Small craft; marine propulsion engines and systems; power measurements and declarations

This document establishes a standardized framework for the measurement and presentation of power output in propulsion engines and associated systems installed in small craft and seagoing vessels. It defines specific test procedures and reporting requirements to ensure consistency across the maritime industry. The scope encompasses the methodology for determining net power delivered by marine propulsion units under defined operating conditions, providing a reliable basis for technical comparisons and operational evaluations. Detailed guidelines are provided regarding instrumentation, environmental parameters, and data recording practices to minimize variability during assessment. By adhering to these protocols, manufacturers and operators can achieve uniformity in how engine performance data is documented and communicated. The standards ensure that power measurements are derived through repeatable and verifiable processes, facilitating international trade and technical cooperation. This approach supports safety and efficiency by providing clear specifications for engine rating and validation without introducing subjective interpretation. The guidelines cover the necessary calculations and corrections required to derive accurate power figures from raw test data.