Effect of Low Freeboard on the Behavior of an Amphibious Vehicle in Head Seas.
Abstract
The relatively low freeboard resulting from the low silhouette of the new generation of amphibious craft has raised questions relating to their waterborne performance. Existing configurations having greater freeboard have been speed-limited in smooth water when negative trim has caused bow swamping and loss of visibility. With decreased freeboard the attainable speed of the proposed vehicles may be reduced to an unacceptable level in smooth water and waves. A model test program was initiated to study the behavior of a representative amphibious craft in an operational sea state. The following parameters were systematically varied to evaluate their effect on mean running freeboard, vertical acceleration and mean resistance as a function of vehicle speed in the head sea state 2: vehicle gross weight, vehicle LCG location, height over troop compartment, and deflection angle of water jet propulsor thrust. The general objective was to define the operating boundaries of the vehicle.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1981
- Accession Number
- ADA095065
Entities
People
- E. Numata
- M. J. Chiocco
Organizations
- Stevens Institute of Technology