Calculation of Reference Values for Main Engines of Small Vessels
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Calculation of Reference Values for Small Vessels—Detailed Rules for the Safety Regulations for Small Vessels—Related to Article 105
Vessel Type Classification A1 A2 B1 B2
1 Remote Control－－－－－－－－ ○ ○ × ×
2 Transom Height 50 cm or more ○ ○ × ×
3. Drainage function in motor well— ○ ○ × ×
4. Hull deadrise (degrees)——15 or more Less than 15 7 or more Less than 7
5. Full transom—— ○ ○ ○ ×
Fa (Boat Coefficient, Registered Length × Transom Width)
Fa is 40 at most
Unit: PS
1 Remote Control－－－－－－－－ ○ ○ × ×
2 Transom Height 50 cm or more ○ ○ × ×
3. Drainage function in motor well— ○ ○ × ×
4. Hull deadrise (degrees)——15 or more Less than 15 7 or more Less than 7
5. Full transom—— ○ ○ ○ ×
Fa (Boat Coefficient, Registered Length × Transom Width)
Fa is 40 at most
Unit: PS
| A1 | Outdrive |
| A2 | Outdrive |
| B1 Fa15 or higher | B1: Less than Fa15 |
| B1 Distance Learning Fa15 or higher | B1 Distance Learning Fa Less than 15 |
| B₂F₁₅ or higher | Less than B₂Fa₁₅ |
| B2 Distance Learning Fa15 or higher | B2 Distance Learning Fa Less than 15 |
If Fa < 4.5: All grades except B2 → B2
4.1 or higher: 20 → 15
3.8 or higher: 15 → 10
3.5 or higher 10 7.5
3.3 or higher 7.5 5
3.0 or higher 5 4
Less than 3.0 4 4
4.1 or higher: 20 → 15
3.8 or higher: 15 → 10
3.5 or higher 10 7.5
3.3 or higher 7.5 5
3.0 or higher 5 4
Less than 3.0 4 4
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