|
|
Post by DevourThePain on Aug 21, 2003 2:25:59 GMT -5
I'm currently in the process of making the worlds most powerful combustion type spud cannon.
Anyways, doesn anyone know of any way that i could make an electircal igniter that i can have on a cord?
I'm thinking that having a sparkplug screwed into the combusion chamber with about 20 feet of wiring attached to it so that i dont have to stand right next to the thing. ya know, have a momentary switch with a powersource on one end of the wiring and on the other end will be a spark plug that has a nice hot spark that'll jump. Anyone have any other ideas as the spark plug idea is gonna be a real bitch to get to even work, much less properly.
Oh and incase anyone was wondering, it'll shoot a spud at ATLEAST 750 feet per second. top speed would be around 2000 feet per second.
|
|
|
|
Post by T. Wedd on Aug 21, 2003 9:16:58 GMT -5
Everything you need for an ignition system can be found on a car.
Try using a spark plug, coil, battery and a switch.
Just tap a thread in the combustion chamber and mount the plug, then attach a distributor lead.
From there just run the lead to a coil and locate this all at the source of the device. Then run as much power lead for a safe distance and attach it to the battery and a toggle switch.
This set up should work good enough.
|
|
|
|
Post by DevourThePain on Aug 21, 2003 23:07:50 GMT -5
That's what I was thinkin about doin but luggin around a battery and all would just make luggin around the already heavy (something near 80 pound) cannon more of a pain.. Oh well. all i really care about is how well it works, and ooooooooooh damn will it work. i just hope the cops dont get called. getting into trouble for noise polution and such could be more of a pain in the ass than carrying all the stuff around...
|
|
|
|
Post by ZBoxDemon on Aug 22, 2003 1:38:19 GMT -5
i have always been a fan of pneumatic spud guns. They can hurl spuds up to a mile I believe. Some of the more powerful ones can.
|
|
|
|
Post by DevourThePain on Aug 22, 2003 2:17:16 GMT -5
aaaaah yes. pneumatic cannons are fun and powerful but theyre quiet. i like to have a bang accompanied by massive damage to the target which can only come from the combustion cannon ;D. im gonna have to have earplugs the size of pillows so that i dont go deaf when i start fireing this damn thing. my ears ring from filling my little potato cannon with hydrogen so i can imagine that having a cannon thats 5 times as big can only be louder especially when full of an oxygen/fuel mix instead of a regular ole fuel like hairspray or hydrogen ;D ;D ;D
|
|
|
|
Post by ZBoxDemon on Aug 22, 2003 18:44:08 GMT -5
The problem with combustable fuels is eventually a layer of the stuff builds up on the barrel after a few launches. And then it fouls your spuds and damages the tubing  . So I therefore advocate the pneumatic spud gun. The spud snipers weapon of choice ;D ;D. |
|
|
|
Post by DevourThePain on Aug 23, 2003 21:53:01 GMT -5
Oh, dun get me wrong. I'll always love my pneumatic cannon. I'm just tryin to break records at the moment  Buildup only occurs ehen youre using things such as hairspray. when you use oxygen, hydrogen, butane, and propane like things the only thing you get after the combustion is condensation which can be fixed rather quickly by simply running a rag down the barrel to dry it. I do like pneumatics though. i've sniped little kids on their bikes with grapes from mine. the neighbors dog got shot a couple of times with paintballs also because it was barking at like 2 in the mornin and wouldnt shut up. In that case, the silence from the rather powerful cannon was very much appreciated ;D |
|
|
|
Post by KaRMa on Sept 3, 2003 23:38:27 GMT -5
mhmmm.... dont use the spark plug from a car, it can use YOU as a ground, and stop your heart... i suggest taking the ignition part out of a propane bbq, no battery, and its much smaller
|
|
|
|
Post by DevourThePain on Sept 4, 2003 20:51:39 GMT -5
problem is, that i dont want to have my hands on the cannon. Id really rather not be within 10 feet of the thing while im shooting it. Can the wireing from a piexo multiple spark bbq switch be lengthened by around 8 feet? if so then thats probably what im gonna do. I just dont want to spend the 10 bucks buying the thing if its not gonna work. Id really rather not use a coil and spark plug and such but as of now thats all i can do unless the bbq igniter cord can be lengthened by a good ways.
|
|
|
|
Post by KaRMa on Sept 13, 2003 1:12:12 GMT -5
hmmm, now that i think about it, i probably wouldnt want to be too close either (at least for test runs).
the only thing is, that a spark plug from a car can use up to 35,000 volts, and 300 amps. thats a hell of a lot of energy, and can be fatal. i suppose if safety precautions are made, you could use it, however the plug requires a ground, so you would need a threaded hole in a metal pipe. also, the metal would be able to withstand the outward pressure pushing on the spark plug from the interior. you dont want a plug-rocket from a jammed potato. as for the buildup i believe zbox is referring to is a carbon buildup which will hinder launches, but just make sure to clean it properly after use. this build up is mainly caused by an overly rich fuel mixture, so that quite possibly could be fixed. however, again, i personally suggest the lengthened bbq ignition system (if possible) as long as it can withstand that large amount of outward pressure.
|
|
. So I therefore advocate the pneumatic spud gun. The spud snipers weapon of choice ;D ;D.