PERFORMANCE ESTIMATES OF CAPTURED AIR BUBBLE VEHICLES WITH WATER JET PROPULSION

Abstract

Performance predictions of Captured Air Bubble (CAB) vehicles utilizing water jet propulsion are presented. The analysis was made for various combinations of gross weight, specific loading, length-to-beam ratio, and wave height. In addition, the effect of varying the ducting loss coefficient was also investigated. It was found that the total drag 'hump' of low length-to- beam ratios (l/b) was eliminated at higher l/b values. This effect is due to the complex behavior of the wavemaking drag component. It was further found that for a particular length-to-beam ratio (l/b), a value of specific cushion loading existed which optimized the performance (as measured by the ratio of weight to horsepower required). The lighter specific cushion loadings offered definite performance advantages at the lower length-to-beam ratios.

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Document Details

Document Type
Technical Report
Publication Date
Feb 01, 1967
Accession Number
AD0654564

Entities

People

  • Robert M. Williams

Organizations

  • University of California, Berkeley

Tags

Communities of Interest

  • Ground and Sea Platforms
  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Classification
  • Coefficients
  • Contractors
  • Drag
  • Efficiency
  • Flow Rate
  • Horsepower
  • Jet Propulsion
  • Model Basins
  • Power
  • Pressure Distribution
  • Propulsion Systems
  • Security
  • Ship Model Basins
  • Vehicles
  • Water Jets
  • Waterjet Propulsion

Fields of Study

  • Physics

Readers

  • Marine Hydrodynamics
  • Systems Analysis and Design