Problem 12.29 A 1 in 20 model of a naval ship having a sub-merged surface area of 5m2 and length 8m has a total drag of 20N when towed through water at a velocity of 1.5m/s. Calculate the total drag on the prototype when moving at the corresponding speed. Use the relation Ff=21CfAV2 for calculating the skin (frictional) resistance. The value of Cf is given by Cf=(Re)1.50.0735. Take kinematic viscosity of water (or sea-water) as 0.01 stoke and density of water (or sea-water) as 1000kg/m3