Description
Vessel Specification: High-Performance Azimuth Stern Drive (ASD) Tugboat
Class: [To be determined, e.g., Lloyd’s Register, DNV, ABS] | Designer: Robert Allan Ltd.
This specification outlines a powerful and versatile ASD tugboat, designed for demanding harbor towage, ship-handling, and potential offshore support roles. Its design emphasizes high bollard pull, exceptional maneuverability, and significant endurance.
1. Principal Dimensions
| Parameter | Value | Units | Significance |
|---|---|---|---|
| Length Overall (LOA) | 32.00 | m | Ideal size for port operations with significant power. |
| Breadth Moulded | 12.40 | m | Wide beam provides excellent inherent stability. |
| Length-to-Beam Ratio | ~2.58 | – | Indicates a stable, powerful hull form optimized for traction. |
| Design Draft | 5.00 | m | Allows operation in most major ports and approaches. |
2. Propulsion & Performance
| Parameter | Value | Units | Significance |
|---|---|---|---|
| Main Engines | 2 x Caterpillar 3516C or Niigata 6L26HX | – | Twin-engine redundancy with premium power plant options. |
| Propulsion System | 2 x Schottel SRP 460FP | – | 360° steerable rudderpropellers for ultimate maneuverability. |
| Bollard Pull | 65 – 80 | tonnes | Key Performance Metric: Positions this as a high to ultra-high-performance tug, capable of handling Panamax to Capesize vessels. |
| Free-Running Speed | 13.0 | knots | More than adequate for all harbor transit and escort duties. |
- Performance Analysis:
- The bollard pull range reflects different configurations (engine choice, propeller) and operational conditions (draft). An 80t BP is exceptional for a 32m tug.
- Schottel SRP 460FP thrusters are a benchmark for power and reliability, providing exceptional thrust in any direction for precise ship-handling.
3. Tank Capacities & Endurance
| Parameter | Value | Units | Significance |
|---|---|---|---|
| Fuel Oil Capacity | 235,000 | litres | Very large capacity. Enables extended operations without frequent refueling, a major operational advantage. |
| Fresh Water Capacity | 50,000 | litres | Substantial capacity, supporting the crew for long durations. |
4. Design & Operational Capabilities
- Design Philosophy: As a Robert Allan Ltd. design, this tug incorporates proven naval architecture focused on efficiency, seakeeping, and operator safety.
- Primary Roles:
- Ship Handling and Berthing
- Harbor and Coastal Towage
- Escort Towing (if designed for it)
- Offshore Support (Stand-by, Utility)
- Crew Accommodation: Typically configured for 6-8 crew members, with facilities for extended stays.
Summary of Key Characteristics
- Exceptional Power: With a bollard pull of up to 80 tonnes, this tug sits at the top of its class for raw pulling power.
- Superior Maneuverability: The twin Schottel SRP propulsion system allows for pinpoint control, making it highly effective in confined port areas.
- Significant Endurance: The massive 235 m³ fuel capacity is a standout feature, allowing for prolonged operational periods and reducing downtime.
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Proven & Redundant Design: The choice of premium engines and the twin-configuration ensure high reliability and operational uptime.
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