Joseph Martin Engineer

I like to share my engineering knowledge in an easy and simple way. YouTube Channel 👇

[Joseph Martin Engineer @JMartinEngineer]

How do machines really work? We rebuild real machines in 3D, piece by piece, and slice them open so you can see what no camera can.

New machines every week. What should we build next?

#engineering #3danimation

[Joseph Martin Engineer @JMartinEngineer]

How does this engine run on a cup of coffee?
A disc shuttles the same air: on the hot plate it expands and pushes the piston out, on the cold plate it contracts and the piston comes back.
All it needs is about a 40°F gap.
Our 3D model; timing illustrative.
#Engineering #Physics

[Joseph Martin Engineer @JMartinEngineer]

The only way to finish installing this bolt is to break it 🔩 A thin steel neck shears at a set torque and leaves a smooth cone with nothing to grab. #engineering #bolt #howitworks #mechanism

[Joseph Martin Engineer @JMartinEngineer]

The harder it falls, the harder it grips 🛗 A spinning wheel and a few steel wedges are what catch a falling elevator. #elevator #engineering #howitworks #mechanism

[Joseph Martin Engineer @JMartinEngineer]

They steered a jet with only the throttles.
United 232, 1989: no hydraulics, no rudder, no ailerons. More thrust on the left swung the nose right. 44 minutes. 184 survived.
Pilots: ever flown throttles-only in the sim?
#Aviation #Engineering

[Joseph Martin Engineer @JMartinEngineer]

Your chairlift stops 40 feet up and won't restart. Here's what's built in for that moment, from spring brakes to a backup diesel to ski patrol with a rope. 3D breakdown:

[Joseph Martin Engineer @JMartinEngineer]

How did a paper balloon bomb America with no pilot?
Its autopilot was a barometer: when the balloon sank, two sandbags dropped and it climbed again.
Engineers, meteorologists, historians: what would you add?
Our 3D model; timing illustrative.
#WWII #History

[Joseph Martin Engineer @JMartinEngineer]

Every machine in the series is on YouTube 👇
https://t.co/PTQu9U6rCM

[Joseph Martin Engineer @JMartinEngineer]

Why does SpaceX catch rockets instead of landing them?
No legs, on purpose. 13 engines brake, then 3 walk the booster to the tower, and two arms catch it by its lifting pins.
Legs or a catch tower: which would you pick?
#Engineering #SpaceX

[Joseph Martin Engineer @JMartinEngineer]

Curious how other aircraft systems work inside? More 3D Shorts on YouTube 👇
https://t.co/PTQu9U6rCM

[Joseph Martin Engineer @JMartinEngineer]

What really happens when a pilot ejects?
It's not one explosion: a sequence timed to a hundredth of a second. At low speed the parachute is open in under 2 seconds, then the seat lets go of you on purpose.
Pilots and egress techs: what would you add?
#EjectionSeat #Aviation

[Joseph Martin Engineer @JMartinEngineer]

The whole series is on YouTube: one new 3D machine every day 👇
https://t.co/PTQu9U6rCM

[Joseph Martin Engineer @JMartinEngineer]

Why did the king refuse the castle's surrender?
Stirling, 1304: it had surrendered, but Edward I let nobody in until his siege engine, the Warwolf, had hit it.
Carpenters, military historians, siege fans: why did Edward make a surrendered castle wait?
#MedievalHistory #Trebuchet

[Joseph Martin Engineer @JMartinEngineer]

The whole series is on YouTube: one new machine every day 👇
https://t.co/PTQu9U6rCM

[Joseph Martin Engineer @JMartinEngineer]

A tiny metal sticker just weighed this watermelon. How?
The melon bends an aluminum bar by less than a millimeter. A zigzag foil gauge on it stretches, and its resistance rises a fraction of an ohm.
Coil spring or metal bar: which did you picture?
#Engineering #Science

[Joseph Martin Engineer @JMartinEngineer]

How does a truck put on its own snow chains? A spinning wheel pressed on the tire flings six chains under the tread, again and again. Swedish patent from 1978. 3D breakdown: (Footage: Onspot / VBG Group)

[Joseph Martin Engineer @JMartinEngineer]

Like this? A new machine in 3D every day on YouTube 👇
https://t.co/PTQu9U6rCM

[Joseph Martin Engineer @JMartinEngineer]

Why did the SR-71 need two Buick V8s to start?
No starter of its own: a cart with two V8s, 600+ hp, spun up the engine until the jet lit and took over at 3,200 RPM.
Crew chiefs and gearheads: what would you put on that cart today?
#SR71 #Aviation

[Joseph Martin Engineer @JMartinEngineer]

750 power banks, one Tesla. More machines explained in 3D on YouTube 👇
https://t.co/PTQu9U6rCM

[Joseph Martin Engineer @JMartinEngineer]

It takes about 750 power banks to charge one Tesla. A big one holds ~100 Wh; an early Model 3 Long Range pack holds ~75,000 Wh in about 4,400 cells. With losses, closer to 1,000.
Illustrative 3D.
#Tesla #EV

[Joseph Martin Engineer @JMartinEngineer]

How do you move a concrete wall through live traffic? Rollers lift each block, an S-shaped conveyor carries it sideways, and it lands one lane over. No crane, no gap. 3D breakdown: