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Small Vessels: Calculation of Reference Values

Author: Toshi2021Executions: 24
TOP/Shared Formulas (Life)/Sports & Outdoors

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Detailed Rules Concerning Safety Regulations for Small Vessels (Amended April 24, R07) (15.1 MB)
Appendix [12] Proper Power Output of Main Engines Installed on Small Vessels
Procedure for Determining the Tests Required When Replacing the Main Engine of an Outboard or Inboard-Outboard Motor
Procedure
1: Calculate the reference value based on the vessel type, etc.
2: Calculate the allowable over-power value based on the reference value
3: Compare the rated output (listed in the vessel inspection logbook) with the result from step 2
　　Rated output > Replaced engine: No issues
　　Rated output + Allowable range ≥ Replaced engine: Requires a warning label
　　Rated output + Allowable range < Replaced engine: Safety verification test required
Captain
m
Width
m
Remote control: 1, No: 0
Transom Height
m
Full Transam: 1, No: 0
Hull draft
°
Outboard motor 1, inboard-outboard motor 2
Replaced Engine
P.S.
Correct Output
P.S.
Fa 
Ship Type 
Reference Value P.S.
Excess P.S. Excess amount compared to the appropriate output
Allowed P.S. The allowable increase in rated output to avoid safety verification testing
Ruling 
Ship types AI, AII, BI, and BII are displayed as 1, 2, 3, and 4
Rating: 1: Sea trials omitted;
　　　2: Sea trials omitted, but a warning label regarding overpowering has been affixed;
　　　3: Safety verification tests (performance tests conducted in the presence of an inspector + 1-hour endurance test by the user following the issuance of a temporary modification certificate)

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