I started thinking about the ongoing discussion of 2nd alternators and redundancy, and the fact that slinging a belt up front on a dual alternator dual belt system is at significant risk for taking BOTH belt driven alternators offline. Which brought up the possibility of mounting something on the prop-side of the engine..

Does anyone have any experience mounting a gear driven alternator attached to/driven by the flexplate gear-ring? Would something along the lines of an 0-200 style permanent magnet alternator be useable? example:  http://www.aircraftspruce.com/catalog/eppages/alt200g.php On a side note, what is the ABSOLUTE MINIMUM required power to keep the engine running using the EC-2, Delco Coils, ONE electric fuel pump (assume some generic power draw here).. No electric water pumps, not worrying about landing lights, avionics (Dynon has a battery backup of its own).. Will the 12 amps generated by the above styled alternator be enough to keep the engine itself running on its own "essential bus"

Any caveats to running a gear driven device with the gear teeth exposed (or.. is there something I'm not seeing here?)

Just fishing for ideas...

Dave