How to improve a wing's lift to drag ratio?

Preferably by changing either the :



a: Aerofoil cross section

b: Aspect ratio

c: Planform shapeHow to improve a wing's lift to drag ratio?Increasing the aspect ratio will help with L/D, mostly by reducing the tip losses from the spanwise flow of air. A really good modern airfoil (cross section) will out perform an older poor performing one at any aspect ratio. If you carry high aspect ratios to extremes, you will start to lose L/D do to declining Reynolds numbers.How to improve a wing's lift to drag ratio?The aspect ratio is usually the main driving force into the lift to drag ratio, at the possible expense of overall weight, however, as long slender wings are harder to make rigid and light than short stubby ones. That said, a bad airfoil can really ruin your day.How to improve a wing's lift to drag ratio?B aspect rationHow to improve a wing's lift to drag ratio?improving the aspect ratio would be the best way