Bird-Johnson fixed pitch propellers

Transcription

1 Bird-Johnson fixed pitch propellers...leading the field of marine propeller technology for more than forty years Rolls-Royce Naval Marine, Inc Industrial Road Pascagoula, Mississippi USA Telephone: (800) Fax: (228) Rolls-Royce Naval Marine, Inc. 110 Norfolk Street Walpole, Massachusetts USA Telephone: (508) Fax: (508)

2 Rolls-Royce, a leader in the field of marine propeller technology, located in Walpole, Massachusetts and Pascagoula, Mississippi, supplies Bird-Johnson controllable and fixed pitch propeller systems for naval and commercial ships operating around the world. Rolls-Royce Naval Marine Inc. The information contained in this document is the property of Rolls-Royce Naval Marine Inc., its indirect parent company plc, or any other company in the Rolls- Royce group of companies, and may not be copied or communicated to a third party for any purpose other than for which it is supplied without the express written authority of Rolls-Royce Naval Marine, Inc. While this information is given in good faith, based upon the latest information available to Rolls-Royce Naval Marine, Inc., its indirect parent company Rolls-Royce plc, or any other company in the Rolls-Royce group of companies, no warranty or representation is given concerning such information, which must not be taken as establishing any contractual or other commitment binding upon Rolls-Royce Naval Marine Inc., its indirect parent company Rolls-Royce plc, or any other company in the Rolls-Royce group of companies. MP/BJ03/3-01 Printed in USA

3 SAE standard tapers...bird-johnson propellers setting the standard. Propeller hub standard dia. small end(a) hub nominal keyway(d) min. hub* taper min. max. length(b) width (C) depth (D) 3/ /4 3/16 3/32 1-3/8 7/ /8 1/4 1/8 1-9/ /4 1/8 1-13/16 1-1/ /8 1/4 1/ / /4 5/16 5/32 2-1/4 1-3/ /8 5/16 5/32 2-1/2 1-1/ /2 3/8 3/ /16 1-3/ /4 7/16 7/32 3-1/ /2 1/4 3-9/16 2-1/ /4 9/16 9/ / /2 5/8 5/16 4-7/16 2-3/ /4 5/8 5/16 4-7/ /4 5/16 5-5/16 3-1/ /4 3/4 5/16 5-3/4 3-1/ /2 7/8 5/16 6-3/16 3-3/ /4 7/8 5/16 6-5/ /16 7-1/16 4-1/ /4 1-1/8 3/ /2 1-1/4 7/16 8-7/8 5-1/ /4 1-1/4 7/16 9-3/ /8 1/2 10-5/8 6-1/ /4 1-3/8 1/2 11-1/ /2 1-1/2 9/ /8 7-1/ /4 1-1/2 9/ / /4 9/ /4 (A) (E) (D) (C) (B) The combination of experience and expertise gives Rolls-Royce an exclusive technical advantage. In 1986 we acquired an industrial facility in Pascagoula, Mississippi, and turned it into the most fully equipped state of the art ship propeller manufacturing center in the United States. Here, Rolls-Royce produces a broad line of Bird-Johnson fixed pitch propellers in s from 40 to 33 feet. This extensive product offering is backed by the industry s largest inventory of patterns and a captive foundry dedicated solely to the manufacture of marine propellers. Our engineering team includes many well known naval architects and marine engineers as well as world class hydrodynamicists. This combination of experience and expertise gives us an exclusive technical advantage when it comes to evaluating the use of stock or customdesigned propellers for any application. Only then, through the special skills of our foundry men, machinists and propeller technicians, do these engineered solutions evolve into high quality marine propellers worthy to carry the Bird-Johnson product name. Commitment, capability and capacity are the driving forces behind Rolls-Royce. Experience true quality. Experience Rolls-Royce. 12 Tail shaft nominal dia. small end(b) taper nominal keyway(d) thread shaft dia.(a) min. max. length(c) width depth dia. T.P.I. 3/ /16 3/32 1/2 13 7/ /8 1/4 1/8 5/ /4 1/4 1/8 3/ / /8 1/4 1/8 3/ / /2 5/16 5/32 7/ / /8 5/16 5/ / /4 3/8 3/16 1-1/ / /16 7/32 1-1/ /4 1/2 1/4 1-1/ / /2 9/16 9/32 1-3/ / /4 5/8 5/16 1-3/ / /8 5/8 5/ / /8 3/4 5/16 2-1/4 4-1/2 3-1/ /8 3/4 5/16 2-1/ / /8 7/8 5/16 2-1/ / /8 7/8 5/16 2-3/ /8 1 5/ / /4 1-1/8 3/8 3-1/ /4 7/16 3-3/ / /4 1-1/4 7/ /2 1-3/8 1/2 4-1/ / /4 1-3/8 1/2 4-1/ /2 9/ / /4 1-1/2 9/16 5-1/ /2 1-3/4 9/16 5-3/4 4 *Recommended minimum hub for stainless steel propellers. (B) (D) (A) (E) (C) The 62,000 sq. ft. Pascagoula facility is dedicated to the manufacture of marine propellers. AOE 6 Class 23.5, 6-blade, highly skewed, 80,000 pound nickel-aluminum-bronze propeller loaded for over-the-road transport. 1

4 ...quality propellers begin with quality castings. Metal properties Pouring capacity in excess of 195,000 pounds. The success in producing Bird-Johnson fixed pitch propellers results directly from our precise control of the ever-so-critical foundry process. Such is the integrity of casting operations, right here in our own Pascagoula facility, we are able to offer extended service life, ease of repair and a product that lives up to those promises. Manganese bronze Manganese bronze propellers are the most inexpensive to manufacture. Easy to finish, manganese bronze has long been the tradi- manganese bronze nickel-aluminumbronze stainless steel tensile/yield PSI 65,000/25,000 85,000/35,000 70,000/30,000 abrasion resistance fair good excellent corrosion resistance fair good excellent Thanks to the assistance of leading foundry experts, such as Massachusetts Institute of tional bronze propeller alloy. ductility (elongation) 20% 15% 35% Technology (MIT), we have consistently advanced our capability in casting technology to provide the best bronze and stainless steel castings available. Moreover, our stringent foundry process control combined with our comprehensive quality assurance program ensure optimum quality in every casting. Five electric induction and three reverbatory furnaces provide pouring capacity in excess of 195,000 pounds. Bird-Johnson propellers are manufactured in a variety of materials to meet diverse customer needs. Standard alloys include: manganese bronze nickel-aluminum-bronze stainless steel Engineering and development Rolls-Royce has more expertise, more experience and more comprehensive resources than anyone else in the industry. Fixed pitch propeller analysis and sizing is handled by our qualified staff of accomplished marine engineers and naval architects educated in the proper application of both stock and custom-designed propellers. Nickel-aluminum-bronze The high tensile strength of nickel-aluminum-bronze allows the manufacturer to produce propellers with many built-in design features such as thinner blade sections. The advantage of a thinner blade is less hydrodynamic drag which greatly improves a vessel s operating efficiency. Nickel-aluminum-bronze is the metal of choice for US Naval Vessels. Stainless steel Propellers manufactured in our ASTM Grade CF-3 Austenitic Stainless Steel benefit from superior strength and damage resistance inherent in this extra low carbon stainless steel. repairability good good excellent If you want our recommendation on what kind of propeller is best for your kind of work, Rolls-Royce will provide such information as a shared technical resource available at all levels of product application. We are dedicated to exploring new technologies through cooperative programs with naval research and development centers as well as other leading testing facilities throughout the world. We are involved with comprehensive computer-aided engineering (CAE) analysis and utilize these techniques to accurately predict strength and loading. Other recent activities include investigations in: Nonmetallic composite components for improved weight Classification society/standards Bird-Johnson Company manufactures propellers to any required ISO tolerance level, and to the strict requirements of ABS, Lloyds, Veritas and other classification society requirements. Repairs Both the Gulf coast and Seattle operation offer full service repair capabilities. Qualified Service technicians perform straightening, repitching and certified welding. These services are available on a 24-hour emergency basis. Traveling teams are also at the ready to perform in-situ repair. reduction Improved materials for longer life and easier maintainability Improved welding techniques 2 Greater hydrodynamic efficiency At Rolls-Royce your particular application is engineered before the propeller is fitted to the shaft. AOJ 21, five blade, nickel-aluminum-bronze propeller in process; 76,000 pound finished weight. 26, 5 blade, 107,000 pound manganese bronze propeller undergoing tip replacement 11

5 Kaplan type New Generation Workwheels 10 The Kaplan propeller is designed for installation in a nozzle on vessels engaged in trawling or towing operations. A Kaplan nozzle system offers fishing boat and work boat owners maximum economy and efficiency with considerable fuel savings and increased bollard pull of up to 40%. Because of the increased performance characteristics of a Kaplan nozzle system, these propellers must be custom sized in accordance with the vessel s design and power specifications. The Kaplan is available in three, four and five blade configurations Puller holes standard D.A.R D.A.R Reduces vibration levels approximately 50% below traditional workboat designs. New Generation Workwheel features: 0.60 blade area ratio (approx.) Optimized variable pitch distribution Non-linear blade skew of 18 degrees Advanced new technology blade sections In order to optimize the performance of workboat wheels, in both open and ducted versions, Rolls-Royce has developed the New Generation Workwheel series. Designed to outperform conventional 3- and 4-blade standard series propellers, New Generation Workwheels apply state of the art technology routinely used in the design of large, commercial and military propellers. The improved hydrodynamic performance of the New Generation Workwheel results from state of the art hydrodynamic design codes which are applied in both design and off design operating conditions. The use of not only reduces propeller-induced vibration levels, but also increases the thickness/chord ratio of the blade section. This makes the blade sections much less sensitive to cavitation when operating in non-uniform inflow common to workboats. The given nonlinear skew distribution provides the hydrodynamic equivalent of 36 degrees of linear skew while maintaining the structural strength of an unskewed propeller. This feature, combined with the, assures a propeller which reduces vibration levels approximately 50% below traditional workboat designs. The customized new technology blade sections significantly improve cavitation performance and reduce blade area which contributes to improved propeller efficiency. In addition, the new blade sections incorporate a flat pressure face for ease of manufacture and repair. Sophisticated structural finite element analysis and generous blade edge thicknesses insure structural integrity of the new blade design. The end product is a propeller that delivers optimum cavitation and vibration performance while maintaining the structural and maneuvering characteristics of a standard series workwheel. 3

6 New Generation Workwheels Type D New Generation Workwheels provide the following benefits to the workboat operator: Typical Workboat Application The Type D propeller is a work boat propeller supplied where large blade areas Close to 50% reduction in ship hull vibrations due to propeller induced unsteady hull pressures. About 50% reduction in ship machinery vibration levels due to propeller induced unsteady shaft forces. Workwheel Standard series 1,200 1,000 unsteady shaft thrust (Lb.) are required. It is highly effective for river applications and its unique blade tip design allows it to be used in either open or ducted propeller systems unsteady hull pressure (Lb/Ft 2) ,000 23,500 23,000 22,500 22,000 21,500 21,000 20,500 20, bollard thrust (Lb.) propeller efficiency (%) > D.A.R D.A.R

7 Pacific type 8 The Pacific type propeller is usually supplied for freighters and fishing boats where narrow blade area and large propeller s are essential to maintain efficient operational characteristics. The blades of the Pacific type propeller are raked aft in order to gain greater clearance between the blade tips and the hull, thereby minimizing vibration problems. The Pacific type propeller can be furnished in either constant or graduated pitch specifications. Puller holes standard D.A.R D.A.R Cavitation patterns at full power Workwheel Vessels with New Generation Propulsion Landing Craft Towboats Fishing Vessels Offshore Supply Ferries Ocean Tugs ITBs/ATBs Crewboats Yachts/Cruise Swaths Self-propelled Barges Standard series The 5-blade section design is much less sensitive to cavitation when operating in non-uniform inflow common to workboats. This feature assures a propeller which reduces vibration levels approximately 50% below traditional workboat designs. 5

8 Atlantic type Type B 6 The Atlantic type propeller is a conventional constant pitch design. It can be provided in graduated pitch if required. This type propeller is generally supplied for fishing boats, work boats and other commercial applications where maximum propeller is limited and greater blade areas are required. The Atlantic type propeller is typically supplied with aft rake to maximize propeller, but is also available in a no rake design. Puller holes standard 3 blades D.A.R D.A.R D.A.R The Type B propeller is designed to meet the needs of specialized work boat applications. The Type B propeller blade s leading edges, with semi-airfoil section, maintain top vessel operational efficiency while reducing the vibration problems inherent in conventional three and four blade propellers. They can be manufactured in either four or five blade configurations with graduated pitch. Puller holes standard D.A.R. 0.5 D.A.R