CPP Pitch • Shaft Power • Torque • Combinator Curve • Hydraulic Pressure • Servo Response • N-1 Pump Flow • Propulsion Control

Marine CPP Pitch, Propeller Load & Hydraulic Control Performance Tool

Screen controllable-pitch propeller operation without inventing a universal hydrodynamic propeller curve. Simple mode checks shaft load, torque, command-to-feedback error and hydraulic pressure. Advanced compares operating points with a user-entered pitch/RPM/load envelope, evaluates hydraulic power-pack redundancy and tests pitch-step response.

Figures represent
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Simple is intentionally compact: 8 inputs. It uses measured shaft power and pitch feedback rather than estimating propeller power from pitch alone. CPP hydrodynamics, combinator curves and overload limits are vessel-specific.
LoadShaft power & torque
PitchCommand vs feedback
HydraulicsPressure margin

CPP Operating Snapshot

kW. Use propulsion-line/OEM basis.
kW.
rpm.
% relative system pitch command.
% feedback. Negative values may represent astern.
bar.
bar. OEM/project criterion.
percentage points. User-entered.

CPP / Propulsion Limits

kW.
kN·m. OEM/shaft-line criterion.
percentage points.
percentage points from entered reference pitch curve.
bar.
°C.
s. User/OEM criterion for the entered test basis.
L one-way effective displacement. User-entered.

Combinator / Load Envelope Reference

Enter vessel/OEM reference points. The tool interpolates between points only; it does not extrapolate outside the entered RPM range.

Use Shaft rpm Reference pitch % Maximum continuous shaft power kW

Operating Point Register

Power and torque are measured/entered values. “P/n³ index” is a trend indicator only and should be compared only at similar pitch and operating conditions.

Use Operating point Direction Shaft rpm Pitch command % Pitch feedback % Shaft power kW Vessel speed kn Hydraulic pressure bar Oil temp °C

Hydraulic Pitch-Control Pump Register

Use Pump Available? Rated flow L/min Derate % Pressure setting bar

Pitch-Step / Servo Response Register

Required average oil flow is estimated from the entered effective servo volume and pitch travel. It is a screening value, not a transient hydraulic simulation.

Use Test / event Start pitch % Target pitch % Achieved pitch % Response time s Minimum pressure bar

Control / Machinery Checks

Engineering boundary: this tool does not calculate actual propeller thrust, cavitation, blade stress or efficiency from pitch percentage alone. Those require the vessel/OEM propeller geometry and hydrodynamic data. The operating envelope, hydraulic pressure, pitch error, torque and response-time limits remain user-entered and vessel specific.
Technical basis: modern CPP installations combine the propeller hub, blades, shafting, hydraulics and propulsion control. Engine makers require CPP combinator/load control to prevent engine overload, with pitch changes coordinated with engine speed and protective pitch reduction when load limits are approached. Because CPP hydrodynamics and hydraulic actuation are customized to the vessel, this tool uses measured shaft power plus user-entered OEM/reference curves and limits rather than a universal pitch-to-power equation.
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