Controllable pitch propellers, their suitability and economy for large seagoing ships propelled by conventional, directly-coupled engines1

Abstract

Models of a tanker of 32,000 t.dw., 16,000 BHP and a freighter of 12,300 t.dw., 7,800 BHP, each propelled alternatively by a fixed blade propeller and a controllable pitch propeller, were extensively tested in the towing tank. In addition to the hydr