The Naval Architect January 2008

In-depth| TECHNICAL SOFTWARE
‘Quick Check’ could improve design
HSVA has introduced sof_t ware which can identify design aspects requiring work.
M
ost ships built today are part of Uwe Hollenbach, head of HSVA’s resistance The vessel also had a waterplane area co-
a larger series of already proven and propulsion department, said Quick efficient of 0.9239, midship section coefficient
designs, but if an owner is embark- Check had aroused a good deal of interest of 0.9920, longitudinal centre of buoyancy
ing on a project for purpose-designed and built among owners, and that yards – such as of 77.75m, and was a single 5.00m diameter
vessels or a vessel tailored to a specif_i c require- Meyer Werft in Germany – and shipowners propeller vessel. Design speed was 14.50knots,
ment, external appraisal can be invaluable. – such as Maersk – had already made use of estimated power for design speed 5400kW,
However, as Juergen Friesch, managing the service, in addition to Quick Check being and estimated propeller revolution was 136.
director of the HSVA in Germany noted used on a number of large yacht projects, The vessel was to be fitted with a single semi
recently, although numerical predictions and tankers, and multi-purpose vessels. spade-type rudder with a total rudder area
model tests of the type typically carried out HSVA uses the example of a multi- including horn of 22.0m
2
, and rudder aspect
on a proposed design are vastly more efficient purpose/bulk carrier project that was subject ratio of 1.72.
than older, more time consuming and less to a ‘Quick Check’ on behalf of a well-known Comparing this and data on similar vessels
accurate techniques, very often what an owner firm of naval architects and consults. The in HSVA’s database, the main dimensions and
really needs is quick answers on key aspects of Quick Check of the customer vessel’s main main dimension ratios in principle were found
a design, in order that further iterations of a dimensions was based on a comparison of to be within acceptable ranges - compared to
prospective design can be produced and blind main parameters of data for similar vessels tankers and bulk carriers of similar length
alleys identified or problems ironed out. held on the HSVA database, using which its (with a length between perpendiculars of 140m
As he also noted, many owners have long hydrodynamic characteristics were quickly -160m) the block coefficient of CB=0.824 is in
since slimmed down - or closed down - their estimated. the upper range.
own naval architectural departments, and A typical Quick Check of a vessel looks at However, having compared the design with
may have little in-house expertise on which the main dimensions of the hull; propeller tankers and bulk carriers with the same block
to draw, and this being the case, the HSVA dimensions and pressure pulses; speed/power coefficient, and tankers and bulk carriers
recently introduced ‘Quick Check,’ a design characteristics; economical speed; the proposed designed for the same Froude Number, the
assessment service for new designs. sea margin; sea-keeping characteristics; and HSVA found that, as the block coefficient
Based on a comparison of a new design manoeuvring characteristics. was close to the maximum of comparable
with HSVA’s database of design data, HSVA ‘On behalf of the customer, a Quick Check of vessels, an investigation of further variants
believes that Quick Check can rapidly identify the main parameters and the hydrodynamic with reduced block coefficient should be
aspects of a new design that are in need of characteristics of a 149.2m bulk carrier was conducted, and that these variants and their
further work, and quite possibly save an owner performed,’ Mr Hollenbach explained, the building/operating costs be compared using
significant costs that might otherwise be main parameters of the project vessel being cash flow analysis. ‘Having in mind rising fuel
incurred once a vessel enters service because a length overall of 153.00m, length between oil costs, designs with smaller block coefficient
of, for instance, excessive fuel consumption, perpendiculars of 149.20m, breadth of 23.10m, may have a better overall performance and
poor manoeuvrability, or because of the draught of 9.45m, and a block coefficient of thus can earn more money,’ Mr Hollenbach
imposition of operating restrictions. 0.8237. explained. NA
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The Naval Architect January 2008 15
NA Jan - p15.indd 15 07/01/2008 12:50:16
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