the quoted top speed and climb as approximate.

07What a Fokker Dr.I costs today: originals, replicas and flying reproductions

There is no meaningful modern “cost per flight hour” for an original Fokker Dr.I, because none survive in airworthy condition — every flying triplane is a modern reproduction. Reliable wartime unit-cost figures are also not consistently documented.

What can be said is that airworthy replicas are hand-built to order and are expensive to construct and maintain, with rotary or substitute engines that need specialist care. Any single “operating cost” number would be an estimate for one particular replica, not a figure for the historic aircraft — so we deliberately do not quote one.

Timeline

The Fokker Dr.I: a timeline from the Sopwith Triplane to the Red Baron’s death

1917 (spring)

The Sopwith Triplane sparks a response

The British Sopwith Triplane’s climb and agility prompt Germany to seek a triplane fighter of its own.

1917 (July)

The V.4 prototype flies

Fokker’s Reinhold Platz flies the V.4 prototype that will become the Dr.I.

1917 (Aug)

F.I triplanes go to the front

Two pre-production F.I triplanes reach the front; Richthofen and Werner Voss fly them in combat.

23 Sept 1917

Werner Voss’s last fight

Werner Voss is killed after a legendary lone dogfight against British S.E.5as while flying a triplane.

Oct–Nov 1917

Wing failures ground the type

A series of fatal upper-wing failures grounds the Dr.I; the wings are investigated and rebuilt.

Winter 1917–18

The triplane returns with the Flying Circus

Modified Dr.Is return to service and equip Jagdgeschwader 1, Richthofen’s “Flying Circus”.

21 April 1918

The death of the Red Baron

Manfred von Richthofen is killed over the Somme flying all-red Dr.I 425/17.

Mid–late 1918

Outclassed and withdrawn

Outclassed and replaced by the Fokker D.VII; only about 320 Dr.Is were ever built.

Stories & Eyewitnesses

The Fokker Dr.I in action: aces, legends and the wings that failed

Werner Voss

23 September 1917: one triplane against a whole flight

The war’s most famous dogfight was fought in a Fokker triplane.

Read the full account
Flying an early pre-production Fokker triplane, 20-year-old ace Werner Voss ran into a flight of seven S.E.5a scouts of Britain’s 56 Squadron over the Western Front. Instead of fleeing he fought them all, twisting and turning for some ten minutes and hitting nearly every British aircraft before he was finally shot down and killed. His opponents, several of them aces themselves, wrote of him afterwards with open admiration — it became the most celebrated single dogfight of the war.
The Red Baron

Richthofen and the all-red 425/17

The top-scoring ace of the war flew his last combats in a triplane.

Read the full account
Manfred von Richthofen was already the highest-scoring fighter pilot of the First World War when he took to the Fokker Dr.I. Leading his “Flying Circus”, he scored his final victories in the triplane and flew his most famous aircraft, the overall-red Dr.I 425/17. To this day the red triplane is the single image most people picture when they think of the 1914–18 air war.
21 April 1918

The death of the Red Baron

How Richthofen was shot down over the Somme is still debated.

Read the full account
On 21 April 1918 Richthofen chased a Canadian pilot low over the Morlancourt Ridge on the Somme and was hit by a single bullet through the chest. Credit for the kill was given to Canadian pilot Captain Roy Brown, but the angle of the fatal wound has convinced most historians that he was hit by ground fire from Australian machine-gunners. He managed a rough landing behind Allied lines and was found dead in the cockpit. He was 25, with 80 confirmed victories.
Grounded

The wings that fell off

A run of fatal accidents nearly ended the triplane’s career.

Read the full account
Soon after the Dr.I reached the squadrons, aircraft began losing their upper wings in flight. Two well-known pilots died in a matter of days in October 1917, and the entire type was grounded. The cause was traced to moisture and poor workmanship weakening the wooden wing structure; Fokker was forced to rebuild the wings before the triplane could fly again.
The Sopwith connection

Inspired by the enemy

The German triplane was a direct answer to a British one.

Read the full account
The Fokker Dr.I owed its very existence to the British Sopwith Triplane, whose climb and manoeuvrability impressed German pilots in early 1917. German industry was told to produce triplanes to match it, and Fokker’s answer — the Dr.I — reached the front just as the Sopwith that inspired it was being withdrawn.
Handling

A machine that turned like no other

The triplane’s agility was its whole reason for being.

Read the full account
Pilots described the Dr.I as light on the controls and able to turn inside almost any opponent. Its rotary engine’s gyroscopic effect made it whip around to the right, a trick expert dogfighters used to reverse a turn faster than an enemy could follow. It demanded skill — but in the right hands it was a superb close-in fighter.
Slow but deadly

Speed was never the point

The Dr.I fought in the vertical, not the straight line.

Read the full account
With a top speed of only around 185 km/h the triplane was slower than the Allied scouts it faced, and it could not catch a fleeing enemy or escape a diving one. Its pilots learned to fight in the vertical — climbing, zooming and turning — where the Dr.I’s agility mattered more than another aircraft’s speed.
Short career

A legend built in a matter of months

The Dr.I’s front-line life was surprisingly brief.

Read the full account
For all its fame, the Fokker Dr.I served on the front line for less than a year in any numbers, and only about 320 were built. By the summer of 1918 it was outclassed and being replaced by the faster Fokker D.VII. Its legend rests less on numbers than on the two aces who flew it and the unmistakable shape of its three wings.
The Flying Circus

Jagdgeschwader 1 and its painted triplanes

Richthofen’s wing turned bright paint into psychology.

Read the full account
Richthofen’s Jagdgeschwader 1 grouped four fighter squadrons that moved by rail to wherever the fighting was fiercest, living in tents beside their aircraft. Their vividly painted machines and travelling-show mobility earned them the Allied nickname “the Flying Circus”. The bright colours also helped pilots recognise each other in the chaos of a dogfight.
Snoopy

How a comic strip kept the triplane famous

The Dr.I flew on long after the war — in the funny pages.

Read the full account
Beyond the history books, the Fokker Dr.I found a second life in popular culture. In Charles Schulz’s Peanuts, the dog Snoopy imagines himself a First World War flying ace duelling the Red Baron in his triplane. For millions of readers, the shape of the three-winged Fokker — and the name of its most famous pilot — became household knowledge.
No survivors

Why every flying Dr.I is a replica

Not one genuine Fokker Dr.I remains airworthy.

Read the full account
No original Fokker Dr.I survives in flying condition today. A handful of relics and preserved airframes existed after the war, but the best-known survivors were destroyed — some in a museum lost to bombing in the Second World War. Every triplane you see flying at an air show, and most of those on museum floors, is a faithful modern reproduction.
Gallery

Fokker Dr.I photos: the Red Baron’s triplane, period and preserved

Captured German Fokker Dr.I Triplane, 1918
A German Fokker Dr.I captured by the U.S. Third Army. Photo: Air Service, United States Army, 1919 (public domain).
Manfred von Richthofen with a Fokker Dr.I
Manfred von Richthofen (the Red Baron) with a Fokker Dr.I, c.1918. Photo: unknown, c.1918 (public domain).
German Fokker Dr.I Triplane, 1918
A German Fokker Dr.I Triplane on the ground, 1918. Photo: Australian armed forces (public domain).
Fokker Dr.I Triplane of a German Jasta
A Fokker Dr.I of a German fighter squadron (Jagdstaffel) during the First World War. Photo: unknown, c.1917–18 (public domain).
Fokker Dr.I replica in Richthofen 425/17 markings
A Fokker Dr.I replica painted in the all-red markings of Richthofen’s aircraft 425/17. Photo: Todd Van Hoosear (CC BY-SA 2.0).
Fokker Dr.I Triplane replica at AERO 2018
A Fokker Dr.I replica displayed at AERO 2018, Friedrichshafen. Photo: Matti Blume (CC BY-SA 4.0).
Fokker Dr.I Triplane replica at the Omaka museum
A Fokker Dr.I replica in the “Knights of the Sky” exhibition at the Omaka Aviation Heritage Centre, New Zealand. Photo: Pseudopanax (public domain).
Watch

The Fokker Dr.I in the air: an airworthy triplane replica flies

Historical Aviation Film Unit · “The Red Baron’s Fokker Dr.1 Triplane” — a widely-viewed film from a respected vintage-aviation channel showing an airworthy Fokker Dr.I replica start up and fly.

Operations

Where the Fokker Dr.I flew: origin, combat use and surviving replicas

Combat Record

The Fokker Dr.I in combat: a short, storied front-line career

The Fokker Dr.I fought on the Western Front from late 1917 into 1918 in the hands of Germany’s best fighter pilots. It was never a war-winning weapon — it was slow, few were built, and its front-line career was short — but in expert hands it was a deadly close-in dogfighter, and it is forever tied to Werner Voss’s last stand and to Manfred von Richthofen, the top-scoring ace of the war. Victory and loss figures for individual aircraft and units vary between sources and should be treated as estimates.

80Confirmed victories by Richthofen, the war’s top ace
~320Fokker Dr.I aircraft built
1917–18Front-line service on the Western Front

Compare the Explore the combat record of every military aircraft. Data as of July 2026.

Questions & Answers

Fokker Dr.I Triplane: frequently asked questions

Can I fly in a Fokker Dr.I Triplane?
Not in any reliable, bookable way. No original Fokker Dr.I survives in airworthy condition — every flying triplane is a modern replica. A number of these replicas exist, and a few two-seat reproductions have occasionally offered joy-rides at air shows or through private owners, but there is no established company that reliably sells seats in a Dr.I to the public, and we won’t point you to one that doesn’t exist. If you want to actually fly in a real military aircraft, you can: MiGFlug has put civilians in genuine fighter-jet cockpits since 2004. See the current options at migflug.com/flights-prices/.
What is the Fokker Dr.I Triplane?
The Fokker Dr.I was a German single-seat fighter of the First World War, best known as the aircraft of Manfred von Richthofen, the “Red Baron”. Its name comes from Dreidecker (“triplane”), and its three stacked wings gave it exceptional climb and agility at the cost of speed. It flew from 1917 into 1918.
Why did the Fokker Dr.I have three wings?
Three stacked wings gave a large lifting area on a very short, light airframe, so the triplane could climb steeply and turn very tightly. The layout was inspired by the British Sopwith Triplane. The trade-off was extra drag and a low top speed of only about 185 km/h, slower than the Allied fighters it faced.
Who flew the Fokker Dr.I?
The two most famous Dr.I pilots were Manfred von Richthofen (the “Red Baron”), the top-scoring ace of the war with 80 victories, and Werner Voss, who fought a legendary lone dogfight against British S.E.5as in September 1917. Both flew the triplane with Germany’s elite fighter squadrons.
How did the Red Baron die?
Manfred von Richthofen was killed on 21 April 1918, flying his all-red Dr.I 425/17 low over the Somme. He was hit by a single bullet. Credit was given to Canadian pilot Captain Roy Brown, but most historians now believe he was struck by ground fire from Australian machine-gunners. He managed a rough landing behind Allied lines but was already dead or dying.
Why was the Fokker Dr.I grounded in 1917?
Soon after entering service, several Dr.Is lost their upper wings in flight, killing their pilots. The whole type was grounded and investigated. The cause was traced to moisture and poor workmanship weakening the wooden wing structure. Fokker was ordered to rebuild the wings, and modified aircraft returned to service around the end of 1917.
How many Fokker Dr.I were built?
Only about 320 Fokker Dr.Is were built, a small number by the standards of the war. It served on the front line for less than a year in any strength and was outclassed by mid-1918, when it was replaced by the faster Fokker D.VII. Exact production figures vary slightly between sources.
Are there any original Fokker Dr.I aircraft left?
No genuine original Fokker Dr.I survives in airworthy condition, and no complete original is known to survive at all — the best-known preserved examples were destroyed, including one lost to bombing in the Second World War. The triplanes seen flying and displayed today are faithful modern reproductions.
What engine did the Fokker Dr.I use?
Most Dr.Is used the Oberursel Ur.II, a nine-cylinder rotary engine of about 110 hp that was a copy of the French Le Rhône. In a rotary engine the whole cylinder block spins with the propeller. Some aircraft used captured or licence-built Le Rhône engines, which ran better than the German substitute-oil-fed Oberursels.
The part of the collection you can touch

You can’t fly the Fokker Dr.I.
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Sources

Fokker Dr.I: sources & further reading

Hero and gallery photography: U.S. Air Force / NASA, public domain. Combat statistics as of July 2026. Spotted an error? Every page in the Aircraft Museum is fact-checked before publication — write to us and we’ll correct it.