The Gauntlet was the product of years of patient refinement rather than a single clean-sheet design. Through the 1920s Gloster and its chief designer Henry Folland built a succession of experimental single-seat fighters — among them the SS.18 and SS.19 — testing different engines, gun fits and aerodynamic details in the search for extra speed.

The breakthrough came with the fitting of the supercharged Bristol Mercury radial and a series of drag-reducing refinements. The resulting aircraft, ordered by the Air Ministry, became the Gauntlet. It was a conventional biplane in layout, but a carefully optimised one, and it gave the RAF a worthwhile jump in performance over the Bulldog.

In that sense the Gauntlet was the near-final flowering of the Gloster biplane fighter line. Only one step remained — the enclosed-cockpit, four-gun Gladiator — before the whole biplane tradition was rendered obsolete by the monoplane.

The Gauntlet entered service in 1935 as the RAF’s fastest fighter, but the ground was already shifting beneath it. Within a year or two the monoplane fighters were arriving: the Hurricane first flew in 1935 and the Spitfire in 1936, and both were around a hundred miles an hour faster, with retractable undercarriages, enclosed cockpits and eight guns.

A biplane’s two wings and bracing wires create drag that caps its speed no matter how much engine power is available. The Gauntlet had squeezed close to the practical limit of the layout; there was simply nowhere left to go. Even its own successor, the Gladiator, could only add a canopy and two more guns, not break the speed barrier.

So the Gauntlet’s moment at the top was brief. What it retained was the biplane’s traditional virtue — superb agility — and a reputation as one of the nicest aircraft of its day to fly. But as a front-line fighter it was overtaken almost as soon as it had arrived.

In the 1930s the RAF’s annual Hendon Display was a national spectacle, and the Gauntlet was one of its stars. Squadrons such as No. 19 and No. 25 flew close-formation aerobatics — loops and rolls performed in tight groups, sometimes with the aircraft literally tied together with light cords to demonstrate the precision of the formation.

These displays were widely filmed by the newsreel companies, and footage of Gauntlets looping and rolling in formation reached cinema audiences across Britain. The aircraft’s light, responsive handling made it ideal for the role, and for many members of the public the Gauntlet was the visible symbol of a modern, expanding air force.

It was a fitting swansong for the biplane fighter. Within a few years the display teams would be flying monoplanes, and the open-cockpit formation aerobatics of the Gauntlet era would belong to a vanished age.

The two main RAF marks were the Gauntlet Mk I and the improved Mk II. The Mk I came from the original production contract; the Mk II introduced a modified structure using Hawker-style construction methods after Gloster became part of the Hawker Siddeley group, along with detail improvements. In the air the two were very similar.

Abroad, Denmark built Gauntlets under licence at its Army Aircraft Factory, and export and second-hand aircraft reached Finland, South Africa, Southern Rhodesia and Australia. Total production is usually given as around 230 aircraft including the Danish licence machines and prototypes, though the exact figure varies between sources depending on how prototypes and conversions are counted.

Reliable unit and running costs for the Gauntlet in the 1930s are not well recorded in the public sources, and any single figure should be treated with caution. As a fabric-and-metal biplane with a single radial engine it was a relatively cheap fighter by the standards of the day — far less costly than the all-metal monoplanes that soon replaced it.

The only meaningful modern benchmark is what it costs to keep a vintage warbird of this kind flying. A hand-built radial engine, fabric covering and irreplaceable parts mean that operating such an aircraft is commonly estimated at several thousand pounds per flying hour once maintenance, insurance and engineering are included — but that is an estimate for a preserved aircraft, not an interwar cost.

For a visitor the practical point is simple: you cannot buy a seat in a Gauntlet at any price. It is a single-seat fighter and the survivors are irreplaceable museum pieces. What you can do is fly in a genuine military jet instead — which is exactly what MiGFlug offers.

The Gauntlet was built around the Bristol Mercury, a nine-cylinder air-cooled radial that was one of the most important British aero engines of the 1930s. In the Gauntlet it produced roughly 640 horsepower, and its supercharger helped the light biplane to a top speed a little over 230 mph — fast for its day.

The Mercury was famously reliable and was built in large numbers, powering aircraft from the Gauntlet and Gladiator to the Bristol Blenheim bomber. Air-cooled and rugged, it needed no vulnerable radiator and could operate in climates from northern winters to the desert.

That dependable radial was central to the Gauntlet’s character. It gave a modest, elegant airframe a genuinely lively performance, and it linked the Gauntlet to a whole family of RAF aircraft that would carry the same engine into the Second World War.

Like many RAF fighters of its era, the Gauntlet took a suitably martial name — a gauntlet being the armoured glove of a knight, and “throwing down the gauntlet” a challenge to combat. It fitted the aggressive single-seat fighter well, and set a pattern of “G” names that Gloster continued with the Gladiator.

Its lineage ran directly forward as well as back. The Gladiator that followed it was essentially a developed Gauntlet with an enclosed cockpit and four guns, so the two aircraft are best understood as a pair — the open-cockpit original and its enclosed successor, the last two biplane fighters the RAF ever used.

That makes the Gauntlet a genuine hinge in RAF history: the last open-cockpit fighter, the immediate ancestor of the Gladiator, and one of the last of a biplane tradition that reached back to the First World War.

When the Gauntlet reached No. 19 Squadron in 1935 it gave the RAF a real jump in performance. At around 230 mph it was some 50 mph faster than the Bristol Bulldog it replaced, and for roughly two years it was the fastest fighter in British service.

That lead was quickly overtaken. The Hawker Hurricane, which first flew in 1935, was around a hundred miles an hour faster, and the Spitfire faster still. The Gauntlet’s spell at the top was a brief high point at the very end of the biplane era.

But it was a genuine one. For a short time the elegant open-cockpit Gauntlet, not a sleek monoplane, was the quickest thing the RAF could put into the air — a fact that surprises many people today.

The Gauntlet’s agility made it a natural for the RAF’s public displays. At Hendon in the mid-1930s, Gauntlet squadrons flew formation aerobatics of a precision that astonished crowds — loops and rolls carried out in tight groups, sometimes with the aircraft tied together with light cords.

These set-pieces were filmed by the newsreel companies and shown in cinemas across the country, making the Gauntlet one of the most visible symbols of Britain’s expanding air force in the years before the war.

It was the last hurrah of the biplane display. Within a few years the RAF’s show aircraft would be monoplanes, and the open-cockpit formation aerobatics of the Gauntlet era would be a memory.

One of the Gauntlet’s more intriguing claims to fame belongs to the story of air defence. During the late-1930s experiments that developed radar and ground control, a Gauntlet is widely reported to have been directed onto its target — an aircraft it could not initially see — by controllers using early radar plots.

This is often cited as one of the first successful ground-controlled interceptions, the technique that, refined into the Dowding System, would prove decisive in the Battle of Britain. Accounts differ on the precise date and details, so the episode is best treated as a well-known but imperfectly documented story.

Whatever the exact circumstances, it is a striking image: an obsolescent open-cockpit biplane taking part in the birth of the modern, radar-directed air defence that would soon make it, and every other biplane fighter, redundant.

The point of those experiments was never the aircraft but the system — the chain of radar station, plotting room, controller and fighter that could put an interceptor in the right piece of sky before the enemy arrived. That the aircraft at the end of the chain, on at least one celebrated occasion, was a Gauntlet is a small but genuine part of how the RAF learned to fight the coming war.

Finland acquired Gauntlets in the late 1930s, and when the Soviet Union attacked in the Winter War of 1939–40 the type was pressed into service. By then it was thoroughly obsolete as a fighter, and the Finns used their Gauntlets mainly for reconnaissance, liaison and training.

Operating in extreme cold from rough strips and frozen surfaces, the Gauntlets did useful, unglamorous work during Finland’s desperate defence. A few remained in use into the Continuation War that followed.

It is thanks partly to this Finnish service that a Gauntlet survives today: the Finnish aviation-museum aircraft (GT-400) is one of the very few complete examples left in the world.

Denmark thought highly enough of the Gauntlet to build it under licence. The Danish Army Aircraft Factory manufactured a batch of Gauntlets for the Army Aviation Troops — an unusual undertaking for a small air arm and a real compliment to the design.

The Danish Gauntlets equipped a fighter squadron and took part in the country’s modest interwar air defence. Their service ended abruptly with the German occupation of Denmark in April 1940.

Danish licence production is one reason the usual production total of around 230 aircraft should be treated with care — different sources count the Danish machines, prototypes and conversions in different ways.

A number of Gauntlets were still in service overseas when the Second World War began, and some saw genuine action. In the East African campaign of 1940–41, Gauntlets flown by RAF, South African and Southern Rhodesian-manned units carried out army-cooperation and light attack sorties against Italian forces.

Operating in heat, dust and over great distances, the rugged air-cooled Gauntlet did work that more sophisticated fighters would have struggled to sustain in such conditions. Others served in the wider Middle East in the war’s early years.

These were marginal operations by an obsolete aircraft, but they meant that the Gauntlet — a fighter designed for the peacetime RAF of the early 1930s — actually fired its guns in anger in the Second World War.

The Gauntlet carried two synchronised .303-inch Vickers machine guns, mounted in the fuselage and firing through the propeller arc. This was the armament the RAF had used since 1918, and against the fabric-covered aircraft of the early 1930s it was considered adequate.

The very next generation of fighters transformed the picture. The Gladiator doubled the battery to four guns, and the Hurricane and Spitfire quadrupled it to eight. Against armoured monoplanes, two rifle-calibre guns were no longer enough.

So the Gauntlet was, in effect, the last RAF fighter of the classic two-gun type — another way in which it marks the end of one era of air fighting and the start of another.

The Gauntlet Mk II had a top speed of about 230 mph (370 km/h). In 1935 that made it the fastest fighter in the RAF, a genuinely impressive figure for an open-cockpit biplane.

By the standards of just a few years later it was slow. The monoplane fighters that followed exceeded 320 mph and could out-climb and out-dive the Gauntlet comfortably. The biplane’s twin wings and bracing wires simply could not be pushed much faster.

What the Gauntlet had instead was agility, and a reputation as a beautiful aircraft to fly. Its speed was a brief triumph; its handling was a lasting one, remembered fondly by the pilots who flew it.

It is worth remembering, too, that “fast” is always relative to its moment. In 1935 the Gauntlet’s 230 mph was genuinely at the front of the field; it was only the extraordinary leap of the monoplane a year or two later that made the same figure look pedestrian. The aircraft did not get slower — the world got faster.

The Gauntlet and Gladiator are best understood together. The Gladiator was developed directly from the Gauntlet, keeping the same broad configuration but adding an enclosed sliding cockpit, four guns instead of two, and other refinements.

In effect the Gauntlet is the open-cockpit ancestor and the Gladiator its enclosed successor — the last two biplane fighters the RAF ever operated, one after the other. The Gladiator went on to war fame over Norway and Malta; the Gauntlet, a little older, mostly did not.

Understanding the Gauntlet as the Gladiator’s immediate predecessor is the key to its place in history — and it is why the two aircraft so often appear together in accounts of the RAF’s last biplane fighters.

The Gauntlet’s front-line career was short. From 1937 onward its squadrons began to re-equip with the Gladiator and then the monoplane Hurricane, and by the outbreak of war in 1939 it had largely left first-line fighter service in Britain.

It did not vanish, though. Surviving aircraft passed to training and communications units, to overseas commands, and to the export operators who kept them flying a little longer. The last examples served until about 1943.

Its retirement was the natural end of a design that had been overtaken by the monoplane revolution almost as soon as it peaked. But by then the Gauntlet had already earned its modest, genuine place in the RAF’s story.

The Gauntlet’s problem was timing. It was designed in the era when the biplane fighter still made sense and reached its peak just as the monoplane came of age. By 1939 it was comprehensively outclassed by the Hurricanes and Spitfires entering service.

A biplane’s drag caps its speed, and the Gauntlet had already been pushed close to the limit of the layout. There was no way to make it competitive with an aircraft a hundred miles an hour faster, carrying four times the guns.

That it still saw some wartime service in secondary theatres says more about how short the RAF was of aircraft in 1940 than about the Gauntlet’s fighting value by then.

The lesson of the Gauntlet is really a lesson about the pace of 1930s aviation. An aircraft could be the best of its kind and the fastest in its air force, and yet be effectively obsolete within three or four years, simply because the whole basis of fighter design had changed underneath it.

The Gauntlet replaced the Bristol Bulldog, the RAF’s standard fighter of the early 1930s, and the contrast shows how fast performance was climbing. The Gauntlet was around 50 mph faster, at roughly 230 mph against the Bulldog’s 178, while keeping the same two-gun armament.

Both were open-cockpit biplanes, but the Gauntlet’s more powerful, supercharged Mercury and cleaner design gave it a decisive edge in speed and climb. To a pilot moving from one to the other it was a noticeable step up.

The two aircraft together frame the mid-1930s RAF fighter story: the Bulldog the workhorse of the early decade, the Gauntlet its faster successor — and both about to be swept aside by the monoplane.

Set beside the Hurricane and Spitfire, the Gauntlet belongs to a different age. Where it was an open-cockpit, fixed-undercarriage biplane with two guns and a top speed of 230 mph, the monoplanes had enclosed cockpits, retractable gear, eight guns and speeds well above 320 mph.

The gap was not one of degree but of kind. The monoplane broke the speed ceiling the biplane could never pass, and it did so while carrying four times the firepower. Nothing about the Gauntlet’s layout could answer that.

This is why the Gauntlet’s front-line life was so short. It was not a bad fighter; it was simply the finest example of a type that had just been made obsolete.

The Gauntlet was one of the last biplane fighters Gloster built, followed only by the Gladiator. But the company’s story did not end with biplanes: within a decade Gloster would build Britain’s first operational jet fighter, the Meteor.

That leap — from the open-cockpit Gauntlet to the jet-powered Meteor in little more than ten years — captures the astonishing pace of aviation in the 1930s and 1940s. The Gauntlet sits near the start of that arc, at the last moment of the biplane.

So the Gauntlet’s significance is partly as a marker: the RAF’s last open-cockpit fighter, from a company that would soon help usher in the jet age.

Production of the Gauntlet is usually given as around 230 aircraft, a total that includes the two RAF marks, the Danish licence-built machines and the prototypes — but the exact figure varies between sources depending on how prototypes, conversions and licence aircraft are counted.

The great majority served with the RAF, equipping a large slice of Fighter Command in the mid-1930s. A smaller number went to export operators or were built abroad under licence in Denmark.

Whatever the precise total, the Gauntlet was built in modest numbers compared with the monoplanes that followed — the Hurricane and Spitfire ran to many thousands each. It was the last of a smaller, older kind of fighter.

Those modest numbers, and the type’s short front-line life, are also why so few Gauntlets survive today. Most were scrapped or lost in second-line and overseas service, leaving only a tiny handful of complete aircraft for later generations to preserve.

The Gauntlet’s pilot sat in an open cockpit behind a small windscreen, exposed to the freezing slipstream as fighter pilots had been since the First World War. Ahead of him was a simple instrument panel, a control column, rudder pedals and the firing controls for the two guns.

It was a fighter of its time in every respect: no armour, no self-sealing tanks, a fixed undercarriage and a hand-swung or cartridge-started radial engine. But it was light, well balanced and honest, and pilots found it a genuine pleasure to handle.

That open cockpit is one of the Gauntlet’s defining features. It was the last RAF fighter without a canopy — its successor, the Gladiator, enclosed the pilot for the first time.

The Gauntlet’s two .303-inch Vickers machine guns were mounted in the fuselage and synchronised to fire through the propeller arc. Aiming was through a simple ring-and-bead or reflector sight of the period.

Two rifle-calibre guns were the RAF standard set in 1918, and against the aircraft of the early 1930s they were considered enough. The short firing time and light calibre would soon be exposed, but in the Gauntlet’s heyday they were normal.

It was the last RAF fighter built to that old two-gun standard. Everything after it carried more — the Gladiator four guns, the Hurricane and Spitfire eight — as air combat moved decisively on.

Once withdrawn from front-line fighter units, the Gauntlet found a useful afterlife. Surviving aircraft served as trainers, communications hacks and station aircraft, their gentle handling making them well suited to the work.

Overseas, Gauntlets lingered longer than in Britain, and it was often these second-line and export aircraft that saw the type’s only real wartime action, in East Africa and the Middle East.

It is the common fate of an obsolescent design: retired from combat, it soldiers on in the quiet, essential jobs that keep an air force running. The Gauntlet did so until the last examples were retired around 1943.

The Gauntlet is far rarer in preservation than its Gladiator successor. Only a handful of examples and rebuilds survive anywhere in the world, which makes any encounter with one a genuine rarity.

The best-known complete survivor is the Finnish museum aircraft GT-400 (registered OH-XGT), preserved by an aviation-museum collection in Finland and, for a time, flown in Finnish Air Force markings; a United Kingdom example has also been restored and displayed. Airworthiness of the surviving aircraft has varied over the years, so any “flying Gauntlet” claim should be checked against the aircraft’s current status.

Whether flying or static, these few aircraft are single-seat museum pieces. You can hope to see a Gauntlet at a museum or, very occasionally, an airshow — but you cannot book a seat in one.

For anyone who wants to go beyond looking, the honest answer is the same one this page gives throughout: the way to actually fly in a piece of military-aviation history is a genuine two-seat military jet, which is exactly what MiGFlug offers — not a ride in an irreplaceable single-seat 1930s biplane.

The Gauntlet did not appear from nowhere. It was the end product of a Gloster development programme that ran through the late 1920s and early 1930s under Henry Folland, built around a series of experimental single-seat fighters designated SS.18 and SS.19.

These aircraft were repeatedly re-engined and reworked — different radial engines, different gun fits, aerodynamic tidying — as Gloster chased the extra speed the Air Ministry wanted. The prototype J9125 passed through several forms, including the SS.19A and the Mercury-powered SS.19B.

It was the SS.19B that finally offered the performance jump worth ordering, and it entered production as the Gauntlet. The type’s untidy, experimental origins are the reason its early history can be confusing — it was an evolution, not a single design.

The single most important ingredient in the Gauntlet’s success was its engine. The supercharged Bristol Mercury radial gave roughly 640 horsepower and, crucially, held its power up to altitude, which is where the Gauntlet’s speed advantage over the Bulldog was most marked.

The Mercury was a robust, widely produced engine, and fitting it to a clean, light airframe was what turned a promising experimental fighter into the fastest aircraft in the RAF. The same engine family would go on to power the Gladiator and the Blenheim.

For all the Gauntlet’s traditional biplane layout, then, its heart was thoroughly modern for 1935 — a reliable, supercharged radial that briefly put an open-cockpit biplane at the top of the RAF’s performance table.

The two production marks differed mainly in construction rather than performance. The Mk I came from the original contract and used Gloster’s own methods. After Gloster became part of the Hawker Siddeley group, the Mk II adopted Hawker-style construction techniques, along with detail improvements.

In the air the two were very similar, with the same Mercury engine, the same two-gun armament and much the same performance. Many Mk I aircraft also remained in service alongside the later machines.

The distinction matters mostly to historians and modellers; to a 1930s squadron pilot, a Gauntlet was a Gauntlet — a fast, delightful biplane whichever mark it happened to be.

Denmark was the only country to build the Gauntlet under licence. The Danish Army Aircraft Factory produced a batch for the Army Aviation Troops, equipping a fighter squadron in the country’s modest interwar air defence.

The Danish Gauntlets were a genuine mark of the type’s standing: it was unusual for a small air arm to invest in licence production of a foreign fighter. They served through the late 1930s until the German invasion of Denmark in April 1940 ended their career at a stroke.

This Danish chapter is one reason the usual production figure of around 230 aircraft should be treated with care — sources count the licence machines in different ways.

Beyond the RAF and Denmark, the Gauntlet reached several air forces of the British world. Finland flew it in the Winter War; South Africa and Southern Rhodesian-manned units took it to war in East Africa; and a small number served with the Royal Australian Air Force.

For a fighter with such a short front-line life in Britain, that is a respectable spread. It reflected both the Gauntlet’s good reputation and the way surplus RAF aircraft found second careers across the Empire and beyond as newer types arrived at home.

It also means that when the Gauntlet finally saw combat, it did so in the hands of several different nations, in theatres its designers in early-1930s Gloucestershire could never have imagined.

By all accounts the Gauntlet was a joy to fly. Pilots praised its light, responsive controls, its crisp handling and its willingness to aerobat — qualities that came from the low wing loading of a well-designed biplane.

The open cockpit meant cold, noise and wind, but it also gave superb visibility and the visceral sense of flight that later, enclosed fighters muted. For the display pilots of the mid-1930s it was close to ideal.

That reputation as a pilot’s aeroplane is a large part of why the Gauntlet is remembered so fondly by those who knew it, even though its front-line career was brief and it fought no great battles.

The Gauntlet’s service life coincided almost exactly with the monoplane revolution. It entered service in 1935, the year the Hurricane first flew; by the time the Spitfire reached squadrons, the Gauntlet was already being pushed aside.

The change was fundamental. Retractable undercarriages, enclosed cockpits, stressed-skin monoplane wings and eight-gun batteries together produced fighters that were faster, better armed and better protected than any biplane could be. The Gauntlet had no answer.

Its role in that story is as the last of the old order — the final open-cockpit fighter to hold the RAF’s front line before the monoplanes swept everything before them.

The Gauntlet is overshadowed by the aircraft around it — the war-famous Gladiator that followed, the Hurricane and Spitfire that replaced it. It fought no Battle of Britain and defended no Malta, and so it slips out of the popular story.

Yet its list of distinctions is real: the RAF’s fastest fighter for around two years, its last open-cockpit fighter, its last two-gun fighter, the direct ancestor of the Gladiator, and a participant in the birth of radar interception. Few aircraft sit so exactly on the turn of an era.

To understand how the RAF crossed from the biplane age into the monoplane war, the Gauntlet is exactly the aircraft to look at — which is why it deserves a place in the story of its own.

There is also something quietly appealing about the aircraft itself: an elegant, open-cockpit biplane, loved by its pilots, thrilling the crowds at Hendon, and then bowing out gracefully as the machines that made it obsolete took over. It is the kind of aircraft that rewards a second look — a small, near-forgotten hinge in the history of air power.