1. What Is Final Drive Ratio?

The final drive ratio in RC cars represents the overall gear reduction between the motor and the wheels. It determines how many times the motor must rotate to make the wheels complete one full revolution.

2. How Does The Calculator Work?

The calculator uses the final drive ratio formula:

Where:

• \( Spur \) — Number of teeth on the spur gear
• \( Pinion \) — Number of teeth on the pinion gear
• \( Internal \) — Internal gear ratio of the transmission/differential

Explanation: The formula calculates the total gear reduction by multiplying the spur/pinion ratio with the internal transmission ratio.

3. Importance Of Final Drive Ratio

Details: The final drive ratio significantly affects your RC car's performance. Higher ratios provide more torque and acceleration but lower top speed, while lower ratios offer higher top speed but less acceleration.

4. Using The Calculator

Tips: Enter the number of teeth on your spur and pinion gears, plus your vehicle's internal transmission ratio. All values must be positive numbers greater than zero.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical final drive ratio for RC cars?
A: Most 1/10 scale RC cars have final drive ratios between 8:1 and 12:1, but this varies significantly based on vehicle type and motor.

Q2: How does gear ratio affect battery life?
A: Higher gear ratios (numerically lower) typically provide better battery life as the motor runs at lower RPMs for a given speed.

Q3: Can I use this calculator for any RC vehicle?
A: Yes, this calculator works for any RC car, truck, or buggy that uses spur and pinion gears with an internal transmission ratio.

Q4: What if my vehicle has multiple gear reductions?
A: The internal ratio should represent the combined ratio of all gear reductions between the spur gear and the wheels.

Q5: How do I find my vehicle's internal ratio?
A: Consult your vehicle's manual or manufacturer specifications. Most manufacturers provide this information for their models.