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🔥🚀 What if an engine could turn explosions into continuous propulsion? NASA is exploring rotating detonation engine technology, where a powerful detonation wave races around a circular combustion chamber instead of burning fuel in a conventional, steady flame. The result is an extremely rapid combustion process that can potentially... show more

Stellarix

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44,207 Aufrufe • vor 4 Tagen •via X (Twitter)

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31 Kommentare

Profilbild von Orbital Radar

Orbital Radarvor 3 Tagen

One of those propulsion concepts that sounds like science fiction until you realise the physics is very real. 🚀 Rotating detonation engines could be a major step forward if the efficiency gains scale reliably. Turning a continuously travelling detonation wave into usable thrust is an incredible piece of engineering. 🔥🛰️

Profilbild von Interesting Radar

Interesting Radarvor 3 Tagen

An explosion just running laps around the engine is such a weird concept

Profilbild von Stellarix

Stellarixvor 3 Tagen

Weird but best concept

Profilbild von Interesting Radar

Interesting Radarvor 3 Tagen

Yeah, it’s an awesome idea. Really hope this one works out

Profilbild von Colorado_Rick

Colorado_Rickvor 3 Tagen

In The Mote in Gods Eye creating a ship using nuclear explosions was key to defeating the attacking aliens. The idea has been around for a while. Thanks for the good read Larry Niven and Jerry Pournel.

Profilbild von 2d Peasant 𝕏

2d Peasant 𝕏vor 3 Tagen

Combusting chemical fuel IS continuous detonation. That's how chemical rocket engines work

Profilbild von 星のジプシー

星のジプシーvor 3 Tagen

Ｈ３ロケットがデトネーション（爆発燃焼）ロケットエンジンなんだよね。

Profilbild von Stellarix

Stellarixvor 3 Tagen

The H3 uses the LE-9 engine, but calling it a “detonation engine” is misleading. 🚀 LE-9 is an expander-bleed, staged-combustion-derived liquid engine using conventional combustion—not a rotating or pulse detonation propulsion system.

Profilbild von Vensaro

Vensarovor 3 Tagen

Sounds like a rotary engine to me. Been used in cars for decades.

Profilbild von aaron

aaronvor 3 Tagen

it looks amazing from this angle, love that ring

Profilbild von Stellarix

Stellarixvor 3 Tagen

Same here bro 😅

Profilbild von DD

DDvor 3 Tagen

cool

Profilbild von DeaconAR

DeaconARvor 3 Tagen

NASA needs better aluminum foil...

Profilbild von The Chuck

The Chuckvor 3 Tagen

when I was sandblasting/painting, to clean out a 20ft + pipe (12'-24') , with a air line blow againt the wall at an angle and the air would move out dust and sand all the way, blowing straight woul only get about 2 ft

Profilbild von SpaceXtcy

SpaceXtcyvor 3 Tagen

I was thinking of something like this but for harnessing the sun's rays and turning into power.

Profilbild von Stellarix

Stellarixvor 3 Tagen

That concept is basically solar power taken to the next level. ☀️⚡ Instead of relying only on conventional panels, concentrating sunlight or using advanced photovoltaic materials could capture more energy from the same area. The engineering challenge is converting that intense input efficiently without excessive heat losses.

Profilbild von Helgrim

Helgrimvor 3 Tagen

The internal combustion engine has been turning explosions into propulsion for over 100 years.

Profilbild von Stellarix

Stellarixvor 3 Tagen

And the fascinating part is how much the basic idea evolved. 🔥⚙️ Modern engines don’t simply harness explosions—they precisely control pressure, combustion timing, airflow, and heat to convert chemical energy into useful mechanical work with remarkable efficiency.

Profilbild von xjet

xjetvor 3 Tagen

RDEs are great... until you discover how much ancillary gear is involved in such an engine. Power to weight is pretty pitiful in comparison to a conventional gas-turbine engine (the latter requiring far less ancillary stuff).

Profilbild von Stellarix

Stellarixvor 3 Tagen

That’s the trade-off people often miss. 🔥 RDEs can offer impressive pressure-gain potential, but valves, injectors, cooling, fuel delivery, controls, and structural requirements can erase some benefits. The real comparison is system-level mass, efficiency, reliability, and scalability—not chamber performance alone.

Profilbild von xjet

xjetvor 3 Tagen

Yeah, I spent time working with PDEs where the same problems arise. Thats why my xjet engine is focused on minimal peripheral support gear but higher combustion efficiencies than a traditional pulsejet engine -- and a bypass system that increases total mass-flow.

Profilbild von Elliott Floyed

Elliott Floyedvor 3 Tagen

It’s absolutely incredible .. like detonations become ball bearings on a flame looper . It’s really impressive

Profilbild von Stellarix

Stellarixvor 3 Tagen

Yes bro you are absolutely right

Profilbild von RocketMan_99

RocketMan_99vor 3 Tagen

RDE? Sounds like my last Minecraft rocket. But seriously, the efficiency could be huge if they solve the cooling. That copper chamber looks wracked. Want to see a longer burn.

Profilbild von Stellarix

Stellarixvor 3 Tagen

RDEs are fascinating because they aim to extract more performance from combustion itself. 🚀🔥 But cooling is the brutal engineering challenge—detonation waves create extreme heat fluxes. A longer-duration burn would be the real test of whether the hardware can survive repeated operation.

Profilbild von DiscoCowboy

DiscoCowboyvor 3 Tagen

Looks like Star Wars

Profilbild von Toni Mousley

Toni Mousleyvor 3 Tagen

Clever

Profilbild von Hello my name is Human

Hello my name is Humanvor 3 Tagen

It looks incredibly cool 😎

Profilbild von Stellarix

Stellarixvor 3 Tagen

Yes NASA always hit different 💕💕

Profilbild von Matt Seal

Matt Sealvor 3 Tagen

What's that sticker made from

Profilbild von Stellarix

Stellarixvor 3 Tagen

From NASA legacy 😄

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India fires up next-gen engine generating more power with less fuel The Rotating Detonation Engine (RDE) built by IIT-Madras incubated D-Propulse was successfully tested at India's Defence Research and Development Organisation facility, producing 5 kN thrust even with limited air supply 🔸 Instead of burning fuel in a steady flame, the engine sustains supersonic detonation waves spinning around a ring-shaped chamber 🔸 This pressure-gain combustion delivers higher efficiency with more thrust from less fuel 🔸 A special aerospike nozzle maintains performance at any altitude, unlike conventional nozzles 🔸 The system reached Technology Readiness Level 5, meaning it's been validated in realistic conditions beyond just the lab This breakthrough strengthens India's indigenous propulsion capabilities, with potential applications in hypersonic aircraft, missiles, UAVs, and reusable launch systems reducing dependence on foreign technology

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Sputnik

16,177 Aufrufe • vor 1 Monat

We fired a really cool rocket engine - and broke some records while we were at it. 🔥This Rotating Detonation Rocket Engine produced more than 4,000 pounds of thrust, and included a 300-second continuous burn, which is believed to have set the record for longest duration hot firing of an RDRE engine to date. Watch it fire:

We fired a really cool rocket engine - and broke some records while we were at it. 🔥This Rotating Detonation Rocket Engine produced more than 4,000 pounds of thrust, and included a 300-second continuous burn, which is believed to have set the record for longest duration hot firing of an RDRE engine to date. Watch it fire:

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37,624 Aufrufe • vor 1 Monat

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Mechanical Knowledge

11,937 Aufrufe • vor 23 Tagen

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13,034 Aufrufe • vor 1 Monat

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T R U T H P O L E

517,981 Aufrufe • vor 6 Monaten

I've kept a pretty low (online) profile of what I'm building, but word's getting out. My company Astro Mechanica has invented a new kind of jet engine. Unlike any existing engine, it's efficient at every speed. Because it's efficient at every speed, we can use it in a new way: as the first stage of an orbital launch vehicle. The resulting platform will get payloads to orbit dramatically cheaper than all-rocket systems - among many possible applications. The key insight is to use electric motors to drive a compressor. That way we can make it spin at any speed, allowing it to "adapt" to it's airspeed and combustion cycle. One of the coolest parts: the video below is of a demonstrator my team and I built last year. We already have a new engine with 10x the thrust that will be complete next month.

Ian Brooke

8,098,117 Aufrufe • vor 2 Jahren

.Bob Allen practicing a V1 cut in our Westwind II today. There’s only one 1124 sim in the world - so we do our training in the actual plane! A V1 cut is an engine failure after V1 (takeoff decision speed). It means we’re past the point where a rejected takeoff is safe or possible, therefore we must take-off on the remaining good engine. All pilots practice V1 cuts on large multiengine aircraft, but usually in a simulator. We do it as part of every recurrent Checkride on the big jets, but it’s extra trippy doing it for real! That said, the “failure” is really just one engine being pulled back to idle thrust, so it’s available IF necessary. Notice - it’s barely even an event in the hands of a skilled professional pilot. Rudder is applied to the side of the good engine, directional control is maintained, and the aircraft is rotated into a climb at V2 while the non-flying pilot retracts the gear and the flaps. The “issue” and subsequent troubleshooting/shutdown procedures are delayed until the aircraft is at a safe altitude.

.Bob Allen practicing a V1 cut in our Westwind II today. There’s only one 1124 sim in the world - so we do our training in the actual plane! A V1 cut is an engine failure after V1 (takeoff decision speed). It means we’re past the point where a rejected takeoff is safe or possible, therefore we must take-off on the remaining good engine. All pilots practice V1 cuts on large multiengine aircraft, but usually in a simulator. We do it as part of every recurrent Checkride on the big jets, but it’s extra trippy doing it for real! That said, the “failure” is really just one engine being pulled back to idle thrust, so it’s available IF necessary. Notice - it’s barely even an event in the hands of a skilled professional pilot. Rudder is applied to the side of the good engine, directional control is maintained, and the aircraft is rotated into a climb at V2 while the non-flying pilot retracts the gear and the flaps. The “issue” and subsequent troubleshooting/shutdown procedures are delayed until the aircraft is at a safe altitude.

Steve Giordano

333,659 Aufrufe • vor 2 Jahren

As the CFM LEAP engine shuts down, you can hear the distinctive “whoosh” sound followed by a gush of air. That is the Reverse Bleed System (RBS) at work. During normal operation, a significant amount of fuel remains unpurged in the system after engine shutdown. This residual fuel, located near or within the hot section, vaporizes due to high temperatures and deposits carbon (coke) on the fuel nozzles. Over time, nozzle coking leads to several operational and maintenance issues, including loss of thrust, reduced engine efficiency due to incomplete combustion, accelerated deterioration of hot-section components (combustor and High-Pressure Turbine), engine start failures, potential engine stalls, and increased unscheduled engine removals. The Reverse Bleed System (RBS) prevents fuel nozzle coking by automatically introducing cool air from the core compartment into the engine core flowpath after shutdown. This effectively lowers the fuel nozzle temperature below the coking threshold. RBS can operate for a maximum of 1 hour, and its effectiveness depends on ambient conditions (especially ambient temperature) and the total duration it runs. The last flight of the day contributes the most to fuel nozzle coke accumulation because of the extended dwell time at the gate. By actively managing post-shutdown thermal conditions, RBS significantly reduces coking-related problems, improves engine reliability, and lowers long-term maintenance costs. Now, also coming soon to the CFM56

As the CFM LEAP engine shuts down, you can hear the distinctive “whoosh” sound followed by a gush of air. That is the Reverse Bleed System (RBS) at work. During normal operation, a significant amount of fuel remains unpurged in the system after engine shutdown. This residual fuel, located near or within the hot section, vaporizes due to high temperatures and deposits carbon (coke) on the fuel nozzles. Over time, nozzle coking leads to several operational and maintenance issues, including loss of thrust, reduced engine efficiency due to incomplete combustion, accelerated deterioration of hot-section components (combustor and High-Pressure Turbine), engine start failures, potential engine stalls, and increased unscheduled engine removals. The Reverse Bleed System (RBS) prevents fuel nozzle coking by automatically introducing cool air from the core compartment into the engine core flowpath after shutdown. This effectively lowers the fuel nozzle temperature below the coking threshold. RBS can operate for a maximum of 1 hour, and its effectiveness depends on ambient conditions (especially ambient temperature) and the total duration it runs. The last flight of the day contributes the most to fuel nozzle coke accumulation because of the extended dwell time at the gate. By actively managing post-shutdown thermal conditions, RBS significantly reduces coking-related problems, improves engine reliability, and lowers long-term maintenance costs. Now, also coming soon to the CFM56

Arjun Singh

53,644 Aufrufe • vor 4 Monaten

Gnome Omega (1909) - The Engine That Spun Aviation Forward In 1909, the Gnome Omega became the first mass-produced rotary engine, marking a major breakthrough in early aviation. At a time when aircraft struggled with heavy, unreliable, and overheating engines, Gnome introduced a radical solution: instead of the crankshaft turning, the entire engine-cylinders and all-rotated around a fixed crankshaft. This spinning design dramatically improved air cooling, eliminating the need for complex radiators, while also delivering an excellent power-to-weight ratio-a critical advantage for the fragile aircraft of the era. The Omega quickly powered some of the most important pioneers of flight, including aircraft used by Louis Blériot during the early days of aviation, helping push the limits of what was possible in the sky. Rotary engines would eventually be replaced by more efficient inline and radial designs, but for a crucial moment in history, they were the cutting edge of flight technology.

Gnome Omega (1909) - The Engine That Spun Aviation Forward In 1909, the Gnome Omega became the first mass-produced rotary engine, marking a major breakthrough in early aviation. At a time when aircraft struggled with heavy, unreliable, and overheating engines, Gnome introduced a radical solution: instead of the crankshaft turning, the entire engine-cylinders and all-rotated around a fixed crankshaft. This spinning design dramatically improved air cooling, eliminating the need for complex radiators, while also delivering an excellent power-to-weight ratio-a critical advantage for the fragile aircraft of the era. The Omega quickly powered some of the most important pioneers of flight, including aircraft used by Louis Blériot during the early days of aviation, helping push the limits of what was possible in the sky. Rotary engines would eventually be replaced by more efficient inline and radial designs, but for a crucial moment in history, they were the cutting edge of flight technology.

Mechanical Knowledge

17,843 Aufrufe • vor 2 Monaten

The SR-71 Blackbird converts supersonic air to subsonic speeds using a movable, conical "spike" in the engine inlet that generates a series of shock waves, slowing air from over Mach 3 to roughly Mach 0.4 before it reaches the compressor. This process, crucial for the J58 engine, transforms high-speed, low-pressure air into high-pressure air at a manageable speed, generating a majority of the total thrust. Mechanism for Slowing Air •Inlet Spike Position: The sharp, cone-shaped spike moves up to 26 inches backward as the aircraft accelerates, optimizing shock wave alignment. •Oblique Shock Waves: At supersonic speeds, the spike produces a series of angled oblique shock waves that slow and compress the air. •Normal Shock Wave: A terminal shock wave forms at the inlet mouth, effectively slowing the air to subsonic velocity. •Variable Geometry: The inlet computer automatically manages the spike position and bypass doors to prevent "inlet unstart"—an immediate loss of thrust caused by shock wave misalignment. Benefits and Components •Pressure Conversion: The inlet acts like a "garden hose in reverse," where the reduction in speed is converted into massive pressure increase. •Subsonic Compression: The engine itself is a turbojet, which can only function on subsonic air. •Bypass Air: Excess air is bled off and reintroduced at the exhaust, adding more efficiency and thrust. •YouTube : How the Lockheed SR-71 Blackbird works by Amimagraffs

The SR-71 Blackbird converts supersonic air to subsonic speeds using a movable, conical "spike" in the engine inlet that generates a series of shock waves, slowing air from over Mach 3 to roughly Mach 0.4 before it reaches the compressor. This process, crucial for the J58 engine, transforms high-speed, low-pressure air into high-pressure air at a manageable speed, generating a majority of the total thrust. Mechanism for Slowing Air •Inlet Spike Position: The sharp, cone-shaped spike moves up to 26 inches backward as the aircraft accelerates, optimizing shock wave alignment. •Oblique Shock Waves: At supersonic speeds, the spike produces a series of angled oblique shock waves that slow and compress the air. •Normal Shock Wave: A terminal shock wave forms at the inlet mouth, effectively slowing the air to subsonic velocity. •Variable Geometry: The inlet computer automatically manages the spike position and bypass doors to prevent "inlet unstart"—an immediate loss of thrust caused by shock wave misalignment. Benefits and Components •Pressure Conversion: The inlet acts like a "garden hose in reverse," where the reduction in speed is converted into massive pressure increase. •Subsonic Compression: The engine itself is a turbojet, which can only function on subsonic air. •Bypass Air: Excess air is bled off and reintroduced at the exhaust, adding more efficiency and thrust. •YouTube : How the Lockheed SR-71 Blackbird works by Amimagraffs

Habubrats SR-71

71,946 Aufrufe • vor 4 Monaten

Russia is secretly helping Iran develop technology for supersonic cruise missiles that could potentially threaten U.S. aircraft carriers and other warships in the Middle East - Financial Times The cooperation is part of a secret multi-year program codenamed C430L that began in 2023 and has continued during the ongoing conflict involving Iran, the United States and Israel. It's main purpose is to help Iran to develop a ramjet propulsion system, an engine that allows a cruise missile to sustain flight at several times the speed of sound. Missile and military experts told the FT that the technology was almost certainly intended for anti-ship and land-attack cruise missiles. Iran has developed and flight-tested a ramjet engine, but there is no evidence that a cruise missile developed with Russian assistance has been deployed. However, negotiations over C430L were still continuing this summer, the leaked correspondence showed. "For the Iranians, this would provide a qualitatively new strategic weapons system capable of threatening U.S. Navy ships," former CIA military analyst Jim Lamson told the FT.

Russia is secretly helping Iran develop technology for supersonic cruise missiles that could potentially threaten U.S. aircraft carriers and other warships in the Middle East - Financial Times The cooperation is part of a secret multi-year program codenamed C430L that began in 2023 and has continued during the ongoing conflict involving Iran, the United States and Israel. It's main purpose is to help Iran to develop a ramjet propulsion system, an engine that allows a cruise missile to sustain flight at several times the speed of sound. Missile and military experts told the FT that the technology was almost certainly intended for anti-ship and land-attack cruise missiles. Iran has developed and flight-tested a ramjet engine, but there is no evidence that a cruise missile developed with Russian assistance has been deployed. However, negotiations over C430L were still continuing this summer, the leaked correspondence showed. "For the Iranians, this would provide a qualitatively new strategic weapons system capable of threatening U.S. Navy ships," former CIA military analyst Jim Lamson told the FT.

Anton Gerashchenko

91,689 Aufrufe • vor 18 Tagen

A pickle jar can function as a tiny jet engine. The setup is simple: a glass jar with a small hole in the lid holds a volatile fuel like methanol, which evaporates to create a fuel and air mixture inside. A flame brought to the hole ignites it, and the cycle begins. Here is what happens in each pulse. Combustion sends a sharp pressure spike through the jar, forcing hot gas out the lid hole as thrust. The escaping gas creates a brief partial vacuum inside, which pulls fresh air back in through the same hole. Residual heat ignites the new mixture automatically, and the cycle repeats dozens to hundreds of times per second. The jar and hole act as a resonant cavity, which is why it pulses instead of burning steadily. A single opening cannot handle exhaust and intake at the same time, so the system locks into a natural rhythm. It produces almost no real thrust, but it is a clear window into how actual pulsejet engines work, and the physics on display are the same ones used in real aerospace propulsion. Follow for more!

A pickle jar can function as a tiny jet engine. The setup is simple: a glass jar with a small hole in the lid holds a volatile fuel like methanol, which evaporates to create a fuel and air mixture inside. A flame brought to the hole ignites it, and the cycle begins. Here is what happens in each pulse. Combustion sends a sharp pressure spike through the jar, forcing hot gas out the lid hole as thrust. The escaping gas creates a brief partial vacuum inside, which pulls fresh air back in through the same hole. Residual heat ignites the new mixture automatically, and the cycle repeats dozens to hundreds of times per second. The jar and hole act as a resonant cavity, which is why it pulses instead of burning steadily. A single opening cannot handle exhaust and intake at the same time, so the system locks into a natural rhythm. It produces almost no real thrust, but it is a clear window into how actual pulsejet engines work, and the physics on display are the same ones used in real aerospace propulsion. Follow for more!

Mechanical Knowledge

131,156 Aufrufe • vor 6 Monaten

I have something very special to share today! This is a hardware capture of maximqad's port of the Xash3D engine--which is compatible with the Half-Life engine--running on the Sega Dreamcast... ONLINE! Keep in mind this is EXTREMELY early in the days of the port, with no DC-specific graphics optimizations or hardware accelerated math routines yet, so performance still has a lot of room to drastically improve. Audio was literally just barely moved to the SPU for the first time just the other day too, so this is still all very incredibly new... ...but here it is! The engine that wouldn't even run without being on an emulator that also needed to emulate the extended 32MB RAM modification... now running on a stock Sega Dreamcast with online multiplayer connectivity and mouse and keyboard support! Fantastic work from maximqad! I really believe as this engine matures, it will be an incredibly powerful tool for Dreamcast developers and will potentially bring a lot of new software to the platform in the form of Half-Life engine mods!

I have something very special to share today! This is a hardware capture of maximqad's port of the Xash3D engine--which is compatible with the Half-Life engine--running on the Sega Dreamcast... ONLINE! Keep in mind this is EXTREMELY early in the days of the port, with no DC-specific graphics optimizations or hardware accelerated math routines yet, so performance still has a lot of room to drastically improve. Audio was literally just barely moved to the SPU for the first time just the other day too, so this is still all very incredibly new... ...but here it is! The engine that wouldn't even run without being on an emulator that also needed to emulate the extended 32MB RAM modification... now running on a stock Sega Dreamcast with online multiplayer connectivity and mouse and keyboard support! Fantastic work from maximqad! I really believe as this engine matures, it will be an incredibly powerful tool for Dreamcast developers and will potentially bring a lot of new software to the platform in the form of Half-Life engine mods!

Falco Girgis

17,371 Aufrufe • vor 1 Jahr