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Helicopter Operations Support Ship

LCDR Matt HawksLT Marianne Holt-Phoenix

LT Duncan McKay

Conversion Design

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SBSE of 2015 MEBAircraft QuantityMV-22 48AH-1Z 18UH-1Y 9CH-53 20

VT UAV 6Total 101

Purpose of Conversion

• HOSS fills the capability gap to transport and support the rotary and tilt-wing portion (Sea Based Support Echelon -SBSE) of the 2015 Marine Expeditionary Brigade (MEB) Air Combat Element (ACE)

• Convert with minimal impact to base design, thus minimizing cost

HOSS DesignAircraft QuantityMV-22 24AH-1Z 9UH-1Y 5CH-53 10

VT UAV 3Total 51

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Design Philosophy

Design goals:• Maximize ability to

transport aircraft• Minimize changes to

existing design– propulsion– flight deck– other stowage

(vehicle,well deck)

The design must be:• based on an existing

design• able to transit the

Suez and Panama Canals

• not steam-propelled• capable of 20 knots

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Design Goals & Thresholds

500,000 gallons

200,000 gallons

JP-5 Capacity

2000500Supported Troops

11,000nm7,000nmRange

10070Aircraft Capacity (CH-46 eq. units)

GoalThresholdParameter

5

Modification Factor WeightFactor

Propulsion Plant Changeout 0.4Add Flight Deck 0.4

Miscellaneous Space Conversion 0.2

0.1JP-5 Capacity0.1Supported Troops0.2Range0.6Aircraft Capacity

Weight FactorMOE

MOE/MF Model

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OMOE vs. Modification Factor

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.0

0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0

Total Modification Factor Estimate 0 = most difficult1 = least difficult

OMOE0 = least capable1 = most capable

Optimum Point(most capable, least difficult)

LSD

CV

LHD

LPD-17

LHA

LMSR

Selection of Base Platform

WINNERLHD-8

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Modifying LHD-8

• Two significant changes:– The former vehicle stowage deck was lowered by 2 ft– An elevator was added to reach the former well deck

• Strength and stability analyses showed all criteria met per DDS 079-1 and SDS 100-1

• Analyzed both Min Op and Fully Loaded conditions (both with and without embarked A/C)

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Enlarging Upper Vehicle Stowage Deck

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Internal Aircraft Arrangements

AFT

HANGAR DECK

LOWERAIRCRAFTSTOWAGE DECK

FWD

UPPER AIRCRAFTSTOWAGEDECK

10

Lower Aircraft Stowage Deck

FWD

ELEVATOR

AFT

AH-1

MV-22

11

Upper Aircraft Stowage Deck

AH-1

MV-22

CH-53

AFT

FWD

CARGOELEVATORS

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Hangar Deck

FWD

MV-22

AH-1

AVIONICSSHOP

AFT

EXTERNALELEVATORS

INTERNALELEVATOR

CARGOELEVATORS

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Performance Summary

Parameter Threshold Goal HOSS Design

Aircraft Capacity in

CH-46 equivalent

units

70 units 100 units 93 units

Range 7000 nm 11000 nm 9500 nm

Supported Troops 500

personnel

2000

personnel

1900

personnel

JP-5 Capacity 200,000

gallons

500,000

gallons

484,000

gallons

Notes: • HOSS has significant surge berthing– half of the 2015 MEB SBSE ACE is only 950 troops

• HOSS also maintains medical capability of LHD-8

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Future Work

• Real cost estimates need to be performed

• Aircraft stowage layout needs to be assessed by the Carrier Analysis Group at NAVAIR Lakehurst, New Jersey

• Some excess ballast tank capacity revealed by POSSE analysis could be utilized as increased JP-5 capacity

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Questions?

2 HOSS bring the2 HOSS bring the2015 MEB SBSE ACE2015 MEB SBSE ACE

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