Headspace - No is the short answer regarding the voltage reducer. You would need the optical kill switch as well. It's what is actually allowing you to turn the power to the ignition module on and off with the radio. The diode/reducer would be installed in the line leading from the optical kill switch to the ignition module. This allows the kill switch to run on whatever voltage the receiver is running on and the ignition module the reduced amount, as power to it must pass through the diode.

Radar - I'm not as far into this as you might think I am. Your explanation of your concerns regarding optical isolation brought fresh understanding of what's going on there electronically. It raises the question of why this appears to be working so well without any (enough?) isolation? Not going to pretend I have the answer to that. I can only say I do actually have a lot of stick time run like this. Maybe it's 2.4, maybe the radio, dunno- but Thanks! -Al

I would hope others following would approach the methods discussed here with some caution. Obviously there's some controversy. Suggest somebody considering this might want to educate yourself well enough to make the call on how YOU want to proceed, then do that with lots of testing/range checks. I would not recommend what's going on here for a gas rookie getting ready to test fly his new 50cc plane. Get that down to where you know what you're doing, THEN make the call here.... you already have enough going on!

I think it might also be nice if others running like this would share their single battery experience/setups?