Series 60

Series 60 is the systematic merchant-ship resistance series run by F.H. Todd at the David Taylor Model Basin in the 1950s, covering single-screw cargo-ship forms. The parents span block coefficient from 0.60 to 0.80, with further variation in length-beam ratio, beam-draft ratio, and longitudinal center of buoyancy, and the results are presented as residuary-resistance charts against Froude number for early powering estimates. Published in the SNAME Transactions (Todd, 1957), it became a reference data set for decades and one of the standard hull forms later used to validate resistance prediction methods and CFD. Modern regression methods such as Holtrop-Mennen draw on this lineage of systematic series.