Model Plane Aerodynamics: Airfoils and Flight Performance

Aerodynamics sits at the heart of model plane performance. The right airfoil can completely change how your plane flies. Let’s look at different airfoils and where they are used.

Cambered airfoils

Cambered airfoils such as the Clark Y produce a lot of lift. They perform well at low speeds, which makes them ideal for trainers. Their downside is increased drag at high speed.

Symmetrical airfoils

Symmetrical airfoils such as the NACA 0012 are essential for aerobatic planes. They behave the same upright and inverted; they produce less lift but are more efficient at high speed.

Semi-symmetrical airfoils

Semi-symmetrical airfoils such as the NACA 2412 strike a good balance between lift and speed. They are a popular choice for sport planes.

Reynolds number and scale

At model scale, Reynolds numbers are low (roughly 50,000–500,000), which leads to different aerodynamic behaviour than full-size aircraft. Thin airfoils and turbulators can improve efficiency at low Reynolds numbers.

A practical tip

Choose a cambered airfoil like the Clark Y for your first model. Move on to semi-symmetrical airfoils as you gain experience, and don’t switch to symmetrical ones before you start aerobatics.