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By reducing the dimensions of a
full-sized aircraft proportionally, a scaled model will be obtained, however, it seldom becomes an easy flying one.The main aerodynamic differences between a model and a full-sized aircraft are originated from the boundary layer, the thin layer of air close to the wing
surface that is slowed down by skin friction.
According to Osborne Reynolds, there are two main types of flow: The laminar and the turbulent.
Which flow type occurs within the boundary layer at a given point of the wing's surface depends on the wing's form, the surface's roughness, the chord length, the airspeed and the ratio of density to viscosity of the air.Reynolds combined all those factors (except the surface condition) into a non-
dimensional number known as Reynolds Number Re.
Re = (air density/air viscosity) x air speed x wing chord
surface that is slowed down by skin friction.
According to Osborne Reynolds, there are two main types of flow: The laminar and the turbulent.
Which flow type occurs within the boundary layer at a given point of the wing's surface depends on the wing's form, the surface's roughness, the chord length, the airspeed and the ratio of density to viscosity of the air.Reynolds combined all those factors (except the surface condition) into a non-
dimensional number known as Reynolds Number Re.
Re = (air density/air viscosity) x air speed x wing chord
