Final answer:
To find a leading-edge suction peak in thin airfoil theory, one looks for a sharp drop in pressure at the leading edge on a graph of pressure distribution. The turbulent wake observed behind large flying objects is a result of complex flows, and Bernoulli's principle can provide only a qualitative understanding. Momentum conservation and Newton's third law also play crucial roles in creating lift.
Step-by-step explanation:
To determine if there is a leading-edge suction peak in thin airfoil theory, one typically looks at the pressure distribution around the airfoil in question. Thin airfoil theory makes certain simplifications, such as assuming small angles of attack, and predicts the lift coefficient and pressure distribution around the airfoil. When the pressure distribution is graphically represented, a leading-edge suction peak can be observed as a sharp drop in pressure right at the leading edge of the airfoil. This peak is an indication of very high velocities over the airfoil's surface which, according to Bernoulli's principle, results in a corresponding decrease in pressure.
The presence of a turbulent wake behind large objects like airplanes and sailboats is due to the complex flow patterns and boundary layer separation that occur at higher Reynolds numbers. While Bernoulli's principle can provide a qualitative understanding of the lift force on an airfoil, it fails to accurately predict the complex flows that lead to turbulence. This is why designers also take into account conservation of momentum and Newton's third law in their calculations, acknowledging that lift is not produced by pressure differences alone but also by the deflection of air molecules, which results in turbulent wakes.