Back during WWII, Chrysler bodged five inline-6 engines together to create the powerful A57 multibank tank engine. [Maisteer] has some high-revving inline-4 motorcycle engines he’s trying to put together too, but unlike 1940s Chrysler, he also has a trombone… and a lot more RPMs to deal with.

The Chrysler flatheads were revving at a few thousand RPM– their redline was almost certainly in the three-thousand range. [Maisteer] is working at 15,000 RPM, which is where the real challenge of this build lies: the trombone in the image is just for fun. He wanted to use a heavy chain to link the crankshafts, but at that rotational speed, a heavy chain becomes really heavy— or at least, it feels a force many times its weight due to centrifugal force. The lietmotief of this video is a quote by an automotive engineer to the effect that chains don’t work over 10,000 RPM.

That leads to a few problems for the intrepid “not an engineer” that take most of the video to deal with and ultimately doom the engine linkage– for now. Not before he gets an iconic 8-cylinder sound out (plus some fire) out of a trombone, though. Of particular note is the maker-type workflow Hackaday readers will appreciate: he 3D scans the engines, CADs up parts he needs and sends away to have them CNC’d and SLS printed.

Hacking motorcycle engines into cars is nothing new. Hacking them together into franken-engines is something we see less often.

Thanks to [Keith Olson] for the tip! Remember, if you want to toot your own horn– or toot about someone else’s project, for that matter–the tips line is always open.

It’s been over 10 years since the launch of the excellent The Witcher 3: Wild Hunt, and nearly four years since the announcement of “the next installment in The Witcher series of video games.” Despite those long waits, developer CD Projekt Red is still insisting it will deliver the next three complete Witcher games in a short six-year window.

In a recent earnings call, CDPR VP of Business Development Michał Nowakowski suggested that a rapid release schedule would be enabled in no small part by the team’s transition away from its proprietary REDEngine to the popular Unreal Engine in 2022. At the time, CDPR said the transition to Unreal Engine would “elevate development predictability and efficiency, while simultaneously granting us access to cutting-edge game development tools.” Those considerations seemed especially important in the wake of widespread technical issues with the console versions of Cyberpunk 2077, which CDPR later blamed on REDEngine’s “in-game streaming system.”

“We’re happy with how [Unreal Engine] is evolving through the Epic team’s efforts, and how we are learning how to make it work within a huge open-world game, as [The Witcher 4] is meant to be,” Nowakowski said in the recent earnings call. “In a way, yes, I do believe that further games should be delivered in a shorter period of time—as we had stated before, our plan still is to launch the whole trilogy within a six-year period, so yes, that would mean we would plan to have a shorter development time between TW4 and TW5, between TW5 and TW6 and so on.”

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General Electric has received a contract valued at $9.7 million for the procurement of initial provisioning spares and consumables for the F110-GE-129 engine. The U.S. Air Force Lifecycle Management Center awarded the contract on November 18, 2025. According to the Department of War, the contract supports a Foreign Military Sales (FMS) requirement for the Bulgarian […]

It took the California Science Center more than three years to erect its new Samuel Oschin Air and Space Center, including stacking NASA’s space shuttle Endeavour for its launch pad-like display.

Now the big work begins.

“That’s completing the artifact installation and then installing the exhibits,” said Jeffrey Rudolph, president and CEO of the California Science Center in Los Angeles, in an interview. “Most of the exhibits are in fabrication in shops around the country and audio-visual production is underway. We’re full-on focused on exhibits now.”

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Kratos Defense & Security Solutions, Inc. has opened a new propulsion manufacturing facility in Auburn Hills, Michigan, aimed at accelerating production of its Spartan family of turbojet engines to meet growing U.S. defense demand for affordable, high-volume air power. The 22,500-square-foot facility includes office space, production lines, assembly areas, and a multi-station test cell designed […]

Reinventing Browser Security for the Enterprise The Browser: Enterprise’s Biggest Blind Spot On any given day, the humble web browser is where business happens – email, SaaS apps, file sharing,...

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 Unifying IT Management and Security with ManageEngine In today’s digital landscape, IT can feel like juggling flaming torches, one wrong move and the consequences can be costly. From managing endpoints,...

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