GIZMO: Actually, separate ignition and receiver batteries and switches aren't really redundant...one can't work in place of the other.
I'm not saying the dual use (not redundant) system is right for everyone...but is has sure worked for me. The nice thing about this hobby is that one is free to do it this way...or follow the Futaba way...the choice is yours.
Andy: Yes Murphey...as in "Murphey's Law"...look it up in the dictionary...you'll see my picture!
M