A Big Ship Chop Shop On The Georgia Coast

April 4, 2021 by Roger Cheng 16 Comments

Last week we saw a hapless container ship vaulted to fame, where people converged on its combination of mind-boggling size suffering an easily relatable problem of getting stuck. Now that it is moving again, armchair engineers who crave more big ship problem-solving should check out [David Tracy]’s writeup on the salvage operation of an overturned car carrier ship, the MV Golden Ray published by Jalopnik. If the ship’s name doesn’t ring a bell, the writeup opens with a quick recap.

Written for an audience of gearheads, [Tracy]’s writeup walks through some technical aspects of the salvage plan and initial results of execution. Citing from the official entity in charge, the St. Simons Sound Incident Response Unified Command, and augmented with information from elsewhere. Even though the MV Golden Ray is “only’ half the length and a third of the gross tonnage of our meme darling MV Ever Given, it is still a huge ship. Every salvage operation this big is unique, requiring knowledge far beyond our everyday intuition. At this scale, most Internet “Why don’t they just…” comments range from impractical to absurd.

Fortunately, people who actually know how to perform salvage work designed plans, submitted by multiple bidders, each making a different tradeoff in cost and speed among other factors. The chosen plan was to cut the ship into sections small enough to be carried by barge for further processing elsewhere. This required a huge floating crane, a chain pressed into cutter duty, custom fabricated lugs for lifting, and similarly custom fabricated cradles for the barges.

But we all know that no plan survives contact with reality. While this plan was seemingly chosen for speed, it hasn’t gone nearly as fast as advertised. Certainly the pandemic was a huge hinderance, but cutting has also been slowed by pieces built far stronger than spec. Delays also meant more sediment buildup inside the wreck, compounding headaches. Other bidders have started saying that if their plan had been chosen the job would be done by now, but who’s to say their plan wouldn’t have encountered their own problems?

In time St. Simons Sound will be cleared as the Suez Canal has been. Results of their respective investigations should help make shipping safer, but salvage skills will still be needed in the future. At least this operation isn’t as controversial as trying to retrieve the radio room of RMS Titanic.

A Practical Electric Motorcycle, Made From A Motorcycling Classic

March 28, 2021 by Jenny List 26 Comments

If you were to try to name the vehicle that brought transport to the world’s masses, where might you start? The Ford Model T perhaps, or maybe the VW Beetle? If this was the direction you took, then we’re sorry to say you aren’t even close. The answer lies in Soichiro Honda’s Dream and its descendants, small cheap and reliable motorcycles that have been manufactured in their many millions in some form continuously for over seven decades, and which have been sold in every country in the world that has any form of road. They may be unglamorous, but if you had to pick a bike to circumnavigate the globe they can be fixed by a local mechanic anywhere on the planet. That little horizontal single-cylinder engine may be reliable though, but it’s hardly green. [David Budiatmaja] has fixed that, by transforming an elderly Honda C70 into an electric motorcycle worthy of a 21st-century city (Indonesian, Google Translate link).

The conversion appears to have achieved wide coverage in the Indonesian motoring press, and there’s more about it in the video we’ve placed below the break (Indonesian, you may have to enable subtitle translation). The C70 has been stripped of its fairing, engine, and gearbox, and a wheel motor has been laced into the rear rim. There are three battery packs made from surplus 18650 cells, and an ammo can top box containing most of the electrical wiring. Driven at 72V, it gives a modest top speed that isn’t exactly fast but isn’t too bad on a city bike. A set of trail bike bars replaces the stock ones, and something of a cosmetic makeover has given it a tougher image than your local pizza delivery bike. If it didn’t still sport the C70’s somewhat archaic front forks, it might be easy to mistake it for something else entirely.

If wheel motor motorcycle conversions interest you, this isn’t the first one we’ve brought you.

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You Too Can Be A Railroad Baron!

March 14, 2021 by Jenny List 40 Comments

It’s likely that among our readers are more than a few who hold an affection for trains. Whether you call them railroads or railways they’re the original tech fascination, and it’s no accident that the word Hacker was coined at MIT’s Tech Model Railroad Club. So some of you like us watch locomotive YouTube videos, others maybe have an OO layout tucked away somewhere, and still more cast an eye at passing trains wishing they were aboard. Having a proper railway of one’s own remains a pipe-dream, but perhaps a hardcore rail enthusiast might like to take a look at [Way Out West Blow-in blog’s] video series on building a farm railway.

On a smallholding there is always a lot to be moved around, and frequently not the machinery with which to do it. Using a wheelbarrow or handcart on rough ground is as we can attest, back-breaking, so there’s a real gap in the market for anything to ease the task. So a railway becomes an attractive solution, assuming that its construction cost isn’t prohibitive.

The videos below the break are the first two of what will no doubt become a lengthy series, and deals with the construction of the rails themselves including the sleepers cut with a glorious home-made band saw, and then fishplates and a set of rudimentary points. The rails themselves are off-the-shelf flat steel strip laid upon its edge, and secured to the sleepers by short lengths of galvanized tube. It’s clear this isn’t a railroad in the sense that we might understand it, indeed though it uses edge rail it has more in common for its application with some early mining plateways But assuming that the flat strip rail doesn’t twist we can see that it should be perfectly adequate for hand-driven carts, removing the backbreaking aspect of their moving. It will be interesting to follow this project down the line.

Farm railways haven’t featured on Hackaday before, but your inner rail enthusiast might be sated by the world’s first preserved line.

Continue reading “You Too Can Be A Railroad Baron!” →

Rare Diode Threatens Coast Guard’s Arctic Ambitions

March 14, 2021 by Tom Nardi 164 Comments

The United States Coast Guard heavy icebreaker Polar Star is literally a one-of-a-kind ship. After its sister Polar Sea was deactivated in 2010 it became the most powerful icebreaker in the fleet, and one of only two US icebreakers capable of operating in the treacherous polar regions. The vessel is critical to protecting America’s scientific and economic interests in the Arctic, but according to a recent article in Business Insider, the ship’s age and scarcity of spare parts is making an already difficult mission even harder.

In the article, Captain William Woityra specifically mentions that the ship’s diesel-electric propulsion system is running on borrowed time as the diodes used in its AC/DC rectifier are no longer manufactured. With none remaining in the Coast Guard’s inventory, the crew has had to turn to eBay to source as many spares as possible. But once their hoard runs out, Captain Woityra fears his ship will be dead in the water:

We’ve got a few dozen of these in a box on a shelf, when they’re gone, the ship will not be able to run anymore. It’s really kind of disconcerting … that this ship, and this operation, and the US’s icebreaking presence in the Arctic is reliant on a box of spare parts that … there are no more of.”

The 45 year old ship received a $60 million refit in 2013, but that was only expected to extend the hard-working vessel’s life by 8 to 10 years. There was a proposal for a far more thorough overhaul, one which potentially would have keep the Polar Star in service until nearly 2040; but with an estimated cost of $400 million, Congress decided to go with the more economical stop-gap refit.

This story comes just days after the Air Force announced it’s looking for a few good hackers to help reverse engineer components on its aging fleet of B-2 bombers. Much like the Polar Star’s vintage rectifier diodes, spare parts for the the stealthy aircraft are getting increasingly difficult to find.

While the Air Force has enough money in the budget to get replacements made, the Coast Guard will just have to hope their stock of diodes holds out a little while longer. Congress has already approved the Polar Security Cutter Program, a fleet of next-generation icebreakers designed to be comparable to newer Russian and Chinese vessels. The first of these ships could set sail by 2024, providing the Polar Star some much-needed backup.

[Thanks to Chuckz for the tip.]

Putting The Magic Smoke Back In A Cooked Scooter

March 13, 2021 by Tom Nardi 27 Comments

When [Vitor Melon] found out there was a custom firmware (CFW) available for his Xiaomi Mijia M365 Pro electric scooter that would increase his top end speed, naturally he installed it. Who wouldn’t want a little more performance out their hardware? But while the new firmware got the scooter running even better than stock, he does have a cautionary tale for anyone who might decide to ride their Mijia a bit harder than the fine folks at Xiaomi may have intended.

Now to be clear, [Vitor] does not blame the CFW for the fact that he cooked the control board of his Mijia. At least, not technically. There was nothing necessarily wrong with the new code or the capabilities it unlocked, but when combined with his particular riding style, it simply pushed the system over the edge. The failure seems to have been triggered by his penchant for using the strongest possible regenerative breaking settings on the scooter combined with a considerably higher than expected velocity attained during a downhill run. Turns out that big 40 flashing on the display wasn’t his speed, but an error code indicating an overheat condition. Oops.

After a long and embarrassing walk home with his scooter, complete with a passerby laughing at him, [Vitor] opened the case and quickly identified the problem. Not only had the some of the MOSFETs failed, but a trace on the PCB had been badly burned through. Judging by the discoloration elsewhere on the board, it looks like a few of its friends were about to join in the self-immolation protest as well.

After a brief consultation with his graybeard father, [Vitor] replaced the dead transistors with higher rated versions and then turned his attention to the damaged traces. A bit of wire and a generous helping of solder got the main rail back in one piece, and he touched up the areas where the PCB had blackened for good measure.

A quick test confirmed the relatively simple repairs got the scooter up and running, but how was he going to prevent it from happening again? Reinstalling the original firmware with its more conservative governor was clearly no longer an option after he’d tasted such dizzying speeds, so instead he needed to find out some way to keep the controller cooler. The answer ended up being to attach the MOSFETs to the controller’s aluminum enclosure using thermal pads. This allows them to dissipate far more heat, and should keep a similar failure from happening again. You might be wondering why the MOSFETs weren’t already mounted this way, but unfortunately only Xiaomi can explain that one.

With their rapidly rising popularity hackers have been coming up with more and more elaborate modifications for electric scooters, and thanks to their wide availability on the second hand market, it’s likely the best is still yet to come when it comes to these affordable vehicles.

Raspberry Pi Hitches A Ride In A 1989 BMW Dashboard

March 11, 2021 by Tom Nardi 12 Comments

It probably won’t surprise you to find out that a 1989 BMW 325i doesn’t have much in the way of electronic gadgetry onboard. In fact, what passes for an in-dash “computer” in this vintage Beemer is just a digital clock with a rudimentary calendar function. Not content to waste his precious dashboard space any longer, [Ryan Henderson] used his time in quarantine to replace the clock module with a Raspberry Pi.

Nestled in a custom laser-cut housing is a touch screen LCD module that connects directly to the GPIO header of a Pi Zero. Combined with some Python code, this provides a very slick multipurpose interface for pretty much anything [Ryan] wants. Right now he’s got it hooked up to a GPS receiver so he can figure out things like speed and acceleration, but the only real limit on what this little drop-in upgrade can do is how much code you want to sit down and write.

Thankfully, it sounds like [Ryan] has done a lot of the hard work for you. He’s put together a Python library that allows the user to easily draw analog gauges on the screen. The faces are parametrically sized, and even have custom minimum/maximum marks. Of course if you’d rather just throw some text and images on the screen, that’s accomplished easily enough with existing libraries such as PyGame.

[Ryan] says he’s also working on some code to better integrate the Pi into the vehicle’s systems by way of a Bluetooth OBD2 adapter. In the most basic application that would allow you to throw various bits of engine data up on the screen, but on more modern cars, you could potentially tap into the CAN bus and bend it to your will.

While the physical size and shape of this particular modification is clearly focused on this model and year of BMW, the general concepts could be applied to any car on the road. [Ryan] has recently started a GitHub repository for the project and hopes to connect with others who are interested in adding a little modern ~~complexity~~ convenience to their classic rides.

The reality is that cars become more dependent on their onboard computers with each passing year. Already we’re seeing Tesla owners struggle with cooked flash chips, and things are likely to get worse before they get any better. While undoubtedly there are some that would rather keep their daily driver as simplistic as possible, we’re encouraged by projects like this that at least let owners computerize their cars on their own terms.

Put More Scoot In Yer Scooter

March 9, 2021 by Brian McEvoy 17 Comments

We have a scooter hack that is odd for a couple of reasons. First, the vehicle in question is a Doc Green EWA 6000, a German clone of a Xiaomi M365, so Country stereotypes be darned. Second, it is about increasing the performance, and when we think of scooters, we get hung up on scoot. The link between these peculiarities is the speed limiter Germany requires on all scooters, which the Chinese model lacks. Despite the law, [Nikolaj] wanted a higher top speed and Bluetooth connectivity. Wireless unlocks advanced features, like cruise control, which are absent in the stock model.

The mainboard is responsible for speed control, but that is merely a component, and you can find third-party replacements. [Nikolaj] found a new part with a German forum member’s help, then recorded his work in English for our sake. The speed boost is nice, but the Bluetooth functionality is a massive improvement by itself. If you live in an area where the law doesn’t allow this sort of thing, think before you upgrade. Aftermarket parts aren’t always drop-in replacements, and in this case, the controller and display needed some finessing to fit, so measure twice and buy once.

If tearing into a brand new scooter isn’t for you, consider breathing new life into a retiree, and don’t forget that stopping is the other half of the battle.