High Speed Propellers

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.

The early development of the screw propeller. Propeller geometry. The propeller environment. The ship wake field, propeller performance characteristics.

High speed boats necessarily use surface-piercing propellers, but there is very little literature available on surface piercing. My aim is to quantify what I have understood about speed on the water from theory and practice combined. I'm uniquely qualified to write about the combination of fast planing hulls, propellers, and hydrodynamics. I know how a race boat feels under all conditions from 60-85 mph from driving successfully in competition. I have reworked and improved many existing propellers for racing and also for better performance on sport boats. I do my own work on boat bottoms, propellers, and motors. I've set nine outboard speed records, have won four national championships, and I was twice US-1 in my class. On the other side of the coin I'm physics professor with adequate theoretical background in vortex theory and hydrodynamics more generally. The completely new results, not found elsewhere in the literature, are: power-diameter-RPM scaling for propellers and comparison with speed record data, inadequacy of all available measurements of torque coefficients in surface piercing, the difference between efficient surface piercing and supercavitation, complete set of equations (using the mean camber surface to define pitch and camber) for the design of a cleaver from hub to tip, definition of path pitch, use of path pitch to determine the parabolic camber, photos of 3D CAD drawings and 3D printed out models, idealized calculations of torque coefficients and efficiencies, speed-power- weigh scaling law and comparison with existing speed records, clear definition of lift onset, clear definition of planning, lift on monohulls and tunnels, center of pressure and stability of tunnels, estimation of lift coefficient for a v-bottom/tunnel sponson and comparison with data

En lærebog om flypropeller.

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.

Marine Propellers and Propulsion, Fourth Edition, offers comprehensive, cutting edge coverage to equip marine engineers, naval architects or anyone involved in propulsion and hydrodynamics with essential job knowledge. Propulsion technology is a complex, multidisciplinary topic with design, construction, operational and research implications. Drawing on experience from a long and varied career in consulting, research, design and technical investigation, John Carlton examines hydrodynamic theory, materials and mechanical considerations, and design, operation and performance. Connecting essential theory to practical problems in design, analysis and operational efficiency, the book is an invaluable resource, packed with hard-won insights, detailed specifications and data. Features comprehensive coverage of marine propellers, fully updated and revised, with new chapters on propulsion in ice and high speed propellers Includes enhanced content on full-scale trials, propeller materials, propeller blade vibration, operational problems and much more Synthesizes otherwise disparate material on the theory and practice of propulsion technology from the past 40 years’ development, including the latest developments in improving efficiency Written by a leading expert on propeller technology, essential for students, marine engineers and naval architects involved in propulsion and hydrodynamics