1. What is BHP per Tonne?

BHP (Brake Horsepower) per Tonne is a measure of power-to-weight ratio, commonly used in marine applications to evaluate the power of watercraft relative to their weight.

2. How Does the Calculator Work?

The calculator uses the BHP per Tonne formula:

Where:

• \( BHP \) — Brake horsepower (bhp)
• \( Weight \) — Weight in kilograms (kg)

Explanation: The formula converts weight from kilograms to tonnes (by dividing by 1000) and then divides the BHP by this value to get the power-to-weight ratio.

3. Importance of BHP per Tonne Calculation

Details: This calculation is crucial for assessing a vessel's performance potential, fuel efficiency, and comparing different watercraft designs.

4. Using the Calculator

Tips: Enter BHP in brake horsepower (bhp) and weight in kilograms (kg). All values must be valid (greater than 0).

5. Frequently Asked Questions (FAQ)

Q1: What is a good BHP per Tonne ratio for boats?
A: This varies by boat type, but generally 10-30 bhp/tonne is common for recreational boats, while high-performance vessels may exceed 100 bhp/tonne.

Q2: How does BHP per Tonne affect fuel consumption?
A: Higher ratios typically mean greater fuel consumption, but actual consumption depends on many factors including hull design and operating conditions.

Q3: Should I use metric or imperial units?
A: This calculator uses metric units (bhp and kg). If you have imperial measurements, convert them first (1 hp = 1.01387 bhp, 1 lb = 0.453592 kg).

Q4: Can this be used for ships?
A: Yes, but very large ships typically have much lower BHP/tonne ratios than smaller vessels due to different performance requirements.

Q5: How does this compare to kW per tonne?
A: 1 bhp = 0.7457 kW, so you can convert between them by multiplying or dividing by this factor.