46 CFR § 42.25-20 - Computation for freeboard.
(a) The minimum summer freeboards must be computed in accordance with §§ 42.20–5 (a) and (b), 42.20–13, 42.20–15, 42.20–20, 42.20–25, 42.20–30, 42.20–35, 42.20–60, and 42.20–65, except that § 42.20–60 is modified by substituting the percentages in table 42.25–20(a) for those given in § 42.20–60:
Table 42.25–20(a)—Percentage of Deduction for Superstructure
[Total Effective Length of Superstructure]
| 0 | 0.1 |
0.2 |
0.3 |
0.4 |
0.5 |
0.6 |
0.7 |
0.8 |
0.9 |
1.0 |
|
|---|---|---|---|---|---|---|---|---|---|---|---|
| Percentage of deduction for all types of superstructure 1 | 20 | 31 | 42 | 53 | 64 | 70 | 76 | 82 | 88 | 94 | 100 |
1 Percentages at intermediate lengths of superstructures shall be obtained by linear interpolation.
(b) The winter timber freeboard shall be obtained by adding to the summer timber freeboard one thirty-sixth of the molded summer timber draft.
(c) The winter North Atlantic timber freeboard shall be the same as the winter North Atlantic freeboard prescribed in § 42.20–75(d)(1).
(d) The tropical timber freeboard shall be obtained by deducting from the summer timber freeboard one forty-eighth of the molded summer timber draft.
(e) The fresh water timber freeboard shall be computed in accordance with § 42.20–75(e) (1) or (2) based on the summer timber load waterline.