In the case of the controllable pitch unit the blades are designed as constant pitch angle blades to enable a nominal equality of thrust to be achieved in either direction for a given pitch angle. The fundamental decision at this stage is to determine whether the unit will be a controllable pitch, constant speed machine or a fixed pitch, variable speed unit the former units being perhaps the most common amongst larger vessels. Having determined the required size of the unit it is necessary to configure the geometry of the unit to provide the maximum possible thrust. JS Carlton, in Marine Propellers and Propulsion (Second Edition), 2007 14.1.2 Unit design Hence, by including spindle torque data, this series is one of the more complete for controllable pitch propeller hydrodynamic study purposes and to aid studies polynomial regression coefficients have also been given by the authors. The range of conditions tested extends to both positive and negative advance coefficients. Results are presented for thrust, torque, and hydrodynamic spindle torque coefficient for the series under noncavitating conditions. (1979), was tested at Shanghai Jiao Tong University and measurements were made over a range of 50 degrees of pitch change distributed about the design pitch setting. The propeller series, presented by Chu et al. The blade design pitch distribution is constant from the tip to 0.6 R but is reduced in the inner region of the blade near the root. As in the case of the Gutsche and Schroeder propeller series, the blade thickness fraction is 0.05. The propellers all have a boss diameter of 0.28 D and each of the members of the expanded area groups have design pitch ratios of 0.4, 0.5, 0.8, 1.0, and 1.2, respectively. ![]() The propellers are split into three groups of five having expanded area ratios of 0.35, 0.50, and 0.65. The JD-CPP series is also a three-bladed controllable pitch series comprising 15 model propellers each having a diameter of 267.9 mm. ![]() Carlton FREng, in Marine Propellers and Propulsion (Fourth Edition), 2019 6.5.13 The JD-CPP Series
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