When it comes to outfitting your pontoon boat with a trolling motor, one of the most crucial decisions you’ll need to make is selecting the correct shaft length. The shaft length of a trolling motor is not just a minor detail; it plays a significant role in ensuring your motor performs optimally and that your boat handles well in various water conditions. In this comprehensive guide, we will explore everything you need to know about pontoon boat trolling motor shaft length, including how to choose the right size, the impact on performance, and price and specs of popular trolling motors on the market.
Understanding Trolling Motor Shaft Length
What is Shaft Length?
The shaft length of a trolling motor is the distance from the motor head (where the controls are located) to the propeller. This measurement is crucial because it determines how deeply the propeller sits in the water. For a pontoon boat, which typically sits higher on the water due to its buoyancy, selecting the correct shaft length ensures that the propeller is submerged adequately for efficient operation.
Why Shaft Length Matters
Choosing the right shaft length for your pontoon boat is essential for several reasons:
- Performance: A shaft that is too short may cause the propeller to be partially submerged or come out of the water in choppy conditions, reducing the motor’s efficiency and power.
- Control: A properly sized shaft ensures better control and handling of the boat, especially in windy or rough waters.
- Avoiding Damage: If the shaft is too long, it can drag in shallow water, potentially damaging the motor or propeller.
How to Determine the Correct Shaft Length for Your Pontoon Boat
Selecting the appropriate shaft length depends on the height of your pontoon boat’s transom or bow (depending on where you plan to mount the motor). Here’s how to measure and choose the right shaft length:
Step 1: Measure the Distance
- Bow-Mounted Motors: Measure the distance from the mounting point (usually the bow of the boat) to the waterline. This distance is the key factor in determining the required shaft length.
- Transom-Mounted Motors: Measure from the top of the transom to the waterline.
Step 2: Add Clearance
To ensure the propeller stays submerged even in rough conditions, add 20 inches to the measurement for a bow-mounted motor and 16 inches for a transom-mounted motor. This added length accounts for waves and water fluctuations.
Step 3: Match with Shaft Length Options
Once you have the final measurement, compare it with available shaft lengths:
- 36 inches: Ideal for smaller pontoon boats or shallow water use.
- 42 inches: Suitable for medium-sized pontoon boats.
- 48 inches and above: Recommended for larger pontoon boats or those used in rougher waters.
Common Shaft Lengths for Pontoon Boats
Here’s a quick guide to common shaft lengths and their applications:
- 30-36 inches: Typically used for smaller, lightweight pontoons or in shallow waters. These are less common for pontoon boats.
- 42-48 inches: Standard for most medium to large pontoon boats, providing a good balance of performance and control.
- 50+ inches: Used for larger pontoons or when navigating in very rough or deep waters.
Popular Trolling Motors for Pontoon Boats: Specs and Prices
When choosing a trolling motor, consider both the shaft length and other key specifications like thrust, voltage, and additional features. Here are some popular trolling motors ideal for pontoon boats:
1. Minn Kota PowerDrive 70 Bow-Mount Trolling Motor
- Thrust: 70 lbs
- Shaft Length: 54 inches
- Voltage: 24V
- Features: i-Pilot GPS, AutoPilot, Digital Maximizer
- Price: $1,099 Why it’s a great choice: The 54-inch shaft makes it ideal for larger pontoon boats, and the i-Pilot GPS system provides advanced control and navigation options.
2. MotorGuide Xi3 Wireless Freshwater Bow Mount Trolling Motor
- Thrust: 55 lbs
- Shaft Length: 48 inches
- Voltage: 12V
- Features: Wireless remote control, SecureStep system
- Price: $849 Why it’s a great choice: The 48-inch shaft is perfect for mid-sized pontoon boats, and the wireless remote allows for convenient, hands-free control.
3. Newport Vessels NV-Series Saltwater Transom-Mount Trolling Motor
- Thrust: 55 lbs
- Shaft Length: 36 inches
- Voltage: 12V
- Features: 8-speed control system, corrosion-resistant design
- Price: $239 Why it’s a great choice: This motor is budget-friendly and works well for smaller pontoons or those used in shallow waters.
Additional Tips for Choosing the Right Trolling Motor
- Consider the Water Conditions: If you frequently boat in rough or deep waters, opt for a longer shaft to ensure consistent performance.
- Think About the Boat’s Load: A fully loaded pontoon boat sits lower in the water, so adjust your shaft length accordingly.
- Factor in the Motor’s Thrust: More powerful motors often require longer shafts to handle the increased force and keep the propeller submerged.
Conclusion
Selecting the correct trolling motor shaft length for your pontoon boat is crucial for optimal performance and control. By measuring accurately and considering the type of waters you navigate, you can choose a shaft length that ensures your motor operates efficiently, providing a smoother and more enjoyable boating experience. Whether you’re in the market for a new trolling motor or simply looking to understand the intricacies of your current setup, knowing the importance of shaft length is key to making informed decisions on the water.
Have questions about trolling motor shaft lengths or need more advice? Drop a comment below, and we’ll help you make the best choice for your pontoon boat!
Happy Boating!
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Read Guide to Water Pontoons: Everything You Need to Know until we meet in the next article.