Jim, at the top left corner in the edit menu, you'll see "objects". Click on "engine" or any other objects you want to change. You'll be able to change the engine power, torque, idle rpm, max rpm, weight, right/left thrust. You'll have to find out the suitable parameters for the electric motor and replace them. You can do the same for the prop. After making any changes, you'll need to go to "file" and save. I recommend that you save to a new file name so as not to corrupt the original plane parameters.