Instructables

The accidental pocket jet engine...

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Yep, that's right a baby jet engine, it takes in air and uses fuel to heat and therefore expand the air, this particular engine is more a functioning model, it produces little thrust in real terms, it is however a lot of fun and makes one interesting ornament, albeit a dangerous one.

Continue on and see, by the way here's a video to go with it.


 
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Step 1: Tools and materials

Picture of Tools and materials
Tools:
*Pliers
*File (possibly avoided)
*A lighter

Materials:
*A metal pen barrel
*The cap of a bic pen
*Some wire (I used bare steel wire)
*A jet lighter nozzle (If you don't have one I'll soon have an instructable showing you how to make one)
*A lighter reservoir (I used one off another jet lighter that had three nozzles, converted it to one for power)

Step 2: Explanations and safety

Picture of Explanations and safety
Ok you are dealing with fire and gas here, so at this point I would like to explain that I take no responsibilty for injury or damage caused by the items shown in this instructable, also if you're under 13 I suggest not doing this at all, just because you're under thirteen, fire may cause rash judgements in males under 50 and females under 16.

Well how this happened... I was making a simple bunsen burner for the pocket instructables and as far as I can tell the new design I came up with affords too much slowing of the air/gas mixture, combined with the fact that the upper casing becomes hot, this meant that the flame reached a critical point and suddenly receded inside and turned in to a jet engine, by putting a tiny nozzle on the end after this may be able to create some thrust.

Again, I accidentally made a jet engine out of a pen.
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freak0vnature8 months ago
could you add fans or turbines to this
how do you ignite the fuel air mixture
techno guy3 years ago
Where can I buy a jet lighter that is cheap and durable?
Homedepot in the welding section for 3$
walgreens for 5
I bought one at a local gas station for around 10 bucks. little reservoir though
killerjackalope (author)  techno guy3 years ago
The funny thing is dollar store ones have pretty much the same innards as more expensive ones - try to get one with a metal body as they tend to have less integrated parts inside.

For your nozzle question, this guy got it before I did...

http://www.instructables.com/id/The-accidental-pocket-jet-engine-parts/

On the other 'ible you asked about making a nozzle for a lighter - I doubt you'd get one to fit and work in a lighter unless you machined one just like a manufactured one...
coonass6 years ago
Hot DAMN! This is unreal! Ever tried putting this on a flat bed HO scale rail car, setting the whole thing on HO rail tracks and re-creating a rocket sled? Just curious. You should be able to put a micro scale of some sort in front of the assembly so the jet sled/rail car pushes against it and allows you to measure your thrust in ounces or grams. In fact, you could calibrate a system like this by cutting the explosive charge off of a model rocket engine, putting THAT on your rail car and measuring the thrust as I described - then comparing that to the rated thrust of the engine. That would give you a comparison. By measuring several different sizes of model rocket engine, you could work out a conversion factor to allow you to calculate the actual thrust from the readings on your scale just by calculating ratios of real thrust to measured thrust. If you're serious, of course, you'd need to burn up several examples of each thrust level model rocket engine to reduce the impact of observational error and/or chance mishap on your calculations. Good work, dude!
The jet here dosen't put out much thrust. Not even enough to move itself
Or use model rockets specifically designed for cars - cutting off the explosive (recovery) charge prevents any thrust, if I remember rightly.
carefull what you do with the explosive charge out of a model rocket engine(specificaly C6-3s and higher). Trust me, I would know that a 3rd degree burn all over the bottom of your hand hurts like hell, and takes really long to heal. Just a word of caution :)
killerjackalope (author)  coonass6 years ago
It's not quite at that stage but soon it will be...
I built one of these out of some gas pipe fitting. And it was quite successful.
I was thinking about using an old 30-06 bullet casing cut to size. might be thick enough to handle the heat better?
I'd say a 30-30 round.
Aron3132 years ago
Thats sick!! put it on a small plane!!!! or do what coonass said!!!!!!
techno guy3 years ago
How do you make a jet lighter nozzle?
bio-logical3 years ago
i can't seem to find any kind of tube in some of the devices you have said like a jet lighter or what not, so is it possible to find them in bar-be-que lighters?
jbman8403 years ago

sarey for the spelling i have dislexeya
your desine is intresting and prity cool i am going to make a jet engine useing and plasma torch you see plasma is som would say is the 4th state of matter and i will spin the plasma with magnetick felds and at the rite speed i will reles it and if all gos well it willl give a woping 66% afishinsee
Ki1o3 years ago
I wonder if it would be possible to make a mini afterburner to add thrust to it.
Tobor 2.03 years ago
every try adjusting it so it creates more thrust
tzq33tdq3 years ago
i've been wondering how to make a jet engine for some time now and i have finally found out how.
killerjackalope (author)  tzq33tdq3 years ago
There are a lot of better options than this one, it's more or less just a model, no serious thrust...

Pulse jets are a cheap way to start...
ceraman3 years ago
is this a really jet engine or just a decorative model? i want to make a practical one. but i think that's not work in this way.
killerjackalope (author)  ceraman3 years ago
This one won't produce serious thrust, for the size and valveless pulse jets probably the best option, I have plans to build a jet engine with useful thrust but at the moment I'm working on some high voltage projects
1154944 years ago
since you know how to make a jet engine i was wondering if you know how to make a mini gasoline engine because i am trying to make one. thanks.
killerjackalope (author)  1154944 years ago
Look at two stroke engines, the simplest type of piston engine if you're going to build one from scratch that's a good place to start.
this is so stupid, all your doing is injecting fuel into a chamber and mixing is with noncompressed air. there is no way this could produce thrust. All you've made is a lighter even with components from a lighter. I don't see why any of you think this is cool. go make an explosive or something.
(removed by author or community request)
^flagged for stupidity
 I made an instructable partially because so many people don't really understand jet engines as you imply. It shows people what all is needed in primitive and advanced jets. Not to mention, what constitutes a jet engine at all.
agreed
1 this is not "just" a lighter. if does not produce any thrust what so ever, it is still cool bcause it is a lighter on steriods. 2 explosives are illegal this is not
fly_boy_bc4 years ago
Um... Jet engines have thrust. This is NOT a jet engine it is a camp stove or cigarette lighter. Suggestion :read read read. There ARE working jet engines AS SIMPLE AS THIS ONE but they actually produce thrust. No moving parts required. It's called a ram jet but I would reccomend a pulsejet since it has STATIC thrust.
Why are the pictures not showing!!!!!!! I'm trying to build one but I cannot see how you did yours.
Pyro-crazy5 years ago
Here are the new nozzle pictures again. Do you think these will work?
the images
PICT9350.JPGPICT9353.JPGPICT9349.JPG
rug Pyro-crazy4 years ago
how does those work if u could have a look and answer a questain i posted on how does a jet lighter work . thanks
if you jb weld a nut the size of the threads on the to the back it would make fo and easy removal, but it might eventualy burn up and fall off, if you know how and have the tools you cloud weld it on
killerjackalope (author)  Pyro-crazy5 years ago
Perfect looking one, looks just like the original ones I used, see the hole in the cross section, that's the one that needs to be outside the barrel with only the hole where the mixed gas and air comes out inside. Any objects you can find that stand the heat and make a good shape are game for experimentation, some people had luck with spent Co2 capsules by drilling holes in them - click view all comments and look at them for a few ideas.
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