PROP BLADE RH & LH

REVISION No. - . CHANGE NO. - . MARINE PROPELLER PURCHASE SPECIFICATION 48” x 40” (Inland River Tenders with IRESS upgrades) IBCT-PL P-245-0146 ORGINATED BY J. Happe . DATE 03/15 . ORIGINATOR’S COMMAND Surface Force Logistics Command (SFLC) . DEPARTMENT / DIVISION IBCT-PL . -- 1 of 12 -- USCG – SFLC P-245-146 REVISION - 04/25 Page 1 OF 12 1.0. SCOPE This specification sets forth the requirements for the manufacturing, testing, inspection and packaging of marine propellers for the Inland River Tenders of 48” diameter. The number and type of propellers to be purchased in accordance with this specification will be indicated on the Contract Deliverables List. 2.0. APPLICABLE DOCUMENTS 2.1. DOCUMENT AVAILABILITY - To obtain the referenced documents see section 6.1. 2.2. GOVERNMENT DOCUMENTS - The following specifications and standards form a part of this specification to the extent specified herein. Unless otherwise specified, the documents listed here by number and date shall be those in the current Department of Defense Single Stock Point of Specifications and Standards (DODSSP) and supplements thereto. 2.2.1. SPECIFICATIONS, MILITARY a. MIL-DTL-2845E (SH) Dated 18 August 1999, Preservation, Packaging, Packing and Storage of Propulsion Systems, Boat & Ship; Main Shafting, Propellers, Bearings, Gauges, Special Tools, & Associated Repair Parts. 2.3. OTHER GOVERNMENT DOCUMENTS - The following documents form a part of this specification to the extent specified herein. The documents listed shall be by title and effective date, unless otherwise documented. 2.3.1. DRAWINGS a. USCG Drawing No. 75-WAGL-4400-003, Rev.L, dated 03/2015 2.3.2. SPECIFICATIONS a. COAST GUARD SPECIFICATION, D-000-0100, (latest revision), Bar Coding for USCG Surface Forces Logistics Center Material. 2.4. COMMERCIAL DOCUMENTS - The following documents form a part of this specification to the extent specified herein. The documents shall be the version listed by number and date from the referenced industry organization. Commercial documents may also be listed in the Department of Defense Single Stock Point of Specifications and Standards (DODSSP). 2.4.1. Society of Automotive Engineers (SAE) a. SAE-J-755-80 Dated May 2015, Marine Propeller-Shaft Ends & Hubs. -- 2 of 12 -- USCG – SFLC P-245-146 REVISION - 04/25 Page 2 OF 12 b. SAE-J-448A - Dated February 2023, Surface Texture Standard. 2.4.2. American Bureau of Shipping (ABS) a. ABS Guidance Manual for Bronze & Stainless Steel Propeller Castings Dated 1984. 2.4.3. International Organization for Standardization a. ISO 484/2-1981 (E)- Shipbuilding - Ship screw propellers - Manufacturing tolerances - Part 2: Propellers of diameter between 0.80 m and 2.50 m inclusive. 2.4.4. American National Standards Institute (ANSI)/ National Conference of Standards Laboratories (NCSL). a. ISO/IEC 17025, General Requirements for the competence of testing and calibration laboratories. 2.4.5. American Society For Quality (ASQ). a. ANSI/ASQ Q9003-1994, Dated 199, Model for Quality Assurance Standards in final inspection and test. . 2.5. SPECIFICATION ORDER OF PRECEDENCE - In the event of a conflict between the text of this specification and the references cited herein, the text of this specification takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. 3.0. REQUIREMENTS 3.1. GENERAL - Each propeller shall be classified to the National Stock Number (NSN), and the distinguishing characteristics listed in section 3.2. Manufactured propellers shall meet all requirements of this specification. 3.2. DISTINGUISHING CHARACTERISTICS - Each propeller is distinguished as detailed in Table 1 of this specification by NSN, Blade Orientation, Boat/Cutter Application, Diameter, Pitch, Rake, Skew, Number of Blades, Rated Rotational Speed (RPM), Nominal Hub Bore, Nominal Hub Length, Mean Width Ratio (MWR), and Developed Area Ratio (DAR). All propellers shall have an elliptical contour, vertical genetrix, true helical face, and segmental section. 3.2.1 DIAMETER - Diameter is the distance across a circle generated by the most extreme point of the blades. Propeller diameter shall be as listed in table 1. -- 3 of 12 -- USCG – SFLC P-245-146 REVISION - 04/25 Page 3 OF 12 3.2.2 PITCH - Pitch is the distance the generating helix forming the pressure face of the propeller advances in one rotation. Pitch, determined by measuring the pressure face of the propeller as specified in 3.8 , shall be as listed in table 1. 3.2.3 BLADE ORIENTATION - Blade orientation shall be determined in accordance with the “right hand rule”: Right hand rotation produces thrust directed along the thumb of the right hand when the propeller is rotated in the direction of the fingertip’s, left hand is the opposite. 3.2.4 DEVELOPED AREA RATIO - Developed area ratio (DAR) is the ratio of the developed blade area (the true area of the pressure face surface of all of the blades) divided by the area of a circle with the same diameter as the propeller. The DAR listed in table 1 is the minimum allowed, if specified. 3.2.5 MEAN WIDTH RATIO - Mean width ratio (MWR) is the ratio of the developed area of one blade divided by the length of the blade outside the hub and the diameter. The MWR listed in table 1 is the minimum allowed, if specified. 3.2.6 SKEW – Skew is determined by running a line approximately radially, connecting the line of maximum thickness, (or midline, for segmental propellers) of each section of a blade. The skew angle is the angle subtended along the circumference of the diameter by the midline from hub to blade tip. Propellers shall have either no skew or approximately 15 degrees of blade skew such that the trailing edge of the propeller is essentially straight within the 70% radius from the hub as listed in table 1. 3.2.7 BLADE THICKNESS - Blade thickness is determined by Blade Thickness Fraction, (the ratio between the maximum section blade chor…