ITTC #15
Description
https://ittc.info/media/8372/index.pdf
In the past, shipyards and design offices worldwide assumed different relationships, which sometimes led to inconsistent estimates for the same hull configuration. Eventually, an association called the International Towing Tank Conference (ITTC) was formed to standardise procedure. In 1957 the ITTC adopted the following formula for a smooth hull surface that effectively compensated for the variation in Re [25]: