Accession Number:

ADA061565

Title:

Small Waterplane Area Twin Hull (SWATH) Combatant Ship Parametric Study.

Descriptive Note:

Final rept.,

Corporate Author:

NAVAL SHIP ENGINEERING CENTER WASHINGTON DC

Personal Author(s):

Report Date:

1978-09-01

Pagination or Media Count:

35.0

Abstract:

This study defines the anticipated size and speed of SWATH escort ships. The study baseline assumes conventional state-of-the-art materials, subsystems, design philosophy, and operational practices. Double reduction gear and planetary gear transmission systems were included with prime movers in the hulls. Conventional geared electric, right angle drive, and cryogenic systems with turbines in the box or cross-structure were also studied. Installed powers of 45,000 SHP 2 LM 2500s, 70,000 SHP 2 FT9s, 90,000 2 LM 5000s or 4 LM 2500s, 140,000 SHP 4 FT 9s and 180,000 SHP 4 LM 5000s were studied. In addition, the sensitivity of the results to assumptions made in the study was examined. The study results show that current technology SWATH escort ships will displace 5,000 to 8,000 tons. Sustained speeds of these ships will be about 25 knots. Speeds of 30 knots or better are possible by combining a right angle drive or cryogenic transmission system with increased installed horsepower speeds are possible by using all aluminum structure, reducing crew size, or changing mission elements such as range and endurance speed. Such changes will require strong endorsement by the operational community. Author

Subject Categories:

  • Marine Engineering

Distribution Statement:

APPROVED FOR PUBLIC RELEASE