hybrid

Before anyone decides to condemn me to hell for this one, of the several I have read some of the existing threads about potential (and attempted) hybrid builds, although most are quite outdated and didn't seem to finish. So firstly, this is an idea/potential project/question/open discussion so...

First off, I know it can be done, my question is, HAS it been done? I love the raw power and sound of my nitro, but sometime's I'd like to cruise it around my yard with ease and without neighbors complaining (Can't really blame them). I'd like to venture into adding a med-sized motor to my...