Description
Divide advanceSpeed by positive revolutionsPerSecond times positive diameter for advanceCoefficient.
Marine speed, thrust, and propeller ratios depend on a declared reference frame and coherent units. A scalar term usually describes only one part of vessel performance.
Divide advanceSpeed by positive revolutionsPerSecond times positive diameter for advanceCoefficient.
When to use this tool
Use Propeller Advance Coefficient Reference when you need one explicit marine performance ratio or residual.
How to use the tool and how it works
- Enter advanceSpeed, revolutionsPerSecond, diameter. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read advanceCoefficient. Use the output convention below.
Divide advanceSpeed by positive revolutionsPerSecond times positive diameter for advanceCoefficient.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| advanceSpeed | Advance Speed | Required. Finite number. |
| revolutionsPerSecond | Rotational frequency in revolutions per second, not RPM. | Required. Finite number; strictly above 0. |
| diameter | Diameter | Required. Finite number; strictly above 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| advanceCoefficient | Advance Coefficient | Required. Finite number. |
{
"input": {
"advanceSpeed": 10,
"revolutionsPerSecond": 5,
"diameter": 2
},
"output": {
"advanceCoefficient": 1
}
}Limitations and assumptions
- Use a common length basis and speed per second; the result does not determine thrust, efficiency, or propeller suitability.
- Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Numeric signed-zero results are exported as zero.
Alternative or Complementary methods
Use measured operating data and a vessel-specific propulsion model for performance predictions.
References
Similar or alternative tools
- Propeller Slip Measured Advance Term
Multiply positive pitch by positive revolutionsPerSecond for idealAdvanceSpeed, then return 1 - advanceSpeed / idealAdvanceSpeed as slipFraction.
- Wake Fraction Water Inflow Term
Divide nonnegative inflowSpeed by positive shipSpeed and subtract the quotient from one.