INC. ANNOUNCES NAVACAD ver. 3.72
HydroComp Inc., of
Durham, NH USA, is pleased to announce the release of NavCad
to ver. 3.72. NavCad is a software product from HydroComp,
Inc. for the prediction and analysis of speed/power performance.
Widely used by the industry's professional design community, the
development goals for this release were to strengthen its analytical
capabilities for high performance vessels.
A new resistance prediction method for high-speed transom stern
vessels has been added. The HSTS method has proven to be a very
capable method for semi-displacement hull forms in our own in-house
use and testing.
Two important data checking enhancements have been made to NavCad.
First, an additional range check for the NavSea added seas drag
method was developed and implemented. This helps insure against
prediction problems associated with scale effect. Second, an additional
range check parameter was developed and added for the Holtrop method.
Anecdotal experience and testing by HydroComp have identified combinations
of hull parameters that produce significant errors with the Holtrop
method. This parameter has proven to be an indicator of these potential
Minimum Drag Analysis for Planing Hulls
NavCad's parametric Minimum Drag Analysis has been extended to planing
hulls. You can set up a matrix and investigate important planing
hull parameters, such as chine beam, angle of deadrise, LCG, shaft
angle and flap deflection.
Perhaps the most exciting new feature for this build is the analysis
of vessel acceleration. For each entered speed, this new routine
calculates the acceleration (in G's) and the time-to-speed (in seconds).
This is not a simplistic evaluation, but is a first-principles iterative
time-step approach which incorporates vessel added mass and the
engine's torque curve, as well as engine RPM acceleration limits
(i.e., slew rate), to accurately model real engine behavior and
vessel performance. (This feature is available only in the Full
version of NavCad. It is not available for the Small Ship version.)
HydroComp, Inc. provides software products and consultancy services
for the performance analysis and design of marine vehicles to industry,
research and government clients. Currently over 330 marine professionals
in 34 countries worldwide are using HydroComp software.
For more information, please contact:
Tel +33 (0)4 92 91 13 24
Fax +33 (0)4 92 91 13 38