The parameter that affects most the resistance of the ship is the fullness of the ship. How full the ship is, is represented by the form coefficients; mainly, CB and CP and Cmidship- we will see all of these. CB, of course, the block coefficient, tells us how full the ship is and gives us some idea about how the ends are shaped so that, generally we can say that if the ends are shaped more smoothly or more narrowly, then I can get a higher speed- that means, speed, higher speed will lead to lower CB or fine form. That is the reason you will find bulk carriers and tankers are full form ships with high CB, and passenger ships, container ships etcetera, are finer form.