RE: How do you choose the prop size?
Unlike Glow and Gas engine planes, the PROP on an electric plane, determines how much power the electrical system will consume.
Put too large of a prop on a glow engine plane, and the engine will bog down, but it is still likely to run.
Do the same with an electric plane, and you are likely to see smoke billowing out of your plane!
The prop size is selected to most effectively match the power capacity you've designed into your electrical system/motor, while giving you the amount of power you are seeking.
Sound a bit nebulous?
Well it is, because selecting the prop on an EP plane is not how you normally start off!
See next message....