A Two-Stroke Engine Made From Scratch Using Basic Hardware Store Parts

August 5, 2024 by Maya Posch 15 Comments

A working DIY two-stroke in all of its glory, with the flywheel removed. (Credit: Camden Bowen)

How hard could it to be to build a two-stroke internal combustion engine (ICE) from scratch? This is a challenge that [Camden Bowen] gladly set for himself, while foregoing such obvious wastes of time like first doing an in-depth literature study on the topic. That said, he did do some research and made the design in OnShape CAD before making his way over to the hardware store to make some purchases.

As it turns out, you can indeed build a two-stroke engine from scratch, using little more than some metal piping and other parts from the hardware store. You also need a welder and a lathe, with [Camden] using a Vevor mini-lathe that totally puts the ‘precision’ in ‘chatter’. As building an ICE requires a number of relatively basic parts that have to move with very little friction and with tight tolerances, this posed some challenges, but nothing that some DIY spirit can’t fix.

In the case of the very flexible boring bar on the lathe, improvising with some sturdy metal stock welded to a short boring bar resolved that, and precision was achieved. Together with an angle grinder, [Camden] was then able to manufacture the crank case, the cylinder and crank shaft and all the other pieces that make up an ICE. For the carburetor he used a unit off Amazon, which turned out to have the wrong throat size at 19 mm, but a 13 mm version worked. Ultimately, the first ICE constructed this way got destroyed mostly by running it dry and having the starter fluid acting as a solvent, but a full rebuild fixed all the issues.

This second attempt actually ran just fine the first time around, with oil in the crank case so that the poor engine wasn’t running dry any more. With a 40:1 fuel/oil mixture the little engine idles and runs as well as a two-stroke can, belching blue smoke and making a ruckus. This answers the question of whether you can build a two-stroke ICE with basic machining skills and tools, but of course the question that’s now on everyone’s lips is whether a four-stroke one would be nearly as ‘easy’. We wait with bated breath.

Continue reading “A Two-Stroke Engine Made From Scratch Using Basic Hardware Store Parts” →

Asteroids: Kessler Syndrome Edition

August 5, 2024 by Bryan Cockfield 6 Comments

Asteroids, the late-70s arcade hit, was an immensely popular game. Often those with the simplest premise, while maintaining a fun, lighthearted gameplay have the most cultural impact and longest legacy. But, although it was popular, it doesn’t really meet the high bar of scientific fidelity that some gamers are looking for. That’s why [Attoparsec] built the Kessler Syndrome Edition of this classic arcade game.

The Kessler Syndrome is a condition where so much man-made debris piles up in low-Earth orbit that nothing can occupy this orbit without getting damaged or destroyed by the debris, and thus turning into more debris itself in a terrible positive feedback loop. [Attoparsec] brings this idea to Asteroids by reprogramming the game so that asteroids can be shot into smaller and smaller pieces but which never disappear, quickly turning the game into a runaway Kessler Syndrome where the chance of survival is extremely limited, and even a destroyed player’s ship turns into space junk as well.

To further the scientific accuracy and improve playability, though, he’s added a repulsor beam mechanism which can push the debris a bit and prolong the player’s life, and also added mass effect reactions so that even shooting bullets repels the player’s ship a bit. The build doesn’t stop with software, either. He also built a custom 70s-style arcade cabinet from the ground to host the game.

Asteroids is still a popular platform for unique builds like this. Take a look at a light-vector game using lasers to create the graphics, or this tiny version of the game that uses a real CRT.

Thanks to [smellsofbikes] for the tip!

Continue reading “Asteroids: Kessler Syndrome Edition” →

Embedded Python: MicroPython Toolkits

August 5, 2024 by Arya Voronova 22 Comments

Last time, I talked about how MicroPython is powerful and deserving of a place in your toolkit, and it made for a lively discussion. I’m glad to see that overall, MicroPython has indeed been getting the recognition it deserves – I’ve built a large number of wonderful projects with it, and so have people I’ve shown it to!

Sometimes I see newcomers dissatisfied with MicroPython, because the helper tools they initially pick don’t suit it well. For instance, they try and start out with a regular serial terminal application that doesn’t fit the MicroPython constraints, or a general IDE that requires a fair bit of clicking around every time you need to run your code. In particular, I’d make sure that you know your options no matter whether you prefer GUI or commandline – both have seriously nice tools for MicroPython use!

The main problem to be solved with MicroPython is that you have a single serial port that everything happens through – both file upload and also debugging. For ESP8266/32-based boards, it’s a physical serial port, and for chips like RP2040 and ESP32-S* where a hardware USB peripheral is available, it’s a virtual one – which makes things harder because the virtual port might get re-enumerated every now and then, possibly surprising your terminal application. If you want to upload a program of yours, you need to free up the serial port, and to see the program’s output, you will need to reopen that port immediately after – not a convenient thing to do if you’re using something like PuTTy.

So, using MicroPython-friendly software is a must for a comfortable hacking experience. What are your options? Continue reading “Embedded Python: MicroPython Toolkits” →

Radio Apocalypse: HFGCS, The Backup Plan For Doomsday

August 5, 2024 by Dan Maloney 15 Comments

To the extent that you have an opinion on something like high-frequency (HF) radio, you probably associate it with amateur radio operators, hunched over their gear late at night as they try to make contact with a random stranger across the globe to talk about the fact that they’re both doing the same thing at the same time. In a world where you can reach out to almost anyone else in an instant using flashy apps on the Internet, HF radio’s reputation as somewhat old and fuddy is well-earned.

Like the general population, modern militaries have largely switched to digital networks and satellite links, using them to coordinate and command their strategic forces on a global level. But while military nets are designed to be resilient to attack, there’s only so much damage they can absorb before becoming degraded to the point of uselessness. A backup plan makes good military sense, and the properties of radio waves between 3 MHz and 30 MHz, especially the ability to bounce off the ionosphere, make HF radio a perfect fit.

The United States Strategic Forces Command, essentially the people who “push the button” that starts a Very Bad Day™, built their backup plan around the unique properties of HF radio. Its current incarnation is called the High-Frequency Global Communications System, or HFGCS. As the hams like to say, “When all else fails, there’s radio,” and HFGCS takes advantage of that to make sure the end of the world can be conducted in an orderly fashion.

Continue reading “Radio Apocalypse: HFGCS, The Backup Plan For Doomsday” →

Hackaday Links: August 4, 2024

August 4, 2024 by Dan Maloney 8 Comments

Good news, bad news for Sun watchers this week, as our star launched a solar flare even bigger than the one back in May that gave us an amazing display of aurora that dipped down into pretty low latitudes. This was a big one; where the earlier outburst was only an X8.9 class, the one on July 23 was X14. That sure sounds powerful, but to put some numbers to it, the lower end of the X-class exceeds 10^-4 W/m² of soft X-rays. Numbers within the class designate a linear increase in power, so X2 is twice as powerful as X1. That means the recent X14 flare was about five times as powerful as the May flare that put on such a nice show for us. Of course, this all pales in comparison to the strongest flare of all time, a 2003 whopper that pegged the needle on satellite sensors at X17 but was later estimated at X45.

Continue reading “Hackaday Links: August 4, 2024” →

Detecting Faster Than Light Travel By Extraterrestrials

August 4, 2024 by Maya Posch 73 Comments

The idea of traveling faster than the speed of light (FTL) has been a popular idea long before [Alcubierre] came up with the first plausible theoretical underpinnings for such a technology. Yet even if such an FTL drive is possible, it may be hundreds of years before humanity manages to develop its first prototype. This does however not prevent us from for looking for possible FTL drive signatures in the spacetime around us. Such a concept was recently proposed by [Katy Clough] and colleagues in a recent article (Arxiv preprint).

For a friendly but detailed explanation the PBS Space Time video (embedded below) on the paper comes highly recommended. The gotcha with detecting an FTL warp drive is that it is undetectable until it collapses in some fashion. By simulating what this collapse might look like, the researchers were able to speculate about the properties to look for. These include gravitational waves, which would not be detectable by an existing gravitational wave detector like LIGO, but we might be able to build one that can.

Ultimately we’d be acting on conjecture on what a warp bubble would look like and how it would behave when it collapses so we might just as well mistake something far less intelligent for Vulcans passing through our solar system. It might also be our first sign of extraterrestrial life, possibly ogling some primitive civilization on a Class M planet until it’s ready for First Contact.

Continue reading “Detecting Faster Than Light Travel By Extraterrestrials” →

Homebrew Relay Computer Features Motorized Clock

August 3, 2024 by Tom Nardi 7 Comments

Before today, we probably would have said that scratch-built relay computers were the sole domain of only the most wizardly of graybeards. But this impressive build sent in by [Will Dana] shows that not only are there young hardware hackers out there that are still bold enough to leave the transistor behind, but that they can help communicate how core computing concepts can be implemented with a bundle of wires and switches.

Created for his YouTube channel WillsBuilds, every component of this computer was built by [Will] himself. Each of the nine relay-packed protoboards inside the machine took hours to solder, and when that was done, he went out to the garage to start cutting the wood that would become the cabinet they all get mounted in.

Continue reading “Homebrew Relay Computer Features Motorized Clock” →