This term is usually applied to aerofoil surfaces which dip downwards like the wings of a bird.
The flexing or bending of an aerofoil out of its normal shape.
The stretching of the fabric on the aerofoil framework requires considerable care, especially when using silk.
Gap is the vertical distance between one aerofoil and the one which is immediately above it.
The width of an aerofoil is the distance from the front to the rear edge, allowing for camber.
The motion of the air over the edges of the aerofoil becomes turbulent, and the form of the stream lines suddenly changes.
This term denotes that the aerofoil has such a curved transverse section.
This means its aerofoil (supporting) surfaces must be of polished wood or metal.
When the angle of incidence increases the centre of pressure moves backwards towards the rear of the aerofoil, and vice versa.