So, these vessels are not good for merchant ships. And so in 1950’s and 60’s a series was
generated in the David Taylor model basin of USA called series 60; a number of vessels were
models were manufactured and tested, and you get huge amount of data on series 60 not only
on resistance, these vessels have been tested for sea keeping, for resistance in waves and
maneuvering. So, large tests have been conducted on series 60 vessels and a store house of
data is available in open literature; the resistance data was published by Todd in 1963 in ((
)). Now, series 60’s basic feature is the forward sections are u shaped sections, so they have
reasonably good resistance characteristics and they have good to start a hull form for at the
initial stages of designing a vessel.