1. What is RC Boat Hull Speed?

Definition: Hull speed is the theoretical maximum speed a displacement hull can achieve without planing.

Purpose: This calculator helps RC boat enthusiasts determine the optimal speed for their scale models based on waterline length.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( HS \) — Hull speed (knots)
• \( LWL \) — Waterline length (feet)

Explanation: The 1.34 factor is derived from wave-making resistance physics, and the square root relationship shows how speed increases with length.

3. Importance of Hull Speed Calculation

Details: Knowing hull speed helps in selecting appropriate motors and propellers, and achieving realistic scale performance.

4. Using the Calculator

Tips: Measure your RC boat's waterline length (LWL) in feet and enter it above. The value must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: Does this apply to all RC boats?
A: Only displacement hulls. Planing hulls can exceed this speed with sufficient power.

Q2: How do I measure waterline length?
A: Measure along the hull from bow to stern at the water's surface when the boat is at rest.

Q3: Why 1.34 as the multiplier?
A: This empirical constant accounts for the relationship between wave length and boat speed in salt water.

Q4: Can my boat go faster than hull speed?
A: Yes, but it requires exponentially more power and typically involves planing or semi-planing.

Q5: Does scale affect hull speed calculations?
A: The formula works for scale models when using their actual waterline length measurements.