1. What is the Boat Speed Formula?

The boat speed formula estimates a boat's speed based on its horsepower, weight, and a hull-specific factor. This simplified formula provides a rough estimate of potential speed for planning purposes.

2. How Does the Calculator Work?

The calculator uses the speed formula:

Where:

• \( horsepower \) — Engine power in horsepower (hp)
• \( weight \) — Total weight in pounds (lb)
• \( factor \) — Hull efficiency factor (typically 150-250 for planing hulls)

Explanation: The formula shows that speed increases with the square root of the power-to-weight ratio, modified by a hull-specific factor.

3. Importance of Speed Calculation

Details: Estimating boat speed helps in selecting appropriate engines, comparing boat designs, and understanding performance potential before purchase or modification.

4. Using the Calculator

Tips: Enter horsepower in hp, weight in pounds, and select an appropriate factor based on hull type. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical factor value?
A: Factors range from 150-250 for planing hulls, lower for displacement hulls. Consult your boat manufacturer for specific values.

Q2: How accurate is this formula?
A: It provides rough estimates. Actual speed depends on many factors including hull design, propeller efficiency, and water conditions.

Q3: Can I use metric units?
A: The formula works with any consistent units, but the calculator currently uses hp and lb for inputs.

Q4: Why square root in the formula?
A: The relationship between power and speed isn't linear - doubling power increases speed by about 41% (√2).

Q5: What affects the factor value?
A: Hull shape, weight distribution, and hydrodynamic efficiency all influence the factor.