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Torque Formula:
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Torque is the rotational force produced by a boat's engine or motor. It determines the engine's ability to do work and is crucial for understanding how quickly a boat can accelerate and how well it can handle heavy loads.
The calculator uses the torque formula:
Where:
Explanation: The formula shows that torque is inversely proportional to RPM at constant power. Higher torque at lower RPM is generally better for boats as it provides better low-speed power.
Details: Torque is critical for boat performance. Higher torque means better acceleration, ability to carry heavier loads, and improved performance when pulling water skiers or wakeboarders.
Tips: Enter the engine power in kW and the engine speed in RPM. Both values must be positive numbers. The calculator will compute the torque in Newton-meters (Nm).
Q1: Why is 9550 used in the formula?
A: 9550 is a constant derived from unit conversions (60,000 divided by 2π) to convert between kW, RPM, and Nm.
Q2: What's a good torque value for a boat motor?
A: This depends on boat size and use. Generally, higher torque is better for heavy boats or watersports, while smaller boats may need less.
Q3: How does torque relate to horsepower?
A: Horsepower is a function of torque and RPM (HP = Torque × RPM / 5252 for imperial units). They're related but measure different aspects of engine performance.
Q4: Should I choose a high-torque or high-RPM motor?
A: For most boats, especially those carrying heavy loads, a motor that produces good torque at lower RPMs is preferable.
Q5: How can I increase my boat's torque?
A: Options include using a lower gear ratio, adding a supercharger/turbocharger, or choosing a motor with different torque characteristics.