Open-Water Curves

A graphically classical way of presenting the propeller solution is the propeller open-water curve set. The open-water (O − W) curves correspond to the design propeller running in open water behind a propeller boat in a towing tank. Of course there are few if any towing tanks of high enough speed to achieve scaled predictions. The alternative is calculated O − W performance with a program, such as VsProp, which is being used for the purpose here.