This book is included in the Self Reliance Transportation section.
Preface THIS book gives a reliable and convenient method of designing propellers, based on model experiments, and free from theoretical intricacies and uncertainties. For details of experiments on which the method is based and for theoretical investigations, reference may be had to the author's Naval Architecture. Tables are given for two, three, and four bladed propellers, from which the dimensions of a propeller may readily be determined, without interpolation, when the power, speed and revolutions are assigned, either to give maximum efficiency or to conform to certain restrictions such as limited draught. Drawings and computations for propellers are much simplified by using the projected contour and area of the blades, and tables are given by aid of which exact results may quickly be determined. The designer may, however, use the conventional developed contour of blades, if he prefers; simple methods of drawing such contours are included in the text. A brief treatment is given of methods for determining the power required to propel a ship at a given speed, together with data for various types of ships and boats. It is believed that intelligent use of this material will give satisfactory results under ordinary conditions; the best results, especially under extreme conditions, can be expected only by experienced designers who have specific information. All methods of designing ships and propellers are based, either explicitly or implicitly, on the theory of^ mechanical similitude. The conclusions and methods of this theory may be stated briefly and used easily; a presentation of the theory is given at the end of the book for convenient reference. Contents {Marine} Propellers Methods of Estimating Power. Admiralty Coefficient. Similarity. Mechanical Similitude. Corresponding Speeds. Displacement. Dimensions. Load-water-line. Type Ships. Block-coefficient. Wetted Surface. Law of Comparison. Change of Speed. Change of Displacement. Speed-length-ratio. Model Basins. Resistance. Frictional Resistance. Residual Resistance. Stream-line Resistance. Stream Lines about Ships. Eddy-making Resistance. Wave-making Resistance. Total Resistance. Independent Estimate. Coefficient of Propulsion. Mechanical Efficiency. Efficiency of Propeller. Hull-efficiency. Model Experiments. Comparison of Methods. Methods for Small Boats. Keith's Method. Wave Interference. Power for High Speeds. Screw Propellers. Projections of a Propeller. Proposed Standard Blade. Laying-down Table. Deduction of Properties. Tangent Point. Projected Blade Area. Factor for Blade- angle. Axial Dimension. To Draw Projections. Intersection at Hub. Plane Section. Developed Cylindrical Section. Blades with a Rake. Helicoidal Area. Developed Contour. Standard Developed Contour. Area of the Admiralty Blade. Construction Drawings. Propeller Experiments. Method of Experiments. Virtual Pitch. Variable Pitch. Pitch-ratio. Twisted Blades. Factors for Twisted Blades. Rake of the Blade. Blade Contour. Thickness-ratio. Form of Back. Tests of Similitude. Interaction of Propeller and Ship. The Wake. Real and Apparent Slip. Apparent Slip. Wake Gain. Thrust-deduction. Hull-efficiency. Determination of Wake and Thrust-deduction. Factors for Wake and Thrust-deduction. Mechanical Efficiency. Effective Horse-power. Coefficient of Propulsion. Method of Reporting Experiments. Propeller Tables. Choice of Conditions. Number of Blades. Area-ratio. Best Efficiency. Pitch-ratio and Slip. Efficiency. Small Diameter. Precautions. Degree of Accuracy. Characteristics. Effect of Blade Thickness. Comparison with Tables. Tow-boat Propellers. Small-boat Propellers. Bow-screws. Number of Propellers. Inclination of Shafts. Cavitation. Theory of Mechanical Similitude. Velocity. Acceleration. Force. Table for Mechanical Similitude. Relative Speed. Extended Law of Comparison. Admiralty Coefficient. Independent Estimate. Keith's Method. Revolutions of Propeller. Propeller Equations. Engine Power and Weight. Internal Propulsion. End of Preview.
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