Hey Bruce, would you say that electrics have actually made choosing the appropriate prop less easy? IC engines don't have the "design rpm" thing. So if you've got too little fan area, pitch, blade area, etc the IC engine will show you by turning too high an rpm. The engine screams along and the airplane flies like it's got less power. But with an electric motor, when it's prop hits the design speed, the motor sees no need to turn faster and won't. And the pilot doesn't hear anything that'd tell him he ought to swap on a bigger/pitchier/wider bladed prop?

My short time with electrics has shown me a couple of times that it's less easy to match a prop to the motor/airframe because half the clues don't exist. And more than one of my flying buddies who do mostly electrics use meters to fill in some of the missing clues.

And the motors ability to change their power with more cells (more voltage) messes up the prop choices even more. A buddy just ruined a motor because he saw that motor flying with a much different prop than he was using. The model he saw was bigtime faster and didn't have an anemic climb like his. Well, heck, same motor better performance with appreciably more prop, so his much be hitting that rpm thing. He swapped on the better prop and I don't remember if he burned up the motor or the ESC or both. But the other guy had been using a battery with a higher cell count and electric motors change their "size" when that happens. My buddy went around the rest of that day mumbling something about "our 46 engines don't become 60s when we put in a larger fuel tank"........ or somesuch....... (he used simpler, ruder terms