Applicability Range of
A HydroComp Technical Report
resistance prediction method is one of the techniques widely used
for predicting resistance of displacement and semi-displacement
vessels. Like all methods, however, this technique is limited
to a suitable range of hull form parameters.
Range of Parameters
ranges of parameters (e.g., Fn, Cp, L/B, B/T) for the method are
described in the literature and in the NavCad User's Guide. However,
anecdotal experience and testing by HydroComp have identified
an additional parameter that should be checked.
New Parameter [Lambda]
Lambda is a parameter used
within the Holtrop method. It is equal to: 1.446 Cp -
Based on the data used
to develop the Holtrop method and testing of vessels from HydroComp
files, we have determined that Lambda should never exceed the
figure shown on the accompanying chart. Lambda below the line
indicates that the hull fits the Holtrop dataset, and above the
line it does not.
Users of the Holtrop-1984
method should refer to this chart to determine if Holtrop-1984
is a suitable method for the vessel under consideration.