Question

Problem 2. (20 points) A hydrofoil 8 ft long and 15 ft wide moves at 14 ft/s in seawater.Approximating the hydrofoil as a (two-sided) flat plate, estimate the drag and

the horsepower required to pull the hydrofoil for Smooth surface [Answer: F=129.7 Ibf] . Rough surface with ɛ=0.01". Use Figure 11-31 on the next page. Note that the ReL scale is logarithmic and the CD scale is linear.

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