1. What is Kayak Hull Speed?

The hull speed is the theoretical maximum speed a displacement hull (like a kayak) can achieve without planing. It's determined by the waterline length of the vessel.

2. How Does the Calculator Work?

The calculator uses the hull speed equation:

Where:

• \( Speed \) — Hull speed in knots
• \( length \) — Waterline length in feet

Explanation: The equation shows that hull speed increases with the square root of the waterline length. The constant 1.55 is derived from wave-making resistance physics.

3. Importance of Hull Speed Calculation

Details: Knowing your kayak's hull speed helps set realistic performance expectations and understand when additional paddling effort won't significantly increase speed.

4. Using the Calculator

Tips: Measure your kayak's waterline length (the length actually in contact with water when loaded) in feet. Enter this value to calculate theoretical hull speed.

5. Frequently Asked Questions (FAQ)

Q1: Can a kayak exceed hull speed?
A: Yes, but it requires significantly more energy as the kayak starts to climb its own bow wave (planing), which is difficult for human-powered craft.

Q2: Does hull speed apply to all kayaks?
A: It applies best to traditional displacement hulls. Some modern designs with flatter hulls can partially plane and exceed this speed more easily.

Q3: How accurate is this calculation?
A: It provides a theoretical maximum. Actual speed depends on paddler strength, water conditions, and kayak design factors beyond just length.

Q4: Why does length affect speed?
A: Longer kayaks create longer waves, and wave speed increases with wavelength. This determines the maximum efficient speed.

Q5: What's the typical hull speed for recreational kayaks?
A: Most recreational kayaks (12-16 feet) have hull speeds between 5-6 knots (5.7-6.9 mph).