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Registered Member #1822
Joined: Fri Nov 21 2008, 08:04PM
Location:
Posts: 300
I am looking for a quick and dirty way to ignite a potato cannon from a distance without a complicated reload or a 110VAC source.
My idea was to convert 9VDC to 110VAC by attaching one terminal to a 110:9 transformer and the other to the end of a stranded wire and brush it against a file. This should give some really poor quality AC but, it should be good enough to drive a 2KV MOT and produce an arc.
I must have a cheap and reliable way to remotly ignite mostly for my own safety since I undoubtedly will try stupid dangerous fuels eventually.
Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
What i would suggest is taking a magneto from an old lawn mower, weed wacker, or other small engine. You can wind a primary on a random part of the iron core, maybe about 10 turns or 20 gauge, and discharge a capacitor into it. The capacitor size does not really matter too much. I did this once, with a capacitor charged to maybe 24v and around 100uf, and i got a spark like 3/4 inch long. I used that for my spud cannon. You could use a few series 9v batteries. The higher the voltage, the better.
If you can, just use some high voltage wire, or some wire that is far from anything it could arc from, and use a piezoelectric BBQ ignitor. You can run a couple wires out wherever, and you have virtually unlimited ignitions without needing a power supply. And, it is small and reliable.
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
-camera flash charger with a smaller cap +spark gap to discharge into a pulse transformer/ ignition coil or even a flyback -small DST flyback driver -piezo igniter (I have run these attached to a few meters of wire and seemed to work ok)
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Potato Cannon Ignitor
