Cheap Flamethrower Is Predictably Worrying

We’d never criticize somebody for coming up with a creative way to save a few bucks. In truth, pickings would be pretty slim around here if we deleted every project or hack where cost savings was a prime motivator. That being said, there’s still some things you should probably spend a few extra dollars on. You know, the essential things in life that you need to know will be safe and reliable, like your car and…your flamethrower.

While we don’t have any information about what kind of car [Steve Hernandez] is driving, but over on Hackaday.io, he’s posted some info about his 3D printed wrist-mounted flamethrower. The final result does look pretty impressive, but given the subject matter and the lack of any safety gear, we would firmly plant it in the “Don’t try this at home” category.

At the heart of this flamethrower is a solenoid valve recovered from a Glade air freshener. Rather than spraying out the smell of lilacs, this valve has found a new purpose in life by squirting out butane from a pressurized can. The butane is then ignited by a spark gap made up two nails connected to a 300 kV boost coil.

[Steve] designed the frame of this creation in OpenSCAD, and printed it out in a single piece. It holds the butane can and solenoid in position, as well as keeping the nails in the proper orientation for the spark gap to function. Admittedly the head of his printed flamethrower does look very cool, but if there was ever a situation where you should be suspect of the heat tolerance of 3D printed plastic, a flamethrower is probably it.

What’s noticeably lacking of course is any method to keep the flame from potentially traveling back up through the valve and into the butane can. The high-speed flow coming out of the nozzle is probably enough to keep that from happening, but we still wouldn’t feel comfortable strapping his device to our wrist as-is.

You may be surprised to find that wrist-mounted flamethrowers are a relatively popular project here at Hackaday. We’ve covered quite a few over the years, but still aren’t convinced this is something we personally need to add to our collection of gear.

Butter Passing Battlebot

The idea of purpose is one of great importance to many sentient beings; one can only imagine the philosophical terror experienced by a robot designed solely to pass butter. Perhaps wishing to create a robot with more reason to exist, [Micah “Chewy” Leibowitz] decided to build this battlebot armed with a flamethrower, named Flamewar.

In the video, we see it rather successfully facing off against a robot named T800, at least in the early part of the fight. T800 is armed with a spinning weapon, and while it is able to deliver a heavy thump thanks to stored kinetic energy, more often than not T800 seems to knock itself over rather than do any serious damage to Flamewar. Flamewar is repeatedly able to fire its primary weapon, as the flamethrower is built into its arms, far above the reach of T800’s armament. We won’t spoil the ending of the fight. Video below the break.

The robot was built by [Micah] who competes with [Team Tiki], who have documented some of their past builds online. We would like to see some footage of Flamewar actually passing some butter, though. The bout was a part of Robogames 2017, and we’re impressed that such things like flamethrowers are allowed in the rules. Obviously safety is a paramount concern of these events, so it’s awesome to see they’ve found a way to make things work.

If you’re unaware of the dairy product reference, fill yourself in here. We’ve seen other takes on this, too.

We love seeing combat robots here at Hackaday. If you’re thinking about getting started yourself, why not get started with an ant-weight bot to cut your teeth?

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The Pumpkin Noti-Fire

Everyone has an episode somewhere in their youth involving the use of an aerosol spray as an impromptu flamethrower. Take some mildly inebriated teenagers, given them a deodorant can and a box of matches, and sooner or later one or two of them are going to lose their eyebrows.

For most of us an amusing teenage episode is how the aerosol flamethrower remains. Not for [Mike Waddick] though, when last week’s DDoS attack on DNS infrastructure took away his ability to work his, attention turned to a Halloween project. He created a carved pumpkin that spits fire as a notification signal when a text or an email is received.

flame-testKey to the project is the Glade Automatic Spray Air Freshener. This is a battery-powered device with an aerosol can that is operated by either an electronic timer or a push-button switch. Remove the switch, and its line is revealed as an active low trigger for the spray. [Mike] replaced the switch with a line from a microcontroller and put a lit tea-light candle in front of the nozzle for fully controllable (if not entirely safe) flamethrower fun. Early tests proved the concept, so it only remained for the pumpkin to be carved and the system installed.

The microcontroller used in this case was the Lightblue Bean, though almost any similar board could have been put in its place. Notifications were processed via Bluetooth from an iPhone via ANCS (Apple Notification Center Service), which the Bean could query to trigger its fiery alerts. There is a brief video showing the device in action singeing [Mike]’s hand, which we’ve placed below the break.

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Make A Cheap (And Dangerous) Automated Flamethrower

Nothing lights up the night like a quick blast from a flamethrower, but there is a reason why you can’t buy them in the Halloween decoration aisle at Target. They are dangerous, for fairly obvious reasons. [Erco] seems to have no particular fear of death, though, and he shows how you can build a simple flamethrower with a small candle, a servo, Arduino and a can of hairspray. Tresemme Extra Strong Hold, in particular, although we don’t think the exact type matters that much. All he did was to mount the candle in front of the hairspray, then mount the servo so the arm presses the spray head down. The candle does the rest, lighting the highly flammable propellant in the hairspray to produce the flamethrower effect. [Erco] is using four of these, which are co-ordinated to fire in time with music.

This one seems a bit risky. Servos have a habit of locking, and there is nothing stopping these from locking in the open position, or sticking there if the Arduino crashes. A relay or other switch that reverts to an off position when the power is removed would have been more suitable here. Secondly, there is no emergency off switch. [Erco] has wired the Arduino up next to the flamethrower itself, so you are going to have to reach in to disconnect it. That is risky enough, but he also tried a 4-way configuration that would have been impossible to disable in the event of a problem (shown in the accompanying images). Thirdly, there is no fire protection between the can of hairspray and the open flame, so if the spray head melts or fails from the heat, it’s game over. Finally (and most importantly), where are the fire extinguishers? We’d like to hear how you’d build this with safety in mind. Let us know in the comments below.

We’re big fans of flames and explosions: we’ve have seen a couple of Survival Research Laboratory shows and were blown away by their destructive pyrotechnics. But, as SRL head Mark Pauline said in a recent talk, “when things blow up at an SRL show, it’s on purpose”.

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Mad Max Inspired Flamethrower Ukulele

The new Mad Max movie is getting a lot of buzz, and a few people are calling it a modern classic. There’s a flamethrower guitar in the movie, which means it’s time for cosplay accouterments. Our ‘ol buddy [Caleb] loves flamethrowers and poofers, so hacking together a Doof Warrior inspired flamethrowing ukulele was natural for him.

The fuel for this uke is a can of butane actuated with a caulking gun. This setup is actually pretty clever; by removing the locking tab on the caulking gun, butane is released when the gun’s trigger is squeezed, but stops when the trigger is released. The igniter is a simple grill igniter is used to light the gas.

[Caleb] is rather famous for his flamethrowing creations. His life-size fire-breathing piranha plant uses a similar setup to shoot fire.

Video below.

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A Wrist-Mounted Flamethrower? Sure, Why Not?

There are three types of booths at Maker Faire. The first is the strange corporate booth, like Pepsi ‘revolutionizing fluid intake’ or some such nonsense. That one had the longest line of any booth, in case you’re wondering. The second type of booth is the people you would expect to be there – Atmel, TI, and Makerbot all came out in full force.

The third type of booth were a little hard to find. They’re the ‘show and tell’ spirit of Maker Faire, and [Stephen Hawes] was one of the best. Why? Wrist-mounted flamethrower, that’s why.

The flamethrower is fueled with a propane bottle originally meant for a camping stove, with a microcontroller and pot setup taking care of the height of the flame. Buttons underneath [Stephen]’s thumb takes care of the propane flow and tazer-based ignitor. The wrist measurement sensor can rescale to adjust the height of the flame to how far the wearer can move their wrist.

All in all, a great project for the Faire, although we did feel a little sorry for the NYC fire marshal that was assigned to [Stephen] for the entire faire. As an aside, we’re applauding [Stephen] for not referencing whatever comic book character has fire shooting out of his hand.

FLAMEnco guitar

flamenco

[John] says, “I noticed an unfortunate lack of many flamethrower guitars on the web so I filled the need. ” That’s just awesome by us.

This series of guitar-mounted flamethrowers started with a small build, able to shoot a six-foot flame for about 40 seconds. Yes, very theatrical, but not something you’d want to change out after every song. From there the builds progressed to systems with more barrels, more fuel tanks, and a huge system that shoots 18-foot long flames colored with standard pyrotechnic supplies.

It should go without saying that this stuff probably isn’t something you should try at home. That being said, you really have to admire the craftsmanship and tenacity to make a guitar mounted flamethrower. Just don’t bring it to an indoor gig.

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