r/EngineeringPorn is a subreddit with 1.4M members. The most common kinds of discussions are solution requests and ideas, and the community frequently discusses engineering, technology, innovation, mechanical, and mechanism.
Popular Themes in r/EngineeringPorn
#1
Solution Requests
: "Silver Swan Automaton… no motors, built in 1773 and still working perfectly. powered entirely by mainsprings and brass clockwork gears."
4 posts
#2
Ideas
: "I built a removable, motorized H-gate manual shifter for a paddle-shift Ferrari. CAN bus integration, no modifications to the car"
4 posts
#3
Self-Promotion
: "Spent a year building this transforming drone, now I'm open sourcing it"
2 posts
#4
Advice Requests
: "In 1970, during a severe snowstorm in Czechoslovakia, railroad workers used the jet engine of a MiG-15 fighter jet to defrost frozen railway tracks, an inventive solution that kept critical transportation running despite extreme winter conditions."
1 post
Popular Topics in r/EngineeringPorn
#1
Engineering
: "My biggest 3D Printed Engineering project!"
57 posts
#2
Technology
: "a book of interlocking gears"
28 posts
#3
Innovation
: "a book of interlocking gears"
15 posts
#4
Mechanical
: "Cams act as the Mechanical memory of the machine.
Jacques de Vaucanson realized that by placing hundreds of tiny, precisely shaped cams onto a single rotating cylinder , he could create a complex Mechanical code."
15 posts
#5
Mechanism
: "Compliant-Mechanism Mattress for Preventing Pressure Ulcers"
13 posts
#6
Aviation
: "HMS Queen Elizabeth in the North Atlantic"
10 posts
#7
Design
: "Omni-Wrist VII — cables replaced with rotating shafts. Singularity-free Design. Mark Rosheim"
10 posts
#8
Machinery
: "Changeover from Figaro's Wedding to Romeo & Juliet involves Machinery and some handwaving."
9 posts
#9
Robot
: "A Robot, that picks up balls and shoots them into a container."
9 posts
#10
Aircraft
: "The Stratolaunch "Roc" is the world's largest Aircraft by wingspan (385 ft—longer than a football field). Designed as an airborne launch pad, the massive twin-fuselage plane is powered by six Boeing 747 engines and can carry up to 500,000 lbs under its center wing. Credit:Photos from JetPhotos"
9 posts
Member Growth in r/EngineeringPorn
Yearly
+81k members(6.0%)
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Last updated: June 22, 2026