Most propeller aircraft have either a single propeller at the nose or two propellers on the wings. Nose propellers have a big disadvantage as the big fuselage can obstruct the airflow of the propeller and reduce its thrust. Wing-mounted propellers are only obstructed by the engines (which are much smaller) and the wings. Although the airflow over the wings causes some drag, it also increases the lift, while nose propellers don’t have this advantage. Nose-mounted single engine aircraft are still widely used because internal combustion engines are very big, heavy and expensive. When a single engine is sufficient, it will save a lot of cost compared to twin-engine aircraft.
Electric aircraft don’t have this problem. Electric motors are very small, very cheap and need little maintenance. As a result, it doesn’t cost much to increase the numbers of propellers. Because electric motors are very small, the engine pylons can be made much smaller to minimize the interruption of the airflow. As a result, wing-mounted electric motors should better leverage their size advantage and become the standard solution of electric aircraft. However, many experimental electric aircraft (e.g., Pipistrel Velis Electro, eFlyer 2, and eFusion) still have a single nose propeller instead of two wing propellers. So I am wondering if I overestimated the advantage of wing propellers.