Description
Divide aftDraft minus forwardDraft by positive length for a signed slope.
Vessel draft, loading moments, and free-surface terms describe different parts of hydrostatic behavior. Their signs, reference positions, and dimensional bases must be stated before comparison.
Divide aftDraft minus forwardDraft by positive length for a signed slope.
When to use this tool
Use Vessel Trim Longitudinal Slope Factor when you need a supplied trim, loading, or hydrostatic component.
How to use the tool and how it works
- Enter forwardDraft, aftDraft, length. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read slope. Use the output convention below.
Divide aftDraft minus forwardDraft by positive length for a signed slope.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| forwardDraft | Forward Draft | Required. Finite number. |
| aftDraft | Aft Draft | Required. Finite number. |
| length | Length | Required. Finite number; strictly above 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| slope | Slope | Required. Finite number. |
{
"input": {
"forwardDraft": 6,
"aftDraft": 8,
"length": 100
},
"output": {
"slope": 0.02
}
}Limitations and assumptions
- Draft and length must share a length unit; the result is a small-slope ratio, not a complete stability or trim assessment.
- 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
Consult vessel-specific hydrostatic and stability information under the relevant loading condition for a complete assessment.
References
Similar or alternative tools
- Vessel Trim Reference Midpoint
Use the slope (aftDraft - forwardDraft) / (aftPosition - forwardPosition) to evaluate draft at referencePosition.
- Trim Moment Per Centimeter Factor
Divide trimMoment by positive momentPerCentimeter to obtain centimeters.