Radio-controlled airplanes come in all shapes and sizes:from the Mini Flyer-plane with a wingspan of a inches (23centimeters),to the huge passenger jet models with a 29 1/2 foot (a-meter)wingspan. The price of the aiplanes varies from 30 to sevend dollars. There are different methods of propulsion, or ways to power the planes. These range From electric motors to expensixe jet turbines.