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Greetings sir, I'm down to mostly polluting rather than contributing at this point, but just for completeness: I'm interested in mostly single, a few 2-cylinder, and occasionally 4-cylinder engines, that generally produce up to around 20HP, with operational speeds typically in the range...

Umm, not to be contrary, but the physics magic is slightly backwards of that... The current builds in the coil and reaches its maximum once the field saturates. Back-EMF is produced by the changing field while the field is building, and this limits the in-rush current. The ballast resistor is...

Ah - thanks. I had considered the possibility that everyone was working on engines with, i.e., small-diameter crankshafts, and therefore even small rare-earth magnets subtended an adequate angle to create enough on-time at the hall sensor. Not being sure, I thought this might be a valuable...

Exactly. On full-scale hand-cranked engines, you absolutely, only, pull the crank handle around the bottom of the rotation towards you, and you do it with your hand outside the crank handle, palm facing in, thumb beside palm (not wrapped around handle). This at least maximizes the chance that...

Performing a bit of thread necromancy here, and moving a previously point-to-point conversation out here, in case it benefits someone else who scratches their head about this: I'm interested in using this design to make the ignitions on ancient chunks of farm machinery that we use mostly for...