DieselShip's Online Content Library

Subscription based access to past question papers and solved answers

Sorted topic & Year / Month wise

Buy a Subscription Plan
Academics – Naval Architecture : 2017/OCT/07
Question

Q7. A ship 150 m tong has a load displacement of 27500 tonne in sea water of density 1025 kg/m3. To maintain a speed of 16 knots in the above condition of trials, a shaft power of 7860 kW is required.

SCF for trial condition = 1.08

SCF for service condition = 1.23

Quasi-propulsive coefficient (QPC) = 0.70

Transmission losses = 3%

Wetted surface area (m2) = 2.57 √∆L

Calculate the shaft power required in service for a geometrically similar ship of 22360 tonne load displacement operating at the corresponding speed.  (16)

Note:  The frictional coefficient for the 27500 tonne ship in sea water is 1.413

The frictional coefficient for the 22360 tonne ship in sea water is 1.415

The frictional coefficients are to be used with speed in m/s Speed index (n) is 1.825

Asked in Year/Month/Ques No.
Hello Guest User,
Answers are available via our app only.
Please buy a membership plan and login via our app to view answers.

Download our App

This content is only available to members.