13.5m Go Fast Stepped Hull Sport Boat Outboards 3x300hp Architecture&Design Andrei Rochian
Top speed around 60-70 knots with 900 hp.
Sea Behavior
Stability: Stepped hulls are known for their ability to provide a smoother ride by reducing the wetted surface area and improving lift. This results in a stable ride at high speeds and better handling in choppy conditions.

Maneuverability: With three outboard engines, the boat will have excellent maneuverability, especially at lower speeds. At higher speeds, the stepped hull design helps in maintaining stability during sharp turns.

Comfort: The reduction in drag and improved lift typically result in less pounding and a more comfortable ride in moderate sea conditions. However, in very rough seas, the behavior can vary significantly, and the boat may experience more slamming.

Fuel Consumption
Fuel consumption for boats is highly variable and depends on speed, load, and sea conditions. However, we can estimate the fuel consumption using specific fuel consumption (SFC) values for outboard engines.

Specific Fuel Consumption (SFC): Typically, modern outboard engines have an SFC around 0.5 pounds of fuel per horsepower per hour (lb/hp/hr).

Total Consumption:
Fuel Consumption (GPH)=900×0.5÷6.25≈72 GPH
This is an approximation at wide-open throttle (WOT). At cruising speeds (typically around 75% of WOT), fuel consumption will be lower, around 50-60 GPH.


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