1. Ship Length L = X m = ###### ft
Ship Breadth B = X m = ###### ft
Ship Depth D = X m = ###### ft
Ship Draft T = X m = ###### ft
Block Co eff. CB = 0.78
Wake Fraction (twin screw) wf = 0.25
Speed V = 10.00 knots
Speed of Advance Va = 7.48 knots = 12.62 ft/sec
Diameter of the propeller d = 0.99 m = 3.25 ft = 38.98 inch
Density ρ = 1.94 slugs/ft
3
Engine Power P = 350 hp = 261.10 KW
E. Power Transmission loss = 3.00% = 0.03
Engine Delivered Power EDP = 340 hp = 253.27 KW
Engine Shaft Power ESP = 333 hp = 248.05 KW
Engine RPM = 1800
Gear Ratio = 3 : 1
Shaft RPM (Theoretical) = 600
Shaft RPS (Theoretical) = 10
Shaft frictional loss = 5.00% = 0.05
Shaft RPS n = 9.50
J = 0.24
If, Pitch Ratio P/d = 0.80
A. Propeller Series MWR = 0.20 BTF = 0.05 Blade = 4
For this " J " and "P/d" KQ = 0.037
Kt = 0.330
So,
Thrust T = 6425.11 lb For Single Propeller
Torque Q = 2339.97 lb-ft
Total thurst for two propeller TT = 12850.22 lb = 5.83 Tons
B. Propeller Series MWR = 0.25 BTF = 0.05 Blade = 4
For this " J " and "P/d" KQ = 0.039
Kt = 0.345
So,
Thrust T = 6717.16 lb For Single Propeller
Torque Q = 2466.45 lb-ft
Total thurst for two propeller TT = 13434.32 lb = 6.10 Tons
Bollard Pull