the coil and a spark plug are not a problem....the problem is how to make it spark.
dewalt 14.4 volt batteries will be used to power the contraption.
When it comes to wireing a 12 volt coil...
Obviously for the high voltage circuit you connect the center of the spark plug with an insulated wire, ground the proper part of the spark plug
the low voltage circuit you connect your ground all the time to the proper terminal, then you connect the hot wire to the proper terminal, and when the hot (+) wire is REMOVED from the terminal the spark plug sparks.
What i'm trying to find, is an electronic device that will connect then disconnect the hot wire going to the coil several times per second.
I think the turn signal flasher will work...the old mechanical type that flashes real fast when you have a burned out bulb in the circuit. I would estimate it to flash at 2 or 3 times per second.
Correct me if I'm wrong, Jason, but I don't think you want this thing to be working while you're driving so the tire operated gizmos wouldn't work, correct?
If you had a small propane powerd flame thrower on your bicycle, wouldn't you use it while riding???
I am actually rather amused by the idea of spinning a distributer with the rear tire.......but getting all the geometry correct would be a little difficult..i'm not sure i have the desire to make it bullet proof enough to work everytime. IT is very important to make sure the propane ignites on it's way out of the flame thrower. Unburnt propane floating down toward the operater is less than desirable. Propane is heavier than air. Although it is being used in outside in a well ventilated area, which will certianly help to reduce the danger. I do not remember the LEL and UEL of propane off the top of my head. Natural gas would be a much safer fuel for this setup, but it's difficult to find lng in a bottle. It is used by some city buses and cabs, but not nearly as easy to find as propane.
The propane cylinder (coleman grill size) will be mounted in a safe spot that is easiy accessable to the rider and can be turned off with a quarter turn valve if necessary. The nozzle for the flame will be about 8 feet off of the ground and pointed straight up. The size of the flame should only be about 6 or 8 feet above the nozzle. (as opposed to 30-50 feet for my full size flame thrower)
A super easy and portable electronic ignition would be a tazer, but regular citizens cannot purchase them here in michigan. I think they run off a 9 volt battery or something similar.