Download or read book The Theory of Propellers written by Theodore Theodorsen and published by . This book was released on 1944 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt: Summary: A technical method is given for calculating the axial interference velocity of a propeller. The method involves the use of certain weight functions P, Q, and F. Numerical values for the weight functions are given for two-blade, three-blade, and six-blade propellers.
Download or read book Tests of Two blade Propellers in the Langley 8 foot High speed Tunnel to Determine the Effect on Propeller Performance of a Modification of Inboard Pitch Distribution written by James Benjamin Delano and published by . This book was released on 1951 with total page 724 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper presents propeller characteristics for two propellers that differ only in inboard pitch distribution. The forward Mach number range extended to 0.062 and the blade-angle range was from 20 to 55 degrees. Section thrust-coefficient data are also presented to afford a more detailed analysis of the effects of modifying the pitch distribution of the inboard sections of a propeller.
Download or read book Twenty First Symposium on Naval Hydrodynamics written by National Research Council and published by National Academies Press. This book was released on 1997-09-11 with total page 1100 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Summary of Advanced Methods for Predicting High Speed Propeller Performance written by Lawrence J. Bober and published by . This book was released on 1980 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Marine Propellers and Propulsion written by John Carlton and published by Butterworth-Heinemann. This book was released on 2012-10-30 with total page 539 pages. Available in PDF, EPUB and Kindle. Book excerpt: The early development of the screw propeller. Propeller geometry. The propeller environment. The ship wake field, propeller performance characteristics.
Download or read book Propeller Handbook Second Edition The Complete Reference for Choosing Installing and Understanding Boat Propellers written by Dave Gerr and published by International Marine/Ragged Mountain Press. This book was released on 2017-03-10 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Complete Reference for Choosing, Installing, and Understanding Boat Propellers—a first of its kind reference—fully revised and updated Propeller Handbook, Second Edition demystifies the operation, behavior and selection of propellers and provides practical and detailed advice in readable, easy-to-understand language. The book will enable readers to size and select the correct propeller for their boat or for boats they may be working on. Solutions to propeller problems, installation considerations, propeller shafting, number of blades and blade area, boat speed and powering calculations and considerations, and much more are discussed in detail. In the twenty-seven years since the publication of the first edition, Propeller Handbook, has become a cornerstone resource that marine-industry professionals rely on. All material from the previous edition is completely rewritten to reflect the author’s additional 27-years of experience in boat design and propeller selection since the first edition was introduced. Significant changes in the emphasis placed on factors such as blade area and propeller and engine matching, underlie the revised propeller-selection approach. Plus, the entire book has been updated to fully include metric and English units.
Download or read book An Analysis for High Speed Propeller nacelle Aerodynamic Performance Prediction written by and published by . This book was released on 1988 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book High Speed Propeller Performance written by Olle Rutgersson and published by . This book was released on 1982 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effect of Simulated Icing on Propeller Performance written by Blake W. Corson and published by . This book was released on 1946 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt: Tests of a 10-foot-diameter three-blade Curtiss 89301-15 propeller with Clark Y blade sections have been conducted in the Langley 16-foot high-speed tunnel in order to determine the effect of simulated iceon the aerodynamic characteristics of the propeller. The irregular coat of cement and fabric was used on the blades to simulate in outline and thickness a formation of glaze ice that might be formed in flight. The propellers were tested on a new 2000-horsepower dynamometer, a brief description of which is included. All tests were made at a rotational speed of 1800 rpm for blade angles of 20, 25, 35, and 40 degrees at the 42-inch radius and at airspeeds varying from 120 to 420 miles per hour. The results are representative of full-scale constant-speed propeller operation.
Download or read book Summary and Recent Results from the NASA Advanced High Speed Propeller Research Program written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-08-20 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advanced high-speed propellers offer large performance improvements for aircraft that cruise in the Mach 0.7 to 0.8 speed regime. The current status of the NASA research program on high-speed propeller aerodynamics, acoustics, and aeroelastics is described. Recent wind tunnel results for five 8- to 10-blade advanced models are compared with analytical predictions. Test results show that blade sweep was important in achieving net efficiencies near 80 percent at Mach 0.8 and reducing near-field cruise noise by dB. Lifting line and lifting surface aerodynamic analysis codes are under development and some initial lifting line results are compared with propeller force and probe data. Some initial laser velocimeter measurements of the flow field velocities of an 8-bladed 45 deg swept propeller are shown. Experimental aeroelastic results indicate that cascade effects and blade sweep strongly affect propeller aeroelastic characteristics. Comparisons of propeller near-field noise data with linear acoustic theory indicate that the theory adequate predicts near-field noise for subsonic tip speeds but overpredicts the noise for supersonic tip speeds. Potential large gains in propeller efficiency of 7 to 11 percent at Mach 0.8 may be possible with advanced counter-rotation propellers. Mitchell, G. A. and Mikkelson, D. C. Glenn Research Center NASA-TM-82891, E-1269, NAS 1.15:82891 RTOP 535-03-12...
Download or read book Aircraft Propeller Design written by Fred Ernest Weick and published by . This book was released on 1930 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: En lærebog om flypropeller.
Download or read book Aerodynamics for Naval Aviators written by H. H. Hurt Jr. and published by www.bnpublishing.com. This book was released on 2012 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aerodynamics for Naval Aviators is the traditional text for Navy pilots. Also used by the U.S. Air Force, it remains the definitive work on applied aerodynamics for pilots. It effectively communicates the intricacies of aerodynamics in an accessible manner, and includes charts, illustrations, and diagrams to aid in understanding. This text is reader-friendly and great for any serious beginner as well as any experienced pilot, and is the definitive source on aerodynamic and engineering theory as they apply to flight operations.
Download or read book Investigation of the NACA 4 4 06 04 Two blade Propeller at Forward Mach Numbers to 0 925 written by James B. Delano and published by . This book was released on 1949 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: Investigations of the NACA-4-(4)(06)-04 two-blade propeller (design thickness, 0.06 at 0.7-radius station) have been made in the Langley 8-foot high-speed wind tunnel for blade angles from 20 to 70 degrees for forward Mach number up to 0.925.
Download or read book Power Prediction Modeling of Conventional High Speed Craft written by Dejan Radojčić and published by Springer Nature. This book was released on 2019-10-29 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt: The proposed book addresses various power prediction methods, a principal design objective for high-speed craft of displacement, semi-displacement, and planing type. At the core of the power prediction methods are mathematical models based on experimental data derived from various high-speed hull and propeller series. Regression analysis and Artificial Neural Network (ANN) methods are used as extraction tools for this kind of models.The most significant factors for in-service power prediction are bare hull resistance, dynamic trim, and the propeller’s open-water efficiency. Therefore, mathematical modeling of these factors is a specific focus of the book. Furthermore, the book includes a summary of most of the power-prediction-relevant literature published in the last 50 years, and as such is intended as a reference overview of the best high-speed craft modeling practices.Once these mathematical models have been developed and validated, they can be readily programmed into software tools, thereby enabling the parametric analyses required for the optimization of a high-speed craft design. The proposed book is intended primarily for naval architects who design and develop various types of high-speed vessels (yachts, boats etc.), as well as for students who are interested in the design of fast vessels. The book includes useful Excel Macro Codes for the outlined mathematical models. Moreover, software for all considered models is provided.
Download or read book An Analysis for High Speed Propeller Nacelle Aerodynamic Performance Prediction Volume 1 written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-23 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt: A computer program, the Propeller Nacelle Aerodynamic Performance Prediction Analysis (PANPER), was developed for the prediction and analysis of the performance and airflow of propeller-nacelle configurations operating over a forward speed range inclusive of high speed flight typical of recent propfan designs. A propeller lifting line, wake program was combined with a compressible, viscous center body interaction program, originally developed for diffusers, to compute the propeller-nacelle flow field, blade loading distribution, propeller performance, and the nacelle forebody pressure and viscous drag distributions. The computer analysis is applicable to single and coaxial counterrotating propellers. The blade geometries can include spanwise variations in sweep, droop, taper, thickness, and airfoil section type. In the coaxial mode of operation the analysis can treat both equal and unequal blade number and rotational speeds on the propeller disks. The nacelle portion of the analysis can treat both free air and tunnel wall configurations including wall bleed. The analysis was applied to many different sets of flight conditions using selected aerodynamic modeling options. The influence of different propeller nacelle-tunnel wall configurations was studied. Comparisons with available test data for both single and coaxial propeller configurations are presented along with a discussion of the results. Egolf, T. Alan and Anderson, Olof L. and Edwards, David E. and Landgrebe, Anton J. Unspecified Center NASA-CR-4199-VOL-1, E-4382, NAS 1.26:4199-VOL-1 NAS3-20961; NAS3-22142; NAS3-22257; RTOP 535-03-01...
Download or read book Ship Resistance and Propulsion written by Anthony F. Molland and published by Cambridge University Press. This book was released on 2011-08-08 with total page 569 pages. Available in PDF, EPUB and Kindle. Book excerpt: Written by experts in the ship design field, this book provides a comprehensive approach to evaluating ship resistance and propulsion.
Download or read book High Speed Turboprops for Executive Aircraft Potential and Recent Test Results written by and published by . This book was released on 1980 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
