Fokker Dr.I

Updated: October 2026 – Three wings stacked on top of each other, a bright red paint job and a name almost everyone knows: the Fokker Dr.I is the aircraft of the “Red Baron” Manfred von Richthofen and thus the most famous fighter of World War I. Only around 320 were built, it was in service for barely a year, and not a single original has survived. Even so, you can still encounter the triplane today in museums and – with a bit of luck – even in the air, as a lovingly built replica. Here you will learn how the Dr.I came about, why its career was so short, how to identify it with confidence and where to see airworthy replicas.

What is the Fokker Dr.I?

The Dr.I is a single-seat fighter with three wings stacked on top of each other, built by the Fokker aircraft works in Schwerin. The company head was the Dutchman Anthony Fokker, who built aircraft in Germany for the air service during World War I. You will find the history of the company up to the later airliners on the page about the manufacturer Fokker.

The impetus came in 1917 from an opponent: the British Sopwith Triplane had stood out on the Western Front for its climb rate and agility, and Fokker wanted to offer something comparable quickly. His chief designer Reinhold Platz, however, did not copy the British aircraft but drew up a design of his own. Instead of many bracing wires, the triplane got cantilever wooden wings that drew their strength from heavy spars. The fuselage consisted of a welded steel-tube frame with fabric covering – a construction method in which Fokker was ahead of many competitors.

The first prototype was called V.4 internally, and the revised version V.5 got longer wings and balanced control surfaces. The first flight took place on July 5, 1917. The first two pre-production aircraft still ran under the designation F.I, the production series then as the Dr.I – “Dr” for Dreidecker (triplane).

Technology: small, light, extremely agile

At just under six meters in length and a good seven meters of wingspan, the Dr.I is astonishingly small. The three wings delivered a lot of lift on a small span, and the short fuselage made the aircraft very eager to turn. Pilots praised above all the agility and the climb rate in a turning fight.

The triplane was powered by an Oberursel Ur.II, a nine-cylinder rotary engine with around 110 hp. In this design the crankshaft is fixed, and the entire engine rotates together with its cylinders and the propeller. That gave good cooling but also a strong gyroscopic effect: the Dr.I turned in one direction much more willingly than in the other, which experienced pilots used deliberately. Lubrication was by castor oil in a total-loss system – some of it inevitably ended up on the aircraft and the pilot. The Ur.II was a German copy of the French Le Rhône 9J; a few Dr.I even flew with captured Le Rhône engines.

The weaknesses showed quickly. The triplane was slower than most Allied fighters of 1918, and the rotary engine lost a lot of power at high altitude. On top of that, from 1918 there was inferior substitute lubricating oil, which led to engine trouble. The Dr.I was armed with two synchronized machine guns firing through the propeller arc.

Wing failures and the flying ban

Barely at the front, the triplane made headlines. In October 1917, two pilots, Heinrich Gontermann and Günther Pastor, were killed in crashes after wing parts came loose in the air. The air service inspectorate responded on November 2, 1917 with a flying ban. Investigations blamed mainly poor workmanship and moisture getting in, which weakened the wood of the wings.

After reinforcements the Dr.I was allowed to fly again at the end of November, but it only reached the front in larger numbers in spring 1918. The problems never quite went away: in March 1918, Lothar von Richthofen, the Red Baron’s brother, was seriously injured after a failure of the upper wing. Later investigations in the USA showed that the upper wing was aerodynamically loaded more heavily than the lower ones – a point that had been underestimated in the design.

Production ended in May 1918. The triplane reached its highest frontline strength at the end of April 1918, with around 170 aircraft. Already in June and July 1918, the faster Fokker D.VII replaced it.

The Red Baron and other aces

That an aircraft with such a short career is world-famous to this day is down to its pilots. Manfred von Richthofen flew one of the pre-production aircraft from late August 1917 and scored his first triplane victories in it in early September. As commander of Jagdgeschwader I – known to the Allies as the “Flying Circus” because of the colorful paint and frequent relocations – he scored his last aerial victories in the triplane. With officially 80 kills he was the most successful fighter ace of the war.

On April 21, 1918, Richthofen fell in his red Dr.I 425/17, which came down in a field north of Vaux-sur-Somme. The Royal Air Force initially credited the kill to the Canadian pilot Roy Brown; today many historians assume he was hit by a shot from the ground. The aircraft was quickly taken apart by souvenir hunters. The engine is today at the Imperial War Museum in London, and other parts are spread across collections in Canada and Australia.

Other names are also closely tied to the triplane:

• Werner Voss flew the pre-production aircraft F.I 103/17 with a painted face on the cowling. He fell on September 23, 1917, after a legendary dogfight against several pilots of the British No. 56 Squadron.
• Kurt Wolff was shot down in the second pre-production aircraft, 102/17.
• Josef Jacobs scored around 30 of his aerial victories in the triplane and flew a black-painted aircraft.

The three features that are enough to identify it

A replica with a radial engine often looks a bit rounder and wider at the front than the original, because the star of cylinders sits differently behind the cowling. You can hear the difference too: a real rotary engine crackles more irregularly and is often “blipped” by interrupting the ignition for landing. How to tell engines apart by sound is shown in Identifying aircraft types by sound.

Triplane, biplane or Sopwith?

At vintage meets, World War I replicas often stand next to later trainer and aerobatic biplanes. The finder helps narrow it down.

The de Havilland DH.82 Tiger Moth and the Bücker Bü 133 Jungmeister are the biplanes you most often see next to World War I replicas at vintage meets. Both date from the 1930s and have a fixed vertical fin. If you want to sharpen your eye for historic types, you will find more in Identifying vintage aircraft in the sky.

No originals, but many replicas

A few triplanes outlasted the war, but none survives. The 528/17 later served at Adlershof as a test aircraft and for film shoots and was probably lost in a crash at the end of the 1930s. The 152/17, in which Richthofen had scored several aerial victories, stood in the Berlin Zeughaus and was destroyed in an air raid in World War II – as was a triplane that Fokker had assembled from existing parts in 1932. Only individual components survive.

All the larger is the world of replicas. They range from exact museum copies to airworthy aircraft that hobby builders put together from kits or plans. Well-known homebuilt versions include the designs from Airdrome, Redfern and Sands. Because original rotary engines are rare and expensive, most replicas fly with radial engines from Warner or Continental. Only a few replicas have a real Le Rhône 9J or a reproduced Oberursel engine.

Static replicas in museums

• The Deutsches Museum in Munich shows a replica in the colors in which Richthofen set out on his last flight. Check before your visit whether the exhibit is currently on display.
• The phanTechnikum in Wismar also has a replica.
• More triplane replicas turn up again and again in collections and special exhibitions. Houses with a focus on early aviation, such as the Aviodrome in Lelystad, which shows Dutch Fokker history, or the Technik Museum Sinsheim, are worth a look at the current exhibition list – we do not guarantee a triplane there.

If you want to see German military aviation in context, plan a visit to the Military History Museum Berlin-Gatow; tips for photographers on the grounds are in the spot Luftwaffe Museum Berlin-Gatow.

Flying replicas

Most airworthy triplanes are in Great Britain and the USA. In the United States, Old Rhinebeck Aerodrome in New York State is well known, where a replica with a rotary engine is part of the collection. In Great Britain, World War I replicas fly at warbird and vintage events, for example at the Duxford airshows at the Imperial War Museum Duxford or at the flying days of the Shuttleworth Collection in Old Warden (spot info). A fixed triplane appearance is not guaranteed there – the program changes from year to year.

In Germany, flying triplanes are a true rarity. At the ILA in Berlin, an airworthy replica was on show in 2004. Whether a World War I replica takes part in vintage meets such as Hahnweide is revealed only by the current program. Which shows in Europe display historic aircraft at all is collected in Airshows in Europe. Airworthy replicas are civil-registered; what a German registration tells you about weight class and certification is explained in German aircraft registrations.

Photo tips especially for the Dr.I

The triplane flies slowly, tightly and low – that makes it a rewarding photo subject, but also a tricky one.

How rare a triplane is in your collection, you can judge with How to judge the rarity of a sighting: A flying replica clearly counts among the rarities in Central Europe.

Common mix-ups and how to rule them out

Later fighters like the Hawker Hurricane or the Supermarine Spitfire show how quickly fighter design developed after 1918 from the multiplane to the all-metal monoplane. At Fokker itself, the road after the war led to the Netherlands and to airliners – all the way to the Fokker F27 Friendship. A German contemporary from commercial aviation is the Junkers F 13, which flew as an all-metal aircraft as early as 1919.

Conclusion

Technically, the Fokker Dr.I was not a design for the ages: too slow, with delicate wings and an engine that faded at altitude. It owes its place in history to its agility in a turning fight and above all to Manfred von Richthofen. Because no original has survived, every triplane you see today is a replica – and a flying one is a sighting in Central Europe that stands out in your hangar.