A model tow-tank test is conducted on a bare hull model at the model design speed in calm water. Determine the effective horsepower (hp) for the ship, including appendage and air resistances. The following parameters apply to the ship and model: Ship 1,100 Model Length (ft) 30 Hull Wetted Surface Area (ft2) Speed (knots) 250,000 15 Freshwater Water Seawater 50°F 70°F Projected Transverse Area (ft2) Cair 7,500 0.875 Appendage Resistance (% of bare hull) Hull Resistance (Ibf) 10% 20

Elements Of Electromagnetics
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ISBN:9780190698614
Author:Sadiku, Matthew N. O.
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QUESTION 7
A model tow-tank test is conducted on a bare hull model at the model design
speed in calm water. Determine the effective horsepower (hp) for the ship,
including appendage and air resistances. The following parameters apply to the
ship and model:
Ship
1,100
Model
Length (ft)
Hull Wetted Surface Area (ft2)
Speed (knots)
30
250,000
15
Freshwater
Water
Seawater 50°F
70°F
Projected Transverse Area (ft²)
Cair
7,500
0.875
Appendage Resistance (% of bare hull)
10%
Hull Resistance (Ibf)
20
Transcribed Image Text:QUESTION 7 A model tow-tank test is conducted on a bare hull model at the model design speed in calm water. Determine the effective horsepower (hp) for the ship, including appendage and air resistances. The following parameters apply to the ship and model: Ship 1,100 Model Length (ft) Hull Wetted Surface Area (ft2) Speed (knots) 30 250,000 15 Freshwater Water Seawater 50°F 70°F Projected Transverse Area (ft²) Cair 7,500 0.875 Appendage Resistance (% of bare hull) 10% Hull Resistance (Ibf) 20
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