A 1:10 scale model is prepared for an airplane which will fly at 352 ft/s in sta

Question

A 1:10 scale model is prepared for an airplane which will fly at 352 ft/s in standard air. Tests in a pressurized wind tunnel will be used to determine the Drag force on a model. The speed in the wind tunnel will also be 352 ft/s. Find the appropriate air pressure for the model (same air temperature for model and prototype), and the drag on the prototype if a 1 lbf is measured force on the model. A dam spillway is 20 m wide and has a design capacity of 125 m3/s. A 1:15 model is constructed to examine the flow characteristics. What is the required model width and volumetric flow rate? What model operating time relates to a 24-hr period in the prototype? (Ignore any surface tension or viscosity effects). A ship that will be 150m long has a design target velocity of 18knots (1 knot = 1.852 km/h). A 3m model is constructed. What is the appropriate velocity for the model? If the model has a measured wave Drag force of 2.2N, what would the corresponding measurement on the prototype be?

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