im thinking the two nails/screws is a better metherd and what was wrong with the way that guy speaks?? is there some thing im not getting? :laughing3: I come from a forum with a younger population. Im pretty sure both of these guys are just american kids. Translation programs dont translate to word...

Small update: we got fed up and switched our fuel from propane to quick-start (diethly ether and aliphatic naptha). The gun now shoots potatoes a few hundred meters with near 100% reliability.

It cost $5 for a spray can that will probably last longer than anyones interest in the gun.

Crappily apparently. Our spark gaps were probably way too large. There was duct tape on everything (there still is) Anyways the closest we are getting to a spark would be an ignition coil, running off of the same battery. I like the sound of this a lot better. Piezoelectric is way too wimpy. Pretend...

Well we actually tried a match hole, and went through several bbq igniters that broke. Im not sure that you can just buy stun guns that easily up here in Canada. :P. Sure ebay or what have you, But this cost us $0 and the cannon takes like 2 minutes to reload anyways. Its not like we are going to be...

Yes, I discussed this earlier. We originally designed a coil for 12v, which took about 4 seconds to heat up. When we moved to the 17v battery, the same coil heated up in less than 1 second. However, it reached critical meltdown temperature in about 3, and it did not survive the testing phase. The cu...

We worked on it some more today, and built a 'battery box' to house a few switches and a battery. We used a 14-cell, 16.8v Ni-Cd battery. Its rated for 10Ah, but it fully discharges in about a week... making it less useful. Whatever though, you can put a useful charge into it in less than an hour. T...

Thanks for the responses. The AA battery thing was based on prior experience of not being able to power a Nintendo 64, which only requires about 2 amps, off of them. (By the way Im from the benheck.com forums). However I guess a piece of wire is a little less sensitive than a computer :P, and yeah i...

Yes, I found out about that yesterday. However we have reached the end of our budget, until I get a job.

Hello Im new here. For the last year me and my friend Jeff have been intermittently working on a simple combustion cannon made from black ABS (I think) drain pipe. Since I only found this place recently, we learned a lot of stuff by trial and error. As it is now it has a 4" dia. chamber thats about ...