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Charlie K .... thanks for writing about your search for further evidence.

Are you saying ... with a separate ignition circuit, the ignition can be
turned on at a later but higher starting rpm?

Are you also saying this would allow the crank to have more inertia so that
the impulse circuit is not so likely to induce a kick back?

If this is true ... what happens if, because of low starting rpm, there is
not enough inertia to produce the desired point to switch on the ignition.

I don't see how a separate ignition switch would produce a different result.
Consider the case of low starting rpm caused from a low battery, or bad
connections, or cold soaked, or for whatever reason.

It seems, at times,  the kick back threat would exist even with a separate
ignition switch.  What am I missing?

Isn't electronic ignition designed to produce a spark later ... at or closer
to TDC of the piston, and automatically senses when spark should be
introduced for starting?

RPM, SPARK, FUEL has been a way of life with the jet engines but for
different reasons.

How do only two hands CRANK, IGNITE, PRIME without a flight engineer or
copilot?  Inquiring minds want to know.

Thanks in advance ...
Jerry Grimmonpré     LNC2

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