Accession Number:

AD0626703

Title:

HYDRODYNAMIC RESISTANCE OF SHIPS ON AN AIR CUSHION,

Descriptive Note:

Corporate Author:

DEPARTMENT OF THE NAVY WASHINGTON D C

Personal Author(s):

Report Date:

1965-01-01

Pagination or Media Count:

13.0

Abstract:

The role of the individual components of the hydrodynamic resistance can be determined by the type of surface-effect ship SVP and by the regime under which it is moving the load, initial trim angle, trunk height, and speed of movement. For relative speeds Fr 1, and elongations LB 2.0 to 2.5, and independent of the type of SVP, prevailing are wave resistance and resistance of the interaction which makes its appearance during direct contact of the bow extremity of the hull and the elements of the air cushion enclosure with the water during the transitional phase. When parts of the hull, such as the skegs, for example, are submerged, and for considerable elongations LB 2.5 and low relative speeds Fr 1, the basic component is the friction resistance. Friction resistance and spray resistance predominate at relative speeds Fr 1.5. For the SVP of the nozzle type in which the side and bottom lines are well streamlined the resistance decreases with increase in speed. Unsatisfactory streamlining in the design, ribs in the bottom, and, in many cases, flexible enclosures, increase the resistance. For the chamber type SVP, increase in resistance with increased speed is characteristic in all cases reviewed. Author

Subject Categories:

  • Surface Effect Vehicles and Amphibious Vehicles
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE