1. What is the Maximum Speed Formula?

The maximum speed formula estimates a boat's theoretical hull speed based on its waterline length and hull design factor. This calculation is particularly relevant for displacement hulls.

2. How Does the Calculator Work?

The calculator uses the maximum speed formula:

Where:

• \( LWL \) — Waterline length in feet
• \( hull\_factor \) — Dimensionless factor accounting for hull design (typically 1.0-1.5)
• 1.34 — Empirical coefficient for displacement hulls

Explanation: The formula shows that maximum speed increases with the square root of waterline length and is modified by hull design characteristics.

3. Importance of Maximum Speed Calculation

Details: Knowing a boat's theoretical maximum speed helps in design evaluation, performance prediction, and engine selection.

4. Using the Calculator

Tips: Enter waterline length in feet and appropriate hull factor (1.0 for standard displacement hulls, higher for performance designs). All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is waterline length (LWL)?
A: The length of the boat at the waterline from bow to stern when normally loaded.

Q2: How do I determine hull factor?
A: Standard displacement hulls use 1.0. Performance hulls may use 1.1-1.3. Ultra-performance designs may approach 1.5.

Q3: Does this apply to all boat types?
A: Primarily for displacement hulls. Planing hulls can exceed this speed with sufficient power.

Q4: Why 1.34 coefficient?
A: This empirical value accounts for the relationship between wave-making resistance and hull speed in displacement vessels.

Q5: How accurate is this calculation?
A: It provides a theoretical maximum. Actual speed depends on many factors including power, weight, and sea conditions.