High speed lighterage assult connector
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HIGH SPEED LIGHTERAGE ASSULT CONNECTOR. JOINT SEABASED THEATRE ACCESS WORKSHOP FEBRUARY 9-10 2005. Dan McCluskey NAVFACHQ. Agenda. Current Lighterage Future Lighterage Requirements Seabasing Requirements R&D Efforts Questions. NL - Legacy

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HIGH SPEED LIGHTERAGE ASSULT CONNECTOR

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High speed lighterage assult connector

HIGH SPEED LIGHTERAGE ASSULT CONNECTOR

JOINT SEABASED THEATRE ACCESS WORKSHOP

FEBRUARY 9-10 2005

Dan McCluskey

NAVFACHQ


Agenda

Agenda

  • Current Lighterage

  • Future Lighterage Requirements

  • Seabasing Requirements

  • R&D Efforts

  • Questions


Current lighterage

NL - Legacy

Speed – 3 Kts

Capacity – 205 LT

<1 ft freeboard

INLS 2005 to 2025

Speed – 10 Kts

Capacity – 300+ LT

4 ft freeboard

Current Lighterage


Future lighterage requirements

Future Lighterage Requirements

N42/N75 tasked Sealift Support Program Office (SSPO) to evaluate next generation lighterage to support MPF(F) and SeaBase


Seabasing requirements

SEABASING REQUIREMENTS

  • Transport 1 Mechanized Battalion Landing Team to the beach in an 8 hr period from a distance of between 25 and 100 nm.

Air

Surface

Future-TBD

Strategic Airlift

Strategic Sealift

APOD

INTRA-THEATER

CONNECTORS

(ADV BASE-SEABASE)

SPOD

CONUS

High Speed Sealift (HSS)

Sea Base

INTER-THEATER

CONNECTORS

(CONUS-SEABASE)

Military/Commercial

Re-supply

Austere

SPODs

Shuttle Ships

High Speed Connectors (HSC)

Intermediate

Log Source

Joint Operations Area

Advanced

Base

Strategic Airlift

Heavy Lift Aircraft

Strategic Sealift

Sea Base leverages forward deployed, pre-positioned, and surge force posture. Arrive ready with scalable air, maritime, and ground forces on accelerated timelines.


Lighterage r d efforts

Lighterage R&D Efforts

  • Need to increase lighterage speed

    • Speed requirements need to be determined based on distance and number of craft to be carried

  • Study conducted by NSWCCD Combatant Craft to increase speed of INLS causeway ferries

    • Study completed Oct 04

    • Approaches

      • Increased main propulsion power

      • Change from 360o waterjet to conventional propellers

      • Reduce wave making resistance - bow shape improvement

      • Reduce frictional resistance - air cushion options


Lighterage r d efforts1

Lighterage R&D Efforts

  • Analysis – Larger Main Engines

    • Increasing the engines from 800 hp to 1200 hp will increase the speed approximately 1 knot


Lighterage r d efforts2

Lighterage R&D Efforts

  • Analysis – Change to Conventional Propellers

    • More efficient than waterjets

    • Will increase speed by about ½ knot


Lighterage r d efforts3

Total Resistance

Frictional Resistance

Lighterage R&D Efforts

  • Analysis – Reduce Resistance Friction

    • Frictional resistance is only a small portion of total resistance

    • Large resistance due to gaps between the modules


Lighterage r d efforts4

Lighterage R&D Efforts

  • Need to reduce total resistance by using air cushion hull form

    • Partial Air Cushion Support Catamaran (PACSCAT) chosen

      • Designed for Moderate Speed and Moderate Payload vice High Speed Low Payload for other concepts (ie surface effect ships)

      • Concept designs used same dimensions as INLS

      • Would require hull shape redesign

      • Analysis then Model Testing of PACSCAT INLS


Lighterage r d efforts5

Lighterage R&D Efforts

  • PACSCAT Model Testing of Modified INLS Hull Shape


Lighterage r d efforts6

Lighterage R&D Efforts

  • Results of Model Testing

    • Speed at full load increased by only 1 knot using PACSCAT technology

      • At full load, the PACSCAT was operating at too high a cushion pressure

      • Large resistance caused by gaps between modules. Future would require methods to cover gaps

    • Larger craft (92’ X 28’) would reduce cushion pressure and increase speed


Future r d efforts

Future R&D Efforts

  • Determine seabasing mission requirements re speed and payload

  • Evaluate single hulled craft vice connected barges

  • Look at various methods to increase speed to meet mission requirements, ie hull form, propulsion

  • Look at various options to launch, ie FLO/FLO, LO/LO, Preposition

  • Evaluate INLS Floating Causeway as a portable/beachable pier to permit offload of intra-theater connectors near the beach without requiring an intermediary platform

  • Continuation of a multiyear SBIR contract

    • Concept Development and Design

    • Prototype Detailed Design

    • Prototype Production and Test


Questions

Questions


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