Accession Number : ADA602194


Title :   High Speed Trimaran (HST) Seatrain Experiments, Model 5714


Descriptive Note : Rept. for Aug-Oct 2011


Corporate Author : NAVAL SURFACE WARFARE CENTER CARDEROCK DIV BETHESDA MD NAVAL ARCHITECTURE AND ENGINEERING DEPT


Personal Author(s) : Giesberg, Eric ; Metcalf, Bryson


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a602194.pdf


Report Date : Dec 2013


Pagination or Media Count : 161


Abstract : A model of a high speed trimaran seatrain concept was tested for resistance, statics, and controllability. The seatrain, of identical trimaran units developed from the original NSWC Carderock Division connector-less concept, was proposed by CSC as a solution for the America's Marine Highway initiative. Four identical 10 foot long self propelled models were built for the purpose of measuring resistance of incrementally increasing in length seatrains. A series of towed and self-propelled model tests were used for characterizing the effect of the seatrain on propeller inflow velocities. Hull forces and moments developed at varying yaw angles were measured for validating maneuvering simulations produced by CSC. The models were then remotely controlled to demonstrate the operational capabilities of the yaw articulating seatrain. The design showed resistance reductions of up to 30% in comparison to a single unit in resistance while having minimal effect on the inferred propeller inflow velocities. The forces and moments were successfully measured and recorded for simulation verification purposes. A seatrain of two and three units successfully demonstrated that a seatrain can be controlled and maneuvered through a number of typical ship operations. It was found however that simple controllability will require development ot an interdependent autopilot system.


Descriptors :   *BOATS , *MODEL TESTS , DEMONSTRATIONS , HYDRODYNAMICS , MANEUVERABILITY , MARINE TRANSPORTATION , MOMENTS , PROPELLERS , REMOTE CONTROL , RESISTANCE , SELF PROPELLED , SHIP HULLS , STATICS , STEERING , TOWED BODIES , TURNING(MANEUVERING) , YAW


Subject Categories : Marine Engineering


Distribution Statement : APPROVED FOR PUBLIC RELEASE