A 20kg hybrid drone that can fly at 50kmh for 4 hours
I don't understand anything in aerodynamics, so pardon my stupid question: planes are the most wide-spread flying machines because they are vastly more efficient than a rotary-wing aircraft due to the lift generated by wings. Why then a quadcopter is the default shape for smaller drones? Is it because small wings don't generate enough lift for the drone to make a difference? But they surely provide additional stability and won't hurt at a glance.