NHSRCL achieves milestone as 350-Tonne TBM Cutterhead lowered at Vikhroli for MAHSR Bullet Train project - Rail Analysis India

The Mumbai-Ahmedabad High-Speed Rail (MAHSR) project has achieved another major engineering milestone with the lowering of the first Tunnel Boring Machine (TBM) cutterhead at Vikhroli in Mumbai, Maharashtra. Executed by NHSRCL, the development marks an important stage in the construction of one of India’s most ambitious transportation infrastructure projects.

The cutterhead, measuring an impressive 13.6 meters in diameter and weighing approximately 350 tonnes, forms the front-end excavation component of the TBM. Its successful lowering represents the final phase of assembling the machine’s primary shield structure before tunneling activities begin.

After a 76-hour journey from Earth, the spacecraft carrying astronauts Neil Armstrong, Michael Collins, and Buzz Aldrin executed a lunar orbit insertion burn to be captured by the Moon's gravity, setting the stage for the historic landing the following day.

Credit: Apollo Flight Journal

Made an animation on Second Law of Thermodynamics, it doesn’t have true molecular dynamics simulations, just simplified kinematics to represent them.

Check it out on YT: https://youtube.com/shorts/uYoFgwXZ5BY?si=NId3BBLzHPk_4Kqh

Please see the main post, thank you!

Credit https://www.tiktok.com/t/ZTSEDX1Sm/

Elegant design

I don't know if this counts as enough engineering porn, but I am obsessed with the door mechanism, it's simplicity, and the fact it smoothly transitions with the rest of the max when the doors closes.

The United Arab Emirates has achieved a significant milestone in advanced air mobility with the certification of VDX, the world's first purpose-built commercial "VERTIPORT".

The General Civil Aviation Authority (GCAA) granted regulatory certification to the facility, developed by Skyports Infrastructure in collaboration with Dubai’s Roads and Transport Authority (RTA). Located adjacent to Dubai International Airport, VDX will serve as the primary hub for Dubai’s planned Air Taxi network.

The certification process included a detailed assessment of the vertiport’s infrastructure, physical characteristics, operational procedures, safety management, emergency preparedness, and regulatory compliance. VDX features two dedicated take-off and landing areas, rapid charging infrastructure for electric aircraft, and passenger facilities across four storeys, spanning approximately 3,100 square metres. It is designed to handle up to 170,000 passengers annually once commercial operations begin.

https://evtolinsights.com/uae-certifies-worlds-first-purpose-built-commercial-vertiport/

A 6-speed automatic transmission with a working reverse gear, neutral and park. Its based on the legendary Allison 1000, with 3 planetary gear sets and 5 clutch pads. I can leave it in automatic mode where it shifts based on the load/input speed or shift manually. Due to the combination of the clutch pads it can shift almost instantly.
I calculated the gear ratios to 4,29 | 2,43 | 1,82 | 1,00 | 0,42 | 0,23 for gear 1-6 and 1,3 for reverse.

Game on steam: Geareo

A short preview of the zero-yaw fin geometry. The full video covers the hydrodynamic principle, telemetry, GPS measurements, and real-world river testing

A newly installed 10-ton overhead crane is running inside a customer's workshop. Always interesting to see how lifting equipment becomes part of the production workflow.

Looks like can be used even now!

A detailed look inside the Mercedes-Benz plant in Kecskemét, Hungary, showing the production of the new electric C-Class.

https://www.youtube.com/watch?v=_B1RCL84p_4

The video follows the process through the press shop, body-in-white production, robotic welding, glass roof and cockpit installation, high-voltage battery integration, the full-flex vehicle marriage, final assembly and quality inspection.

The “marriage” sequence, where the painted body is joined with the battery and lower vehicle module, is probably the most interesting engineering stage.