A smooth flat plate 3 m wide and 30 m long is towed through still water at 20 °C at a speed of 6 m s−1. Determine the total drag on the plate and the drag on the first 3 m of the plate. Estimate the...

A smooth flat plate 3 m wide and 30 m long is towed through still water at 20 °C at a speed of 6 m s−1. Determine the total drag on the plate and the drag on the first 3 m of the plate.

Estimate the skin friction drag on an airship 92 m long, average diameter 18 m, being propelled at 130 km h−1 through air at 90 kN m−2 absolute pressure and 27 °C.