The Me 262 flew on its jets in July 1942 and fought from the autumn of 1944, and for the pilots who met it, it was a glimpse of the next war. Nothing with a propeller could catch it. Its engines were built from mild steel because Germany had no nickel to spare, and lasted ten to twenty-five hours; its pilots were few and its fuel was scarce; and Allied fighters learned to wait over its runways, where it was slow and helpless. Fourteen hundred were built and about three hundred fought. It changed nothing about how the war ended, and everything about what came after.
870 km/hTop speed1,430 (~300 fought)Built
2· WHY IT MATTERED
Speed became a different game
A propeller loses its grip as its tips approach the speed of sound, which is why piston fighters stalled out at about 700 km/h no matter how much power they had. A turbojet has no such limit. The Me 262 cruised where a Mustang could only dive, and every fast aircraft since has followed it.
Its four 30 mm MK 108 cannon fired about 14 kg of shells a second, six times a Mustang’s weight of fire, and a handful of hits would take a bomber apart. The shells were slow and the guns emptied in eight seconds, so pilots closed fast and fired late. Racks of R4M rockets, fired from outside the bombers’ gun range, were added in 1945.
A jet accelerates slowly, and the Jumo 004 flamed out or burned its turbine if the throttle was moved too fast. On take-off and landing the 262 could neither run nor turn, and Allied fighters loitered over its airfields to catch it there. Hitler’s order to make it a bomber delayed its debut by a few weeks; engines, fuel and pilots were the real limits.
5· THE ENGINE
A turbojet made of the wrong metal
The Jumo 004 was the first axial-flow turbojet in production, the layout nearly every jet engine has used since. Its prototypes used nickel, cobalt and molybdenum that the blockade had cut off, so the production engine replaced them with aluminium-coated mild steel and hollow turbine blades folded from a chromium-manganese sheet and cooled with air bled from the compressor. It took 375 man-hours to build against 1,400 for a BMW 801 radial, and it lasted a working day. Move the throttle too quickly and it flamed out; move it faster and the turbine burned.
2× Junkers Jumo 004B · axial turbojet · 8-stage compressor, 6 combustors, 1-stage turbine · 8.8 kN each · 719 kg · 10–25 hours’ life
The MK 108 was a short, cheap, blowback cannon firing a 330-gram mine shell at only 500 m/s: hopeless at long range, devastating close in. Four of them gave the Me 262 the heaviest armament of any fighter of the war, for as long as the ammunition lasted. Against bombers it worked. Against a Mustang that could turn inside it, the cannon rarely got the chance.
7· TRY IT
Jet against propeller: thrust that does not fall with speed
The lab plots the thrust a propeller can deliver against speed — it falls as the aircraft goes faster — and the near-flat thrust of two Jumo 004s. Where the curves cross the drag of each aircraft is where the jet wins, and why it was so sluggish at take-off. The Jumo itself runs live on the Me 262’s Aviation-timeline page.
Readout
Weight of fire14.30 kg/s
Cannon share100 %
Seconds of fire8 s
Metal in this burst28.6 kg
Messerschmitt Me 262: the guns as carried on the main version; seconds of fire is the gun that runs dry first.
Messerschmitt Me 262, 9 of 10
Deep dive · A jet engine without nickel· opened from Messerschmitt Me 262
Timelines · WW2 aircraft · go deeper · Messerschmitt Me 262
A jet engine without nickel1944
The first production turbojet was built from mild steel, and lasted a working day.
8.8 kN·719 kg·10–25 h·375 man-hours
01The idea
Hollow turbine blades folded from sheet, cooled with compressor air, running near their melting point
A turbine blade lives in gas hotter than the metal it is made of would like, spinning fast enough that its own weight pulls on it with tonnes of force. The alloys that survive that are heavy with nickel, cobalt and chromium — the metals a blockaded Germany did not have. The production Jumo 004B was redesigned around what it did have, and it worked, briefly.
02Why it matters
Hollow blades from a sheet
The turbine blades were folded and welded from a chromium-manganese steel sheet, hollow, with compressor air blown through them to keep the metal below the gas temperature. The combustion cans were aluminium-coated mild steel. The engine took 375 man-hours to build against 1,400 for a piston radial, and cost a tenth as much.
03Why it matters
The resonance
In late 1943 blades began to fail in flight. Max Bentele found that the blades’ natural frequency fell in the engine’s running range and they were being shaken to death; he shortened and tapered them and lowered the speed from 9,000 to 8,700 rpm. The failures stopped. The life did not get much longer.
04Why it matters
Ten hours, twenty-five with care
A Jumo 004 was overhauled after ten to twenty-five hours; a careful pilot who moved the throttle slowly might double that. The same axial layout, in nickel superalloys with the same cooled hollow blades, now runs for tens of thousands of hours in every airliner engine. The idea was right. The metal was not there.
05Try it
The Jumo, live
The site’s turbojet demo preset to the Jumo 004: weak compressor, wartime turbine limit.
Readout
At 500 km/hthe propeller wins
Propeller efficiency83%
Crossover~600 km/h
Shapes, not certified data: the propeller curve carries a
tip-shock collapse near 650 km/h, the jet’s power available grows
with speed because its thrust barely falls. Every 1944 dogfight
report lives in the gap between those lines.