Analyses for both displacement/semi-displacement (Ct-based) and
planing craft are included. The displacement/semi-displacement analysis
is based on the ITTC-78 protocol with 3D form factor, and an equilibrium-trim
analysis incorporating all forces and moments is used for planing
(21) prediction methods for displacement & semi-displacement
hulls include :
displ/semi, UBC trawler, Roach tugboat, Oortmerssen, Delft sailboat
(5 variants), USNA YP, CRTS, Holtrop 1984, HSTS, Jin 1980, Jin 1988,
DeGroot RB, DeGroot HC, Mercier, NPL, VTT RB, VTT HC .
(4) prediction methods for planing hulls include :
Series 62, Series 65B, Savitsky
associated drag reduction analysis can be used to determine how
changes in principal hull parameters affect
A comprehensive appendage drag analysis can be employed, as well
as a wind drag prediction.
(6) prediction methods for appendage drag include :
vessel drag, Blount/Fox (simple), Hoerner (detailed), Sailboat (detailed),
Radojcic (simple), Holtrop (detailed).
(2) prediction methods for wind drag include :
% vessel drag
and Taylor (detailed)
A number of methods are available for the prediction of hull-propulsor
interaction (i.e., propulsive) coefficients.
(7) prediction methods for wake fraction, thrust deduction and relative-rotative
efficiency include :
displ/semi Oortmerssen, Holtrop 1984, Simple sailboat, Simple planing,
Series 62 planing, Blount/Fox planing...
SwiftCraft allows you to size your propulsion system based on a
variety of design objectives to determine diameter, pitch, BAR (blade
area ratio) and/or reduction gear ratio. You can size the system
to match engine power or thrust loading (determined from the total
drag), and include information about parasitic losses (e.g., PTO)
and design points.
The propulsion analysis provides a comprehensive review of the entire
propulsion system for a free-running vessel.
(3) different open-wheel propeller types include:
Gawn AEW, Gawn KCA
propulsion system analysis provides results for :
RPM, Fuel rate, Overall efficiency, Blade pressure, Engine torque,
Propeller thrust, Tip speed, Min Recommended BAR, Engine brake power,
Propeller efficiency, % blade cavitation
associated blade strength analysis can be used to identify a proper