It make's a Buzz
The noise level is probably the same with am electric car - Very low, like a screwdriver.
The main difference between the noise of a classic car and a classic plane is that the plane engine has a shorter exhaust making it extremely laud. An electric plane doesn't need an exhaust.
Also a piston engine has a lot of pistons and other things witch, when they move they make the engine vibrate and this is not very god for the plane's integrity and for the comfort of the pilot. An electric engine doesn't have pistons so it has less vibrations.
The only huge factor for the success of an electric plane, car ore any other electric vehicle is the price and range and this one has both.
