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– Calculate the speed and power for displacement boats by Gerr’s formula. – Calculate power to displacement ratios to the table. – Compare and comment. Kymenlaakso UAS/Terho Halme
Draw the transverse and longitudinal wave patterns when a displacement ship moves through the water. Define Reynolds number with a mathematical formula and explain each parameter in the Reynolds equation with units. Be qualitatively familiar with the following sources of ship resistance:
For a displacement boat, speed is a function of waterline length. The maximum theoretical speed is ordinarily assumed to be 1.34 times the square root of the LWL. Speed to Length Ratio = Velocity in Knots Waterline Length = V LWL
Size determining factors Displacement, deadweight and lightweight When a ship in loaded condition floats at an arbitrary water line, its displace-ment is equal to the relevant mass of water displaced by the ship. Displace-ment is thus equal to the total weight, of the relevant loaded ship, normally in seawater with a mass density of 1.025 t/m3.
Understanding and calculating marine displacement is essential for the design and operation of ships. This tutorial delves into the formulas and calculations associated with marine displacement, focusing on length, breadth, draft, and block coefficient.
According to DNV, Volume 1, Pt. 3, Ch. 1, Sec. 4. Ship design factors given from the ship designers: Surge, sway/yaw and heave accelerations: {B300} Roll motion and acceleration: {B400} Pitch motion and acceleration: {B500} Combined vertical acceleration: {B600} Combined transverse acceleration: {B700} Combined longitudinal acceleration: {B800} ...
prismatic wedge entering incompressible water at a constant vertical velocity: ( ) ⁄ ( )⁄ ( ) (2–7) where: ρ is the water density; V z is the vertical drop velocity, y is a coordinate from the keel across the bottom, c is the wetted half beam, is the deadrise angle and t is the time from the wetting of the keel.
