18m Passagemaker Trawler Yacht Hybrid Electric Propulsion Architecture& Design Andrei Rochian

Описание: 18 m Passagemaker Trawler Yacht Hybrid Electric Propulsion Architecture& Design Andrei Rochian
Semi displacement hydrodynamically efficient hull
TWO Speed regimes
Preliminary Specifications:
Hull Type: Semi-displacement
Length Overall (LOA): 18 meters
Length Waterline (LWL): 16.6 meters
Beam Overall (BOA): 4.7 meters
Beam Waterline (BWL): 4.1 meters
Hull Height: 3 meters
Overall Height: 5 meters (including flybridge)
Deadrise Angle (Stern): 15 degrees
Chines: Rounded
Propulsion System: Hybrid diesel-electric parallel transmission
Diesel Engines: 2 x 600 hp
Electric Motors: 2 x electric motors
Battery Bank: Sufficient to support electric propulsion
Operation Modes:
Displacement Mode: Electric propulsion
Planing Mode: Diesel propulsion

Performance Prediction Summary
1. Displacement Mode (Electric Propulsion)
Operating Range:
Displacement mode allows for energy-efficient cruising using electric motors, typically operating at speeds that minimize wave resistance.
Predicted Displacement Speed Range: 6-9 knots
Hull Speed (maximum efficient speed): 9.88 knots (theoretical)
Practical Cruising Speed: Between 6-8 knots for optimal efficiency.
Power Usage and Efficiency:
In displacement mode, the yacht's electric propulsion is expected to offer quiet, smooth, and highly efficient operation, consuming minimal energy at lower speeds.
Fuel Efficiency:
In electric-only mode, the fuel consumption is zero, as all power is drawn from the batteries.
2. Planing Mode (Diesel Propulsion)
Power and Speed:
In planing mode, the twin 600 hp diesel engines power the yacht, enabling higher speeds by transitioning to planing.
Estimated Planing Speed:
Moderate Planing Speed: 18-20 knots
Maximum Planing Speed: 22-25 knots (depending on exact weight, sea conditions, and hull efficiency)
4. Acceleration and Transition
Acceleration to Planing:
The 1200 hp available from the diesel engines provides strong acceleration, allowing the yacht to quickly transition from displacement to planing mode. The semi-displacement hull, with its 15-degree deadrise and rounded chines, ensures a smooth lift onto the plane.
Transition Speed:
The yacht is expected to begin planing at around 12-15 knots. This is typical for semi-displacement yachts with moderate deadrise angles
5. Range Estimates
Displacement Mode (Electric):
Range: The range in electric mode is constrained by the size of the battery bank. Assuming electric motors drawing 50-100 kW and a battery bank with 200-400 kWh capacity, the yacht could achieve a range of 30-50 nautical miles at cruising speeds of 6-8 knots before requiring a recharge.
Planing Mode (Diesel):
Range: The range in planing mode is primarily limited by fuel consumption and tank capacity. For a typical fuel tank capacity of 3,000-5,000 liters, cruising at 20 knots with a consumption of 120 liters per hour would yield a range of 400-700 nautical miles. At higher speeds (22-25 knots), the range would decrease due to increased fuel consumption, potentially reducing it to 300-500 nautical miles.
6. Seakeeping and Comfort
Displacement Mode:
The semi-displacement hull design, featuring rounded chines and moderate deadrise, provides a comfortable ride at lower speeds. The yacht should handle moderate waves with minimal slamming, delivering a smooth and stable experience, especially in calm or moderate conditions.
Planing Mode:
At higher speeds, the 15-degree deadrise at the stern strikes a balance between speed and seakeeping. The yacht should perform well in moderate seas, with good wave-handling ability.

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