Any spark will ignite the cannon. For an RC plane I would suggest using the electronics contained in a car plug in ionizer as a high voltage source. http://www.asia.ru/images/target/photo/50450965/... more
Hi, First of all let me star off by saying that this device is ingenious, it is amazing to see how you really can make anything out of typical household items...So I thank you for that. Second of ... more
Can I make this from standart lighter? ”
Thanks! ”
Great video!! ”
Hydrogen gas has been a front runner in the alternative fuel debate for decades now. It is plentiful, inexpensive, and the only byproduct of its combustion is water vapor. In the following video, I... more
that's a nice practice !!! ”
Used this for a class I offer to 5th graders. Its very important that you get a soft spring. Hard spring will tend to bend the eraser. The trip wire is virtually impossible to make. I did not make ... more
The exploding ashtray prank was once fairly commonplace long before the Internet was born. Using flash cotton to create a startling explosion, this prank is certainly effective at getting a reactio... more
can you substitute the twine for string? ”
Now to make a shoulder mounter one. ”
Great video! ”
Very cool. Much more effective than the old water-pressure bottle rockets I've made. ”
This week, I've been working on a project that sort of takes a spin off an old-style potato gun. Using PVC pipe and the rapid combustion of hairspray, we can launch a rocket hundreds of feet into t... more
Yeh,....That's pretty cool. Now all you have to do is hook a bike pump up to the fill valve and leave it connected. Hook to the back pack some how and when you start to run out, just start pumping ... more
That's not bad. Actually better than I was thinking. Thanks. ”
Very clever. ”
Hundreds and hundreds for sure. Peak pressure drops within a few seconds, but it will fire at a steady pace for 15 or 20 seconds after that. ”
This is great. The first one is so simple. How many BBs can the "flamethrower" version shoot before the PVC tank needs refilled with air? ”
Last week, I introduced a project that demonstrated how a BB machine gun could be made out of a soda bottle using only a handful of readily available parts. If you missed it, you can check out that... more
Yes, that would be fine. ”
Great stuff to try with my grandkids (and my son). The kids love that granny likes to try neat stuff like this. Nice to have the material so available for me. ”
lol! well it wouldnt be the first time that's happened to me. Could a pvc container in the place of the pop-bottle work just as well? ”
Why thank you. Be sure when you try it to use a pressure rated bottle from a carbonated beverage or you might have the same issue you did with your pulse jet. Not that a water bottle bursting would... more
this is so awesome! great tutorial. I tried to make something like this, but using a pulsejet engine concept and a potato gun. needless to say...it blew up. but i shall try this air compressor meth... more
In a previous article, I showed how to make a powerful airsoft BB machine gun with a portable air supply using about $50 worth of PVC and air fittings. For this project, I have simplified the desig... more
Very cool, glad it worked out for you. ”
this is pretty nifty. i just completed it and my girls love it. i had to substitute the twine with yarn tho but it works great :) ”
Sweet! ”
At a very early age, I would go on summer camping trips. I remember every night being handed a pack of sparklers that were my own, to swing around wildly, which gave me many valuable life lessons o... more
The current does actually have quite a bit to do with igniting the gas. The piezo could have high enough voltage to jump a large gap but if it does not have enough current it will not be a hot enou... more
Well, yes, piezo in my cannon is probably has got lower voltage (I'm pretty sure that current doesn't have to do anything with burning the gas). I'm not sure, just found some lighter at home, maybe... more
Yes, it would work. It would be a poor choice though for the same reason that it is a good choice in the mini cannon, it would take a ton of it in order to bring the chamber up to the proper fuel/a... more
thank you. i am now, conversely wondering if alcohol works well in a potato gun. ”
I have tested dozens of fuels in these mini cannons. The largest issue is finding one that can be added in consistently small quantities to make a combustible mixture inside such a small chamber. A... more
I would guess you're having one of two problems. Either you're using too little alcohol, or the igniter is not producing enough current. If the spark gap between the screws is particularly large th... more
I am curious about the sensitivity to the quantity and quality of propellant used. Have you tested other propellants like hairspray or WD40? And how did you conclude that 90% isopropyl alcohol is y... more
I've made it with this tutorial, but I've got a problem. Gas seems to explode very rarely, only 1/20 "launches" are successful, what is the problem? I didnt buy BBQ lighter, took piezoelectric elem... more
Very cool, I've got to try this sometime! ”
Oh I see.... Thanks! ”
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