LONGITUDINAL STABILITY EQUATIONS FOR HYDROFOIL CRAFT WITH CONSTANT LIFT CONTROL SYSTEM

Abstract

Longitudinal equations of motion are developed for a tandem foil hydrofoil craft with a constant lift control on the forward hydrofoil. The roots of the characteristic stability equation are interpreted in terms of the physical motions expected for the craft. Several of the component stability modes involved are independent of one another, thus permitting simplified solutions to the general case of 4 degrees of freedom without loss of accuracy. Control inertia and mass unbalance are shown to have a negligible effect upon the hydrofoil craft motions. The short period craft oscillation can be isolated in study by assuming constant forward velocity of the craft. Numerical correlation was based upon the Lantern configuration developed by the Hydrofoil Corp.

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Document Details

Document Type
Technical Report
Publication Date
Oct 01, 1952
Accession Number
AD0004844

Entities

People

  • C. H. Kahr

Tags

DTIC Thesaurus Topics

  • Accuracy
  • Classification
  • Control Surfaces
  • Control Systems
  • Equations
  • Equations Of Motion
  • Hydrofoil Craft
  • Hydrofoils
  • Military Research
  • Motion
  • Oscillation
  • Shape

Fields of Study

  • Physics

Readers

  • Calculus or Mathematical Analysis
  • Naval Architecture and Marine Engineering.
  • Structural Dynamics.