The Partnership for America's Cup Technology (PACT) undertook a tank test program in conjunction with the 1992 defense of the America's Cup. The focus of this program was on:
- establishing baseline data, in both calm water and waves, for the American defense syndicates;
- addressing the "tankery" issues of test reliability and accuracy and expansion to full scale;
- developing the test program so that the tank serves as a more capable partner with computational fluid dynamics (CFD);
- improving the techniques of processing test data.
This paper reviews the results of the PACT program that pertain to the methods of calm water testing. Solutions to specific problems of handling tank data are discussed. Traditional methods used to predict viscous drag are compared with those developed by PACT, which include dynamic wetted area and wetted length, refinement of appendage drag estimates and the use of multiple canoe body form factors.
The revised residuary drag that results from these improved methods is directly compared with CFD estimates.
Lastly, a mathematical model, employing least squares regression techniques, is discussed as a method for fairing and representing tank test data.