PWS DDG 51.pdf

PERFORMANCE WORK STATEMENT (PWS)

DDG 51 High-Efficiency Propeller 2026

1.0 DESCRIPTION OF SERVICES/INTRODUCTION: The Naval Surface Warfare Center, Carderock Division (NSWC CD) has developed an 18-foot diameter propeller that may provide improved fuel efficiency for the DDG 51 Class of ships. The 18-foot propeller is comprised of multiple blades that are mounted to an existing hub. Implementation of the 18-foot propeller will require validation that the existing DDG propeller hub is compatible with the loads generated by the new propeller.

Additionally, a cost and schedule estimate for the drawing, engineering support and manufacture of a ship-set of blades of this design is being requested.

2.0 BACKGROUND: The DDG 51 class currently uses two 17-foot propeller designs (Flight I and ATD). A larger 18-foot propeller has been developed by NSWC CD to provide more efficient fuel operation of the DDGs. For cost effective implementation, the 18-foot propeller blades need to be mounted to the existing propeller hub, as replacing the existing hub would be cost prohibitive.

Analysis is required to verify the existing propeller hub is compatible with the loading conditions an 18-foot propeller would impose on the hub. The hubs used on the DDG 51 class are a proprietary design of the Bird-Johnson Company, making them the only vendor capable of performing this structural analysis.

3.0 OBJECTIVE:

3.1 The contractor shall provide:

• A structural assessment report containing finite element analyses to evaluate the structural performance of the current 156cm controllable pitch propeller hub with the notional 18-foot diameter DDG 51 propeller blade (Mod A) developed by NSWCCD in accordance to NAVSEA guidance [see 5.1]. Analyses conducted shall include the effect of unsteady forces for the following two conditions: (CDRL A001) o Full power ahead o Full power turn

The report shall include the following:

o Documentation of comparative analytical assessment for the 18-foot Mod A to

2025 results for DDG 51 ATD and the 2024 DDG 51 18-foot design generated by Rolls Royce Naval Marine.

o Evaluation and assessment of potential impacts to the design/ specification of blade bolts, crank pin rings and hub structural components o Recommendation for potential propeller blade design modifications that may reduce stresses in critical areas or improve fatigue life

3.2 The contractor shall provide:

• A cost and schedule estimate for the engineering efforts that would be required to manufacture a ship-set of either the 2024 18-foot design, or the 2026 18-foot Mod A design. The costs and schedule will include elements involved in Modeling, Drawing creation, Pattern procurement, Casting, Machining, Gages, Inspection, Shipping, and Installation support. This plan should assume a 2028 contract award and address how this contract could be integrated into their current production schedule. Risk factors in terms of the cost and schedule should be identified. (CDRL A002)

4.0 SPECIAL QUALIFICATIONS: Not applicable.

5.0 APPLICABLE DOCUMENTS

5.1 [List all documents reference under section 3.0 in chart below]

Document Type

No./Version Title Date

T9070-AY-

DPC-010/245-

0 Design Data Sheet, Department of the Navy, Naval Sea Systems Command, Controllable Pitch Propellers with Bolted on Blades

1 March

6.0 GOVERNMENT FURNISHED EQUIPMENT/PROPERTY/INFORMATION (GFI) (CDRL A003)

6.1 Surface Geometry of the 2026 18-foot Blade Geometry Mod A in IGES or vendor preferred format

6.2 Loads to be applied to the 18-foot Mod A blades for the identified loading cases as tables of point loads and application points

Inputs to the analyses to be furnished by NSWCCD include:

o Hydrodynamic blade surface geometry definition suitable to build 3D finite element model that will adequately represent weight, inertia and center of gravity o Tables of unsteady forces and moments for a single blade for each of the conditions above

7.0 DELIVERABLES: The contractor shall provide deliverables as described in the PWS/SOW and CDRLs.

Format and delivery schedule for deliverables will be outlines in the CDRLs.

CDRL No. NAME TITLE DESCRIPTION DATE DUE

A001 DI-ATTS-81272 Inherent Testability Design & assessment Report

DDG-51 18-Foot Mod A Final Feasibility Technical Report

920612 120 Days after award

A002 DI-FNCL-80448 Life Cycle Cost (LCC) and Independent Schedule

Assessment (ISA) report

Cost and Schedule Manufacturing Estimate

870930 90 Days after award

A003 MGMT-2020-012 Government Property Inventory Government Property (GP) Inventory Report

20200609

8.0 SECURITY REQUIREMENTS:

GFI will be controlled unclassified information, Distribution D, Critical Technology.

9.0 PERIOD OF PERFORMANCE/PLACE OF PERFORMANCE

Day of Award – 120 Days after Award

Government POC: *To be provided upon award.

mailto:scott.d.black4.civ@us.navy.mil mailto:Michael.j.brown15.civ@us.navy.mil