This weapon looks as if its creator had gone mad or lost the battle with the laws of physics. The barrel is bent at a right angle. The bullet, which should fly apart into dust, somehow flies around the corner. When American experts first saw the blueprints, they decided that it was either a technical defect or a complex German prank.

 After all, every soldier knows that it is impossible to shoot from a crooked barrel. But it was no joke. Behind this absurd bend in the barrel lay a primal fear, the fear of the Panzerafa elite, the crews of Tigers and Ferdinands, who suddenly realized a fatal paradox. Their machines, invulnerable to artillery from miles away, were completely defenseless against a single infantryman at arms length.

This is the story of the Krumlau. A device that attempted to cheat ballistics in order to save people from being burned alive. A story about how engineers solved a problem they themselves had created by building steel giants without eyes or ears. And to understand why the curved barrel was not madness, but a cruel necessity, we need to go back to the summer of 1943, to the moment when German tankers first heard the sound of enemy boots on the roof of their turret.

In the summer of 1943, on the northern face of the Kursk Bulge, 89 Ferdinand heavy tank destroyers went into the first echelon of the German offensive as part of Field Marshall Models 9th Army’s 51st Tank Corps. 200 mm of frontal armor and a longbarreled 88 mm gun allowed these machines to strike Soviet T34s long before they could get within range of any effective return fire.

 The 653rd Heavy Tank Destroyer Battalion claimed to have destroyed 320 Soviet vehicles during the operation. Gun commander Emanuel Schlinska later recalled that heavy Soviet tanks repeatedly fired on the Ferdinands from the front without visible effects. And with all this firepower, the vehicle had a flaw so basic that it sounds like a dark joke from the design bureau.

 The Ferdinand did not have a single machine gun to fight infantry. 65 tons of steel, invulnerable to tank shells, and not a single means of fending off a soldier with a bottle of incendiary mixture. Soviet infantrymen quickly realized this, and their tactics were brutally simple. Let the steel behemoth advance, wait until it broke away from the accompanying infantry, then approach from the flanks, climb onto the armor, and throw bottles of flammable mixture into the engine compartment.

 The six-man crew, locked inside, had no side view periscopes, no rotating turret, and no viewing slits to see what was happening a meter from the side. The only way to fight back was to open the top hatch and stick their heads out with their personal weapons, exposing themselves to point blank fire.

 Gudderion later called the use of Ferdinands against infantry quail hunting with cannons. But for the crews who heard the sound of boots on the roof of their vehicle and were unable to do anything about it, the inspector general’s metaphor sounded mockingly mild. The problem was not limited to Ferdinand. Reckless self-propelled guns, assault guns, and tank destroyers of various types suffered from the same design flaw.

 combining powerful weapons for long range combat with almost complete helplessness in close contact with infantry in urban combat on the Eastern Front where Soviet tank destroyers approached vehicles through ruins and basement. This turned into a systemic disaster. The obvious solution came in an obvious way.

 When the surviving Ferdinands were upgraded to elephants in the winter of 1943 to 1944, the vehicles finally received an MG34 machine gun. However, this only solved part of the problem. Because the machine gun had a limited firing range and could not reach the blind spots along the sides and rear for hundreds of other vehicles, the issue of close-range defense remained unresolved and painful.

Against this backdrop, Albert Spear’s technical management officer at the Ministry of Armaments proposed a solution that sounded like engineering nonsense. It was not the gunner who had to expose himself to the enemy, but the barrel and a barrel curved so that the bullet changed direction and flew out at an angle to the axis of the weapon.

 This would allow fire to be conducted from under the protection of armor without opening the hatch and exposing one’s head. The man’s name was Hans Yookakam Shada and he was neither a weapons designer nor a ballistics expert. Before the war, Shada ran a washing machine factory in Salfeld that employed more than 500 people.

 During World War I, he served as a lieutenant in the observation balloon unit. And then in the fall of 1943, this former factory owner proposed something to the rain metal bors concern that contradicted everything ballistics knew about the behavior of a bullet in the barrel. Shed’s first idea was intuitive. Take a 20 mm caliber barrel and use it as a chute to guide an 8 mm bullet along a curved trajectory.

 The wide channel, according to the plan, was supposed to reduce friction and allow the bullet to change direction smoothly. It didn’t work. The bullet bounced around inside the widened channel, losing energy and stability, and flew off in any direction but the target. Then the engineers at Reinmatal Borsik tried what was considered impossible, bending a rifle barrel to the exact caliber of the bullet itself.

 The technology turned out to be bold and surprisingly elegant. The finished barrel with the rifling already applied was coldformed, carefully bent in a special fixture, and the rifling followed the bend, maintaining its spiral geometry. However, it was impossible in principle to make the bullet pass through such a bend without consequences because when entering the bend, it pressed against the outer wall of the rifling with enormous force, generating tremendous friction and a pressure surge capable of tearing the barrel apart. The solution

was a series of gas vent holes drilled before the entrance to the bend, which released some of the powder gases to the outside, allowing the bullet to slip through the curve by inertia, slower and messier, but still slip through. And to prevent the escaping gases from obscuring the optics, a triangular deflector wedge was installed above the holes to divert the jet to the side.

 For the tank version, the design was even bolder. The barrel was bent at a 90° angle. The sturm was mounted vertically inside the vehicle and the curved barrel passed through a hemispherical ball joint in the hatch cover which allowed it to rotate 360°. The crew used a 1.5 times periscopic site developed by the Bush Company from Ratinau and Zeiss supplied the sighting optics for the production models.

 In December 1943, Hitler personally approved the project. Ryan Matal Borsig received the contract. It remained to be seen whether physics would accept the fact that the bullet was forced to turn. Physics did not accept it. Post-war tests at the Aberdine Proving Ground in Maryland revealed what German engineers had been struggling with from the very beginning, but had never been able to overcome. The 7.

92 by 33 mm Kurt’s intermediate cartridge bullet passing through the bend experienced lateral loads for which it was simply not designed and broke in half along the canalure. a ring-shaped groove that under normal conditions simply holds the bullet in the cartridge case in a curved barrel. This groove became a line of destruction.

 Instead of a solid bullet, two or three fragments flew out at the muzzle, spreading out in a fan shape, which created an unintended shotgun effect. At a distance of more than 50 m, this made aimed shooting pointless. However, at arms length at the sight of a tank, this very scattering effect could be a strange advantage because aiming at a person at a distance of 3 m was not necessary anyway.

 But the main price was still the resource. The 30° infantry version could withstand about 300 shots, which was equivalent to 10 magazines. The 45°ree version could withstand 160. The 90° tank version could withstand even less. The inventor She claimed a resource of 6,000 shots, but reality reduced this figure by 20.

 The throat of the Ben stretched. The rifling wore away. The barrel channel acquired an oval crosssection, and at some point, the barrel simply stopped guiding the bullet. Automatic fire from the infantry version caused another problem. The lateral force from the change in the bullet’s direction twisted the weapon to the side, making the burst uncontrollable and dangerous for the shooter himself.

 Ryan Metal Borsig received an order for 20,000 units per month. The plan was to supply every infantryman armed with a stomg with a 30° crumblaf. The scale of the ambition was impressive, but between the order and reality lay a gulf that German industry in the winter of 1944 to 1945 was no longer able to bridge. Nevertheless, positive reviews came in from the Eastern Front and tank crews asked for more.

The positive reviews were not mere politeness or bureaucratic formality. For tankers, who before the appearance of the Krumlau could only rely on a hatch and a pistol, even an imperfect weapon meant the difference between life and death. On Panzer 4 vehicles, the only German armored vehicle in serial production where the Krumlau was standard equipment, the tank attachment was mounted on the loader’s hatch and allowed the crew to fire without leaving the vehicle or opening the armor.

The maximum effective range was about 15 m, which meant practically nothing on the scale of the battlefield. But it was precisely at this 15 m range in the dead zone at the side of the vehicle where an infantryman was preparing to throw a grenade into the engine compartment that the crew’s survival was decided.

 The dispersion of bullet fragments, which under normal conditions was a catastrophic disadvantage at such a distance turned into something like a shotgun blast for which accurate aiming was not necessary. 300 rounds of ammunition meant two, maybe three combat engagements with infantry, 10 magazines. For a crew locked in a steel box, that could be enough to survive until morning.

 In November 1944, Shade received the rank of colonel and the knight’s cross to the warmer merit cross with swords for an invention that the Americans would dismiss as a solders’s joke a few months later. However, the same insurmountable gap still lay between the award and mass production. By the beginning of 1945, the gap between plans and reality had become definitive.

 Of the 20,000 units ordered monthly, only about 500 tank attachments were delivered during the entire war. Approximately 1,500 Zeiss periscopic sights manufactured by January 1945 were partially unused because there were not enough barrels for them. The infantry version was produced in even smaller quantities. Production at the Rin Matal Borsig factory in Guben came to a halt in February 1945 when the front line approached the city and the equipment was hastily evacuated to Somda.

 However, evacuation at this stage of the war meant agony rather than salvation because little remained of the production facilities which had been burning for months under Allied bombs. Even those crumbloffs that reached the front were faced with an insurmountable logistical problem. The barrel attachment with a capacity of 10 magazines was a consumable that required constant replacement, but there was nowhere to get spare barrels.

 Without supplies, a weapon with a capacity of 300 rounds became disposable. In frontline photographs, the Panzer 4’s Krumlav port is more often closed than open, and crews preferred traditional close-range defense weapons, not because the Krumlav was useless, but because it could not be relied upon systematically. This became an accurate metaphor for the entire late German war machine.

Brilliant solutions, impossible production, dead logistics. The Krumlau did not fail as an idea. It sank along with the ship on which it sailed. However, the story of the Crooked Barrel did not end with the capitulation of the Reich, just as the story of its creator did not end. The Americans did not discard the Krumlau as a curiosity.

It was seriously tested at the Aberdine proving ground, and Colonel Quinn’s final report sounded unexpectedly respectful for an assessment of enemy weapons. Despite the theory of a curved barrel contradicting conventional ideas about bullet delivery, it deserves extensive research and development. Quinn specifically noted that for a heavy 45 caliber pistol bullet, varying degrees of curvature could be quite practical.

 By that time, American engineers had already experimented with curved barrels for the M3 grease gun submachine gun for exactly the same reasons as the Germans, namely to protect tank crews from infantry. The project never progressed beyond the prototype stage. Soviet specialists seized the samples and conducted their own tests of the 90° version.

 With one chroml and a thousand rounds of ammunition at their disposal, they managed to fire less than 100 rounds before the mounting coupling deformed from the impact loads and the curved barrel began to wobble, completely losing its accuracy. Nevertheless, the report recommended creating similar devices for the PPSH41 Mosen rifle and Sudv submachine gun.

None of these projects progressed beyond the drawing board. Three powers, three attempts, one result. The physics of a curved trajectory in the barrel of a firearm proved a wall that neither German ingenuity, American resources, nor Soviet stubbornness could breach. However, the idea itself to shoot from behind cover without exposing oneself did not disappear.

 It simply found another way. The Israeli corner shot adopted by special forces around the world solves the same problem, but in a fundamentally different way. It is not the barrel that bends, but the body platform of the weapon. The bullet still flies in a straight line, and the camera and monitor have replaced the fragile periscope of the 1940s.

Shed’s own fate mirrored that of his invention. Captured by the Soviets in May 1945, he was deliberately persecuted by military tribunals precisely for creating the Krumlaf and working on tank weapon systems. Eight years in Soviet camps, liberation in 1953, a quiet return to Germany, death in 1967. The man who received the Knight’s Cross for attempting to bend a bullet spent the first years of peace paying for that very attempt.

The only surviving Krumlaf tank with a complete mount is now in the military technical museum in Cooblins at Rock Island auctions. Stermgave with krumloffs sell for some starting at $65,000 and it is such a rare item that collectors doubt its authenticity until they see it with their own eyes. The krumlau was neither a miracle weapon nor an engineering absurdity.

 It was the answer to a question for which there was no good solution, only a lesser evil. How could a tank driver stay alive when the enemy was already on the armor and the only way out meant a bullet in the head? The answer given by a former washing machine manufacturer from Saltfeld violated all accepted laws of ballistics.

 It was fragile, short-lived, and operated at the very limits of what physics allowed. But it existed, and before it, there was nothing. 300 rounds, 10 magazines, 15 m range. It wasn’t enough to win the war, but the man inside the armored box wasn’t thinking about the war. He was thinking about living to see the morning.