This is something that's just been brought home to me recently. I've been playing with engines for 50 odd years and it's pretty much second nature so sometimes what seems obvious and not worth mentioning gets skipped over. But a while ago I got an electric sailplane and reading in that area I know now I'm a complete newbie, idiot and dunce because I barely understand a word of what they're saying

It would never occur to me to say make sure you use a prop because it seems obvious but imagine my amazement when I read in an electric forum that some guys run in an electric motor. Not only that but they run them in with no load and in a glass of water! No, I'm not suggesting anyone tries that with an engine .