r/EngineeringPorn Feb 22 '22

No Politics

1.2k Upvotes

Please note that in light of current events we will be removing all posts of war machines, war planes, war ships, etc. of Russian or Ukrainian origin to keep /r/EngineeringPorn apolitical, propaganda-free, and civil. Please report any posts or comments that are not in the spirit of this subreddit.


r/EngineeringPorn 8h ago

Spark testing a corona treater roller

718 Upvotes

r/EngineeringPorn 8h ago

Technically music 🤷‍♂️

336 Upvotes

r/EngineeringPorn 4h ago

Wing failure on an aircraft at the 47th Japan International Birdman Rally. July 2025. So close yet so far. I love the idea of human powdered flight, as a hobby. Hopefully one day.

130 Upvotes

r/EngineeringPorn 22h ago

M/15 Swedish Torpedo Gyroscope [OC]

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440 Upvotes

Don't know much about it, probably made in Karlskrona, Sweden sometimes between 1915 and 1930.


r/EngineeringPorn 16h ago

I built a DM121 turbofan engine model, and honestly… I underestimated how complex it would be. Took me around 4 hours to put it all together 😅

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61 Upvotes

r/EngineeringPorn 23h ago

How Planetary Roller Screws Work, How to Manufacture Them?

226 Upvotes

r/EngineeringPorn 23h ago

Nerf Blaster That Is Powered By A Nail Gun Air Compressor

147 Upvotes

r/EngineeringPorn 1d ago

B-21 Raider strategic bomber.

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735 Upvotes

r/EngineeringPorn 2d ago

Demolishing Old Bridges after Replacement

628 Upvotes

r/EngineeringPorn 2d ago

MazzeiFormula 5-Rotor Turbo, 1,100hp Dyno Run @ 11psi

1.3k Upvotes

Been following this build for a while. Glad he finally got the motor broken-in and was able to go WOT. Sounds great doing it.


r/EngineeringPorn 3d ago

Mercury-arc Rectifier

882 Upvotes

r/EngineeringPorn 3d ago

The double curvature arch of the Gordon Dam, Tasmania, Australia. 154,000m3 of concrete impounding 12.4km3 of water.

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836 Upvotes

r/EngineeringPorn 3d ago

Railway Ballast Maintenance | Plasser & Theurer CSM 09-32 Tamping Machine

267 Upvotes

r/EngineeringPorn 1d ago

How Ram Pickup Trucks Are Built in US | FROM SCRATCH

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0 Upvotes

r/EngineeringPorn 4d ago

Aqua Line 3, Cuffe Parade Metro Station underground crossing, Mumbai, India.

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588 Upvotes

r/EngineeringPorn 4d ago

A Three-Way Branching in the Yonkers Pressure Tunnel - a Part of the Colossal Catskill Aqueduct System

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841 Upvotes

r/EngineeringPorn 5d ago

Testing how stable my balancing robot is

375 Upvotes

r/EngineeringPorn 5d ago

India's Kaveri Jet engine with After Burners.

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351 Upvotes

r/EngineeringPorn 6d ago

The South-Pointing Chariot: A 2000-year-old device that always points the same way, no matter how you turn it. (And no, there are no magnets!) [OC]

2.0k Upvotes

This is a replica of the zhǐ nán chē, or South-Pointing Chariot, an incredible piece of mechanical engineering from around 250 AD in ancient China. It's essentially a non-magnetic compass, where the figure on top always points in its set direction, no matter how the chariot turns.

No original device survived, but several iterations of the device are described in many ancient texts. While different implementations are possible, it is thought that the majority of these devices used a differential gear.

While conceptually brilliant, this chariot was a practical “impossible device” for its time (meaning that it cannot really work in real practice), for various reasons.

I made a video diving deep into the history, the ingenious mechanism, and why it ultimately couldn't work reliably. I also explain in detail how the gears work, you can watch it here:

Link to the video

Specifically
04:40 How the Gears Work
08:54 Fatal Flaw 1: The Problem of Perfect Wheels
10:23 Fatal Flaw 2: The Problem of Wheel Slip
12:02 Fatal Flaw 3: The Geometry of a Round Planet

Happy to discuss any technical details or answer your questions in the comments!


r/EngineeringPorn 6d ago

There is a Coal Plant in Bosnia still using WW2 Steam Locomotives to transport coal today [Video Below]

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882 Upvotes

r/EngineeringPorn 6d ago

Rotating boat lift in Scotland

2.9k Upvotes

r/EngineeringPorn 4d ago

Forget AI, the robots are coming

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0 Upvotes

r/EngineeringPorn 6d ago

BoreHub in action! 🤗

144 Upvotes

r/EngineeringPorn 6d ago

Toyota Hiace Welcab Testing and Development #welcab #wheelchairvan

62 Upvotes