Why German Engineers Had No Answer for the RAF Fighter That Killed Their V1 Bomb

On the morning of the 13th of June, 1944, people in the east end of London heard something they had never heard before. A hard flat buzzing like a motorcycle with no silencer coming out of the sky. Then the buzzing stopped. What followed was silence. About 12 seconds of it, long enough to look up.

Long enough to understand. Then Grove Road came apart and six people were dead. The thing that killed them had no pilot. It had a body of welded sheet steel, wings of plywood, and an engine so crude it contained no rotating parts at all. Only a bank of steel shutters that slammed open and shut 50 times every second.

German engineers had designed it to fly at a speed no British fighter could match. They had not guessed at that number. They had calculated it from real intelligence, from measured performance figures, and their calculation was correct. By the end of that summer, one Royal Air Force wing flying fewer than 30 propeller-driven aircraft off a grass strip in Kent had destroyed 638 of those bombs.

Roughly one out of every three brought down by any Allied fighter anywhere. The men who built the flying bomb never worked out how it was being done. The aircraft doing it did not appear in their files. It had been designed to fix a completely different problem 3 years earlier, and nobody in Germany had any reason to notice. The railway bridge on Grove Road carried the line east out of Bow.

A little after half 4 in the morning, the street beneath it was empty, the way any street is empty at that hour, and the blackout curtains in the terrace houses were still drawn tight against a sky that was only beginning to go gray. The people who lived through it remembered the sound before anything else. It was not an aircraft engine.

Aircraft engines rose and fell. They had a note you could follow across the sky. And after four years of war, the people of East London could tell a bomber from a fighter with their eyes closed and their heads under a blanket. This was something else. It was flat and hard and mechanical, a ripping, spitting buzz that never changed pitch, that did not sound as though it were attached to anything human at all. Then it stopped.

That was the part nobody was ready for. The engine simply cut and the sky over the east end went silent. And in that silence, a great many people did a piece of arithmetic without knowing they were doing it. There were about 12 seconds. Long enough to sit up in bed, long enough to reach across for a child, not long enough to get down the stairs.

The bridge took most of the blast. Six people were killed and more than 40 were injured. 12 houses came down into the street and dozens more were wrecked along Antill Road and the turnings around it. And by the time the first ambulances arrived, the Air Ministry already understood that the weapon its intelligence officers had been arguing about for more than a year, was real, and was here, and had no intention of stopping.

Within a week, the pattern had set. They came at all hours in ones and twos and sometimes in whole ragged streams crossing the coast between beachy head and the northland at around 2,500 ft holding a course as straight as a ruled line because a straight line was all they knew how to fly. The Royal Observer Corps gave them a code word diver.

When a plotter on the Kent coast called diver into a telephone, everything in the south of England that could shoot turned to face the sea and almost nothing could reach them. That was the arithmetic the air ministry could not get around in those first days. The Spitfire, the aircraft that had saved the country four years earlier, was simply too slow down near the water.

The Mustang did its best work high up where the thin air suited it and lost its advantage as it came down. The mosquito took the night shift and did what it could in the dark. Squadrons scrambled, chased, closed the distance by yards, and then watched the gap open again, and came home to Kent with full ammunition and empty tanks, while the thing they had been chasing went on toward London at 400 m an hour without a pilot, without fear, and without the slightest interest in what was behind it.

Somewhere in that same fortnight on a grass airfield on Romney Marsh, a pilot of 24 was learning to sit in a cockpit in total darkness. Every light in the office had been taped over or dimmed to almost nothing. His night vision took 30 minutes to build and about half a second to destroy. The thing he was learning to hunt announced itself with a jet of orange flame roughly 10 ft long, punching out of the back of the bomb 50 times a second.

And that flame was the only aiming mark he had. It was also the one thing guaranteed to blind him at the moment he most needed to see. He will have a name later in this story. For now, hold him there in the dark. Because to understand why he had an aircraft capable of catching that flame at all, you have to go backwards 3 years to an English drawing office and to a failure that had nothing whatsoever to do with flying bombs.

The man at the center of it was Sydney Cam, chief designer at Hawker Aircraft. He had already given the Royal Air Force the Hurricane, and in the summer of 1940, that had mattered a very great deal. What came next mattered rather differently. The Hawker Typhoon was meant to be the Hurricane’s successor, a high alitude interceptor, something that could climb up and dominate anything the Luftvafa put over England at medium and high level.

From the day it reached the squadrons, it began trying to kill the men who flew it. The engine was the first problem. The Napier Saber was on paper an extraordinary machine. 24 cylinders arranged in an H configuration. Two flat banks of 12 stacked one above the other on twin crankshafts producing somewhere around 2,180 horsepower at a time when most fighter engines were struggling past 1500.

In practice, the early production units ran rough, failed without warning, and sometimes caught fire. But the engine was only where the trouble started. Exhaust gases were leaking past faulty seals into the cockpit, mixing with the recirculated air, and quietly poisoning pilots with carbon monoxide across the length of an operational sorty.

Men flew entire missions feeling steadily and inexplicably wrong. landed and never understood why. Rear fuselage sections were failing in high-speed dives. Tail assemblies had come away in flight, taking pilots down with no warning and no time and nothing to report on the radio. The Royal Air Force convened accident investigation committees.

Inside the Air Ministry, there were serious conversations about cancelling the program outright. One stubborn characteristic saved it. Down low, below about 10,000 ft, the Typhoon was faster than anything the Germans could send up to intercept it. So, the aircraft built to be a high alitude interceptor found its real trade in the mud.

Ground attack, tank busting, railway strikes, anti-shipping work. Eventually, the rocket attacks that would make its name in Normandy. Not what it was designed for, not glamorous, and not what anyone had promised, but useful enough to justify keeping the production line open. Cam, watching all of this, understood the structural cause of the high-speed trouble, and it was not the engine at all. It was the wing.

The typhoon’s wing was thick. Its cross-section at the root represented about 18% of the cord, which is the distance from the leading edge to the trailing edge. That thickness was deliberate. It gave the internal structure room for fuel, for guns, for undercarriage attachment points, for all the things that have to go somewhere.

It also created a serious aerodynamic liability at speed. When a wing moves fast enough, the air flowing over its upper surface accelerates. Over a thick wing, it accelerates a great deal, and it can reach the local speed of sound while the aircraft itself is nowhere near it. When that happens, a shock wave forms sitting on the wing.

And a shock wave on a wing produces violent buffeting, a collapse of control authority, and under extreme conditions, structural failure. Typhoon pilots met it as a sudden hammering through the airframe, somewhere above roughly 450 m an hour in a dive. The faster you went, the less say you had in what happened next. In 1941, CAM proposed the cure.

A new wing semi-eleptical in plan trimmed from 18% thickness at the route down to about 14 12. Thinner air disturbance, later shock formation, and a pilot in a hard dive at 500 m an hour who could still fly his aeroplane. The thinner section also meant less drag, which meant more speed in level flight for the same power. The cost was volume.

A thinner wing cannot hold as much fuel, so Hawker moved the fuel forward into a lengthened fuselage, and the longer nose improved directional stability as a side effect. By the time the drawings were finished, the aircraft was different enough from the Typhoon that the Air Ministry gave it a new name, Tempest.

Now, hold that date. 1941, an English drawing office, a wing revision intended to fix a dive problem on an unpopular fighter. Because on the 27th of February, 1942 in Germany, two engineers sat down together and sketched out something entirely unrelated. One was Robert Lucer, who had moved from Hankl to the Feistler Aircraft Company.

The other was Fritz Goslau of Argus Mtorin. What they drew was a pilotless flying bomb. On the 5th of June 1942, Luster submitted the formal specification to the Luftvafa technical office. A fuselage of welded sheet steel, wings of plywood, an Argus pulse jet mounted above the rear fuselage, a warhead of 850 kg of aml explosive, guidance by gyrompus autopilot with a small propeller on the nose counting off the air miles traveled and cutting the engine at the programmed distance, sending the weapon into its final dive and a cruise speed of around

700 km an That number was not ambition. It was not a wish. It was the product of careful, honest technical work calculated from real and verified intelligence about what Royal Air Force fighters could actually achieve in 1942. And in 1942, no British fighter in service could hold 400 m an hour in sustained level flight down near the deck. The Spitfire could not do it.

The Typhoon had the power and was still fighting its thick wing and its own mechanical catalog of disasters. The Germans set the speed of their bomb at precisely the point where the defenses they knew about could not reach it. They did the work correctly. The data was sound. The data was also frozen. On the 2nd of September 1942, Hawker’s chief test pilot, Philip Lucas, lifted the first Tempest prototype off the runway.

Three months almost to the week after Lucer handed in his specification. The thin wing behaved exactly as the aerodynamic theory said it should, which in wartime development on an untried configuration is not a thing anyone is entitled to assume in advance. Lucas came back with good news. The Germans had closed their survey of British fighter performance before the aircraft that would undo it had left the ground for the first time.

In April 1944, the Tempest entered squadron service. Number 486 squadron, a New Zealand unit, received theirs first, followed by number three squadron and number 56. Together they formed the first Tempest Wing number 150 at New Church Advanced Landing Ground, a strip of matting laid across Romney Marsh in southern Kent, chosen for one reason above all others.

It sat directly beneath the approach lanes. The wing commander was Roland Bemont. He had flown hurricanes over France in 1940, gone through the Typhoon program, and then spent time at Hawker as a test pilot, where he and the pilot Bill Humble had shared the final development flying on the Tempest itself.

He came back to operations in early 1944 to form the wing, and he knew the machine he was commanding at a level almost no operational commander ever achieves. He had helped make it what it was. Eight weeks later, the first flying bomb crossed the English coast. And the pilot sitting in the dark on Romney Marsh, learning how to look at a flame without letting it blind him, had a name. He was Joseph Barry.

Before you can understand what happened over Kent that summer, you have to understand what the Royal Air Force was actually being asked to shoot down. Because almost everything about it was wrong. The Argus pulse jet had no rotating components. None. No turbine, no compressor, no propeller, no crankshaft, nothing that spun.

It was a steel tube with a bank of spring-loaded shutter valves at the front. Air came in, fuel sprayed into it, the mixture fired, the pressure slammed the shutters closed, the gas blasted out the back, the pressure dropped, and the shutters snapped open again for the next breath. 50 times a second all the way from the pod cala to London.

That buzzing the people of southern England learned to dread, was not an engine note in any sense they understood. It was the mechanical rhythm of steel flaps opening and shutting, amplified by a resonating pipe, and it carried for miles. The crudeness was the entire point. There was almost nothing in a flying bomb that could be usefully broken.

Machine gun rounds could punch clean through the engine casing and the weapon would keep flying because there was nothing in the casing to destroy. It had no pilot to wound, no radio to jam, no crew to demoralize. It could not take evasive action, but it also could not be frightened into taking evasive action. The fuse in the warhead was designed so that even a bomb that failed in flight would still detonate on impact, which meant the Allies could not simply gather up a wreck and study it at leisure.

The Germans had not built this thing to impress anybody. They had built it to be unkillable by the Royal Air Force of 1942 and cheap enough to make by the thousand. Those were the two requirements and by both of them the design was a success. So when the campaign opened on the 13th of June and Fighter Command sat down to work out what in its inventory could actually catch one, the list shortened very fast.

The standard Spitfire marks were ruled out almost immediately. They were magnificent aircraft and they were too slow at low altitude. The Mustang was better at height than at the deck and the flying bombs did not fly at height. The mosquito took on the night work where its radar and its endurance were worth more than raw speed.

What remained in position with the lowaltitude performance and the firepower to do the job was the Tempest Wing at New Church. At the start of the campaign, it numbered fewer than 30 serviceable aircraft. And here is where the popular version of this story falls apart. Everyone remembers The Tempest as the aircraft that ran down the flying bombs.

The phrase turns up in books and documentaries and museum captions. Ran them down, chased them, and caught them. It did not. Not in the way the phrase suggests, and not at first. The Tempest Mark 5’s maximum speed in level flight at sea level, measured formally under test conditions, was around 376 miles an hour at combat power.

Higher up, it was a different animal. It made about 421 at 15,000 ft and around 426 at 18,500. But down where the flying bombs actually flew at 2,000 feet over the channel, the fastest low-level fighter in the Royal Air Force was doing 376. The V1 cruised at about 400. In a straight tail chase, same altitude, both machines flat out and level.

The bomb was faster than the fighter. It would sit there in the gunsite, small and steady, and slowly shrinking. and there was not one thing the man in the cockpit could do about it. On those specific terms, Robert Lucer’s calculation was still correct. In June of 1944, he had asked for a weapon that British fighters could not catch in level flight down low.

And that is exactly what the Fasler works had delivered. The first fortnight of Operation Diver was for the pilots at New Church, a fortnight of losing. They flew and they flew. They scrambled on the observer core plots. They got themselves into the right patch of sky and they watched. Some of them fired from ridiculous range out of sheer frustration and watched the tracer fall away underneath.

Some of them hung on until the fuel state forced them to turn back, then turned back and watched the small dark cross go on toward the city with its flames steady behind it. Then they landed and the ground crews found the ammunition bays still full and nobody said very much. Down the road in the villages of Kent and Sussex, people were learning the rhythm, the buzz, and then the cut and then the counting.

It is worth staying on the ground for a moment because the pilots were not the only ones doing arithmetic that summer. A woman hanging washing in a garden in Asheford hears it coming from the southeast. that flat ripping note carrying across the hopfields. And she does not run because running is pointless when you do not yet know where it is going.

She stands with a wet sheet in her hands and she listens. The note gets louder. It passes overhead. It starts to fade. That is the good outcome. And she goes back to the line. What she is listening for is the cut. Not a stutter, not a cough, but the clean mechanical silence of an engine that has been switched off on purpose by a little propeller on the nose that has finished counting.

And when that silence comes, everything within a mile of it stops moving. Farm workers straighten up in the middle of a field. Children are pulled off bicycles and pushed into ditches by mothers who do not have time to explain. Shopkeepers put a hand flat on the counter and wait. 12 seconds is a long time when you are inside it.

It is long enough to think a complete thought. Long enough to look at the person next to you. Long enough to wonder whether it is coming down here or on the next village and then to feel ashamed of hoping for the next village and then to hope for it anyway. The whole of Southeast England had been issued a new reflex and it was being reinforced several dozen times a day and it did not switch off when the allclear went.

The answer when it came was not more speed. It was geometry. The pilots at New Church worked out that they were fighting the problem in the wrong dimension. They had been trying to beat the bomb in a straight line and in a straight line the bomb won. But the Tempest was fastest not at sea level where it had to fight the thick air, but higher up at 10 to 12,000 ft where it could make something in the region of 408 to 410 m an hour.

That was faster than the bomb. It was just faster in the wrong place. So they stopped flying at the bombs and started flying above them. The technique became standardized across the wing within days. climb to 10 or 12,000 ft. Patrol the coastal approach lanes out over the water, throttled back, saving fuel, waiting on the radio.

When the plot came through, or when a pilot spotted that unmistakable orange flame tracking across the sea below him, roll into a dive. The dive was the whole trick. It converted stored altitude into speed the engine alone could never produce. A Tempest coming down from 12,000 feet arrived in the bomb’s airspace doing well over 450 miles an hour, and it arrived not from behind, but from the side, or from slightly ahead, cutting across the flying bomb’s ruler straight track at an angle.

They were not out running the V1. They were out positioning it. They were spending height they had gathered 10 minutes earlier to buy a burst of speed at the exact moment they needed it. And the geometry of that interception was something no German engineer had modeled because no German engineer had been asked to model it.

It was a tactical solution to what was on paper a physical impossibility. Then the killing started and the killing turned out to have a problem of its own. 850 kg of amatl is a great deal of high explosive. It is roughly 1,900 lb and it is packed into the nose of an airframe made of thin steel and plywood and it does not need a fuse to go off if a 20 mm cannon shell arrives with enough energy.

Standard Royal Air Force gun harmonization put the convergence of the four cannon well out in front of the aircraft on the reasonable assumption that you would be shooting at something that was maneuvering and shooting back against a flying bomb. That setting was almost useless. The target was small and it did not maneuver.

So you wanted to be close enough to guarantee hits, but close enough to guarantee hits was also close enough to fly through the fireball. Pilots died learning where that line was. A 20 mm round finds the warhead and the sky in front of the fighter turns into a ball of burning gas perhaps a hundred yards across and the aircraft is inside it before the man flying it has any say in the matter.

Others came back to NewHurch in machines that should not have been flyable. Canopies blown clean away. So the pilot flew home in the open air with his goggles gone, fuselage frames bent, skin panels gone, engines throwing oil across the windscreen and shaking hard enough to blur the instruments.

The Tempest was a heavily built aeroplane, a thing of steel tube and stressed skin, and the wing learned by experiment exactly how much of its own success it could survive. Bemont’s response was to tighten the harmonization to 300 yards, closer than the standard setting, and to enforce it across the whole wing.

300 yards was the compromise. Near enough that the guns did their work with the first burst rather than the fourth, far enough that when the warhead let go, the fighter had a chance of being outside the radius. It was adopted almost immediately and it was the sort of decision a commander can only make properly if he understands both the aircraft and the arithmetic which Bemont did because he had helped build the aircraft and he was flying the missions himself.

By July the wing had another problem and this one had nothing to do with the enemy. The defenses of southern England had been organized in a hurry and they were fighting each other. Anti-aircraft batteries had been positioned inland around the approaches to London, which meant they were shooting up through airspace that fighters were using.

Fighter pilots chasing a bomb across Kent found themselves flying into their own side’s barrage. Gunners tracking a bomb found a tempest in the same piece of sky and had to choose between holding fire and killing an Englishman. The fix when it came was one of the largest and fastest logistical reorganizations of the home defense war.

The entire gun belt was picked up and moved to the coast so that the guns had a clean field of fire out over the sea and the fighters had everything inland. Thousands of heavy guns, their radar sets, their generators, their crews, and their ammunition shifted in a matter of days along roads that were already carrying the supply traffic of the Normandy campaign.

After that, the layers stopped competing and started stacking. Fighters over the water and the coastal approach, guns on the shoreline, balloons on the perimeter of London for whatever got through the first two. Meanwhile, at New Church, the ground crews were doing things to the aircraft that no maintenance manual described. The word had gone back to Hawker and to Napier, asking a simple question.

Can you give us more speed down low? The answers were not elegant. Strip the paint or polish what was there until it shown. fill and smooth the joints where rivets and panel lines were dragging at the air and run the saber on 150 grade fuel, which was essentially 100 octane with additional tetraylled lead, allowing the engine to be pushed to boost pressures that Napier had never previously recommended.

It worked. Sea level speed climbed toward 416 mph on the indicator by the winter of 1944, which finally put the Tempest at parody with the bomb and better in the same air on the same line. It also fouled spark plugs, shortened engine life, and gave the fitters a running headache that lasted the rest of the year.

Nobody at New Church cared very much. Sydney Cam’s thin wing had bought them the aerodynamics. The fuel bought them the last few miles an hour, and the men who serviced the engines simply accepted that they would be changing plugs at a rate the peacetime air force would have considered scandalous. Between the geometry and the fuel and the gunnery, the wing had solved the daylight problem.

What it had not solved, and what nobody had solved, was the dark. The flying bombs did not stop at night. If anything, the night was worse because the sirens went and the counting started and there was nothing overhead but the sound. Night interception of a V1 was by any reasonable measure among the most demanding flying of the entire war.

The target was small. It was fast. It came without warning over a countryside under total blackout with no ground reference, no radar direction worth speaking of for a fighter working alone, and no second chances. And the only thing a pilot could see was the flame. That flame was 10 ft of raw fire pulsing 50 times a second, and looking at it directly for more than a few seconds destroyed the night vision a man had spent half an hour building up.

So a pilot would find his target, close on it, and then be effectively blind at exactly the moment he had to judge range within a few hundred yards, hold formation with a bomb doing 400 m an hour, fire, and break away before the explosion caught him. Joseph Barry did it 59 and a half times. He had come to this through an unglamorous route.

Hurricanes in North Africa, then night fighting, which is a specialized and largely unrecognized trade. Then the fighter interception unit, an experimental outfit which had formed a Tempest flight at New Church in June of 1944, precisely to work out how this job could be done at all. On the 23rd of August, he was given command of number 501 squadron at Manston.

The half in his score is there because that is how the Royal Air Force counted a kill shared with another pilot. And it is worth saying plainly that different tallies exist in different records depending on how shared claims and unconfirmed claims are treated. But every serious accounting puts Barry at the top by a wide margin and no other pilot in the campaign came close to him.

He was 24 years old. Somewhere in among that total is a fact that says more about the man than any number. He did much of it alone in the dark in an aeroplane whose engine had been tuned past its designed limits, hunting a weapon that would kill him if he got the range wrong by a 100 yards. Picture the cockpit on one of those nights.

The instrument lighting turned down until the dials are barely legible because anything brighter cost you the outside world. The saber hammering away in front of you. 24 cylinders running on fuel that is eating its own spark plugs, filling the airframe with a vibration you stopped noticing weeks ago. Below and ahead, nothing.

England under blackout is not dark the way a room is dark. It is dark the way the sea is dark. An absence with no edges. And the only way to know where the ground is at all is to trust an altimeter you can hardly read. Then the flame appears and everything simplifies and gets worse at the same time.

It is a hard orange bar of fire in a world with nothing else in it, pulsing so fast it seems solid and it gives you a bearing and takes away your eyes. You close. You have no reference for range except the size of that flame. And the flame is lying to you because fire at night always looks nearer than it is. You are guessing. You are guessing at 400 m an hour, roughly 2,000 ft above a country full of sleeping people.

And if you guess short, you die inside your own success. There was no instrument for that. There was only doing it and then doing it again the next night. While Barry was working the night, the British government was betting on something else entirely. In July of 1944, the Royal Air Force pushed the Gloucester Meteor into operational service with number 616 squadron.

It was the first Allied jet fighter to fly combat operations, and it was rushed into partial readiness for one specific reason. Some of the planners had concluded that only a jet could reliably hold the speed needed at low level to catch a flying bomb. It is a perfectly logical conclusion. It also turned out to be wrong. The meteor was fast enough.

Its guns were not reliable. Pilots closed on flying bombs, pressed the trigger, and got jams. On the 4th of August, one of them, having found his cannon dead yet again, resorted to flying alongside the bomb, and using his wing tip to upset it, which is how Britain’s first operational jet scored its first kill.

Before the ground launched campaign ended, the meteors had destroyed 13 flying bombs. Some sources say 14. Number 150 wing destroyed 638. Sit with that comparison for a moment because it is the heart of this story. The Royal Air Force had rushed a jet aircraft into combat because it believed a propeller could not do the job.

The propeller was already doing the job off a grass strip in Kent and it outscored the jet by roughly 50 to1. 638 out of 1,846 flying bombs destroyed by Allied fighters. Roughly one in three. One wing, three squadrons, an aircraft that existed because a designer had wanted to fix a dive problem on a different aeroplane in 1941.

And the wing had one more trick, which is the strangest thing in the whole affair. Pilots discovered somewhere in that summer that they did not always need guns. If a Tempest slid up alongside a flying bomb and placed its wing tip roughly 6 in under the tip of the bomb’s wing, the disturbed air spilling off the fighter’s wing was enough to lift the bomb’s wing, roll it, and overwhelm the gyroscope holding it level.

The autopilot would try to correct, fail, and the weapon would tip into a dive it could not recover from. There was no need to touch it. Bemont was explicit about this in the oral history recording he made for the Imperial War Museum. It was the turbulence that toppled the gyro, not contact. Metal never metal. Think about what that actually required a man to do.

Fly at close to 400 m an hour. Slide sideways until your wing tip is half a foot from a weapon carrying 1,900 pounds of high explosive. Hold it there. Generate an aerodynamic effect you cannot see, cannot feel through the controls, and cannot verify until it either works or does not. And trust the physics to resolve before anything else does.

It was used when the ammunition ran out. It was used when the bomb was too close for cannon fire to be survivable. and it was used sometimes simply because it was more certain than shooting. At least 16 kills are confirmed to have come from wing tipping. The real figure is almost certainly higher because a pilot who tipped a bomb over the channel at dusk did not always have a witness.

You do not learn that in a training syllabus. There was no syllabus. It evolved in the air on operations out of a specific and immediate necessity invented by young men who had run out of ammunition and were not willing to go home. None of this though won the campaign on its own. And it is important to be honest about that because the men who flew it were honest about it.

The three-layer system worked because it was a system. The guns owned the bad weather and the darkness, and they got dramatically better as the summer went on for two reasons that arrived from America at almost exactly the right moment. The first was radar directed fire control, which allowed a battery to compute a firing solution automatically against a target flying a completely predictable course, and a flying bomb flew the most predictable course in the sky.

The second was the proximity fuse, a shell that carried a tiny radio transmitter in its nose and detonated when it sensed something close by instead of requiring a direct hit or a guess at the fuse setting against a small target at speed. That was the difference between shooting near a flying bomb and killing one.

The results showed it. The kill rate inside the coastal gun belt climbed from about 17% in the first week the guns were in their new positions to 60% by the 23rd of August to 74% in the last week of that month. On one day it reached 82. The balloons, unglamorous and static, caught the stragglers that came through the coastal belt on a line toward the cap, and in clear daylight, out over the water and along the coastal approaches, the Tempests held the line.

No single layer could have done it, but the layer that reached the bombs first, in the conditions where most of them came, was the one the Germans had specifically calculated could not exist. In Germany, they knew something had gone wrong. What they never worked out was what? The response came in the shape you would expect from a competent technical organization that has been given bad news.

Later production batches of the flying bomb flew faster and further than the early ones. Launch crews experimented with lower approach altitudes on the reasonable theory that a bomb coming in lower gave the defenders a shorter reaction window. And from September of 1944, with the ground launch sites falling, they began releasing the weapons from the air, slung under Hankl 111 bombers flying out over the North Sea at night, where the whole altitude conversion trick the Tempest pilots depended on, became far harder to execute. Every one of those

adaptations was sensible. Not one of them solved the problem. They failed for a reason that is easy to state and was impossible for the Germans to see at the time. The changes were built around a general impression that Allied defenses were performing better than expected. They were not built around a correct identification of which aircraft was responsible and how it was achieving its interceptions.

The Tempest was not in the assessment. It could not have been. The assessment had been closed in the summer of 1942, three months before the prototype flew, and Robert Lucer’s speed requirement had been set against an inventory of British fighters that no longer described reality by the time his weapon was launched in anger.

You cannot counter what you cannot correctly name. And in the end, the campaign was not stopped by fighters at all. Through August and into September of 1944, Allied armies pushed north and east out of Normandy, through France and into Belgium. And in doing so, they walked over the thing that had been killing London.

The launch sites in the Pota, the ramps and the storage bunkers and the servicing sheds were taken by ground troops with rifles, not shot down, occupied. That is the unglamorous truth at the center of Operation Diver. The three-layer defense bought time and saved a very large number of lives, and the men who flew it and manned the guns and winched the balloons earned every word ever written about them.

But the ground launched flying bomb campaign against London ended because infantry took the ground it was launched from. Air launched attacks carried on sporadically through the winter. Then in March of 1945, the Germans went back to ground, launching from sites in the occupied Netherlands using an extended range version that could reach roughly 250 mi instead of the original 150.

The last one to fall on British soil came down on the 29th of March 1945 in a field near a sewage works at Dworth in Hertfordshire. Nobody was killed. Nobody was even hurt. After nine and a half months, the final flying bomb of the war put a hole in a Hertfordshire field, and that was the end of enemy action of any kind on the soil of the United Kingdom.

By that point, of roughly 9,521 ground launched flying bombs, some 4,261 had been destroyed by the defenses, the interception rate had begun below 30% and finished above 80. But Joseph Barry did not live to see any of it. On the morning of the 2nd of October 1944, he took off in Tempest Mark 5 serial number EJ600 carrying the squadron code letters SDF leading a dawn patrol over the occupied Netherlands.

It was not a flying bomb sort. It was the sort of low-level armed reconnaissance the Tempest squadrons had moved on to now that the ramps in France were gone. hunting transport and troops and whatever else the Germans had put on the roads. He was flying at about 50 feet over Vinam in the province of Grooningan when his aircraft was hit by small arms fire from the ground.

Not a heavy anti-aircraft battery, not a radar directed gun, rifles and machine guns fired by men on the ground at an aeroplane going past at treetop height. There was no altitude to trade. That was the arithmetic he had built his entire war around. Height converted into speed, and at 50 feet there was nothing to convert and nothing to give away.

He was too low to bail out, and everybody listening on the radio knew it. His last transmission was recorded by the men flying with him. He said, “I have had it, chaps. You go on.” The Tempest came down near the village of Kibblegarn. He was 24 years old. He had flown alongside flying bombs 59 and a half times.

He had sat 6 in off the wing of a weapon carrying 1,900 pounds of aml and lived. He had done it at night blind more often than anyone else in the war and he was killed by a rifle bullet on a morning patrol in a fight that had nothing to do with any of it. 10 days later on the 12th of October near Boholt just inside Germany Roland Bemont went down the same way.

He was attacking a heavily defended troop train at low level. Flack caught him. It was his 492nd operational sorty of the war. He got out of the aircraft which Barry had not been able to do and he spent the rest of the war as a prisoner. first at Stalaglu 3 and then at Luckenvalda and he was still there in May of 1945 when Soviet troops arrived and opened the gates.

Two men 10 days apart, both brought down by fire from the ground in an aircraft that had been polished and refueled and tuned to the edge of destruction so it could catch something flying at 400 m an hour. None of that mattered at 50 ft over a Dutch field with men shooting up at you. The war went on without them. The Tempest squadrons moved to Vocal in the Netherlands and the fight changed shape again.

Now they were hunting aircraft over Germany, sweeping ahead of the bombers, escorting, going out on armed reconnaissance, and finding that the qualities which had made the Tempest lethal against a flying bomb worked just as well against machines with pilots in them. That included the Messmid 262. Germany’s jet fighter was faster than anything the Allies had, and in the air, it was very nearly untouchable.

In the landing pattern, it was not slow, committed to its approach, unable to spool up and accelerate away in time. It was vulnerable to a fast propeller fighter that arrived in exactly the right place at exactly the right moment. Tempest squadrons destroyed at least 20 of them. Pierre Clustermanman, the highest scoring French pilot in Royal Air Force service, flew with number three squadron during this period and wrote afterwards that the Tempest was the finest propeller-driven fighter he flew in the entire war. Hubert Lang, who

flew the 262 from the other side of that equation, called the Tempest the most dangerous opponent his jet encountered, and Robert Lucer and Fritz Goslau never knew any of it. They had done their work properly. That is the part worth holding on to. They designed a weapon that was genuinely faster in sustained level flight at low altitude than every Royal Air Force fighter than in service.

And when they finalized the specification, the performance data they used was real, verified, and correct. The requirement they set was accurate against the defenses there was evidence for. What they could not have known was that in 1941 in an English drawing office, a designer had proposed a thinner wing to cure a compressibility problem on a fighter that was falling apart in dives.

that the prototype of that design flew in September of 1942, three months after the flying bomb specification went in. That by April of 1944, the aircraft born from that wing would be sitting on a strip of matting on Romney Marsh 8 weeks before the first bomb crossed the coast and that it would go on to destroy more flying bombs than any other single unit in the campaign, including the jet fighter the Royal Air Force had rushed into service.

specifically because it believed no propeller aircraft could do the job the propeller aircraft was already doing. The Tempest was never designed to catch a flying bomb. Nobody at Hawker in 1941 had ever heard of a flying bomb. Sydney Cam proposed the thin wing to stop typhoons shaking themselves apart above 450 m an hour in a dive.

That decision, technical, practical, narrow, aimed entirely at a different problem, turned out to be the precise answer to a threat that did not exist when the answer was drawn. The Napier Saber did not survive the piece. The 24 cylinder engine that had nearly killed the Typhoon program and had taken years of expensive and painful engineering to make reliable was discontinued after the war.

Jets made it pointless. Its sleeve valve design demanded skilled maintenance and highquality fuel and the peacetime air force was not willing to pay for either. It became dependable at almost the exact moment it stopped mattering. Bemont came home and in 1947 he became chief test pilot at English Electric. On the 13th of May 1949, he flew the first Cambra jet bomber.

On the 4th of August 1954, he took the P1 off the ground on its first flight, the aircraft that became the Lightning. He was the first British pilot to exceed the speed of sound in level flight in a British designed aeroplane and later the first to fly a British aircraft at twice that speed. The man who had spent the summer of 1944 chasing flying bombs over Romney Marsh spent the following decade pushing British aviation through the sound barrier and out the other side.

Of roughly 1,700 Tempests built, exactly one remains airworthy today. 638 times in the summer of 1944, a German flying bomb crossed the English coast at 400 m an hour and met the one Royal Air Force aircraft that could reach it. Not by chasing it down in level flight, because in level flight that was impossible and the Germans had proved it on paper.

by climbing above it, by converting height into speed, by arriving from a direction and at an angle that nobody in the Fasler works had ever been asked to consider. The German calculation was not wrong. The aircraft it failed to account for was already in the