How to Measure Your Trolling Motor Shaft Length?

How to Measure Your Trolling Motor Shaft Length?Determining the proper shaft length for your trolling motor is crucial to ensure optimal performance and maneuverability. It is important to prevent the propeller from coming out of the water during operation, also known as “cavitation.” At the same time, you don’t want the shaft to be too long and catch on the bottom or be difficult to stow. Measuring and selecting the correct shaft length is essential to avoid these issues.

When it comes to selecting the proper trolling motor shaft length, there are a few factors to consider. Bow mount motors require more precise shaft length selection compared to transom mount motors. The distance from the mounting surface on the bow to the waterline should be measured, and a recommended length is added to this measurement. Factors like fishing conditions, rough waters, and standing up while steering should also be taken into account.

Measuring the bow mount shaft length involves determining the distance from the mounting surface on the bow to the waterline. For freshwater fishing, the bow to waterline measurement is added to a recommended minimum shaft length. In saltwater fishing, a longer recommended minimum shaft length is added to accommodate for the additional swell or chop. It is advised to go with a longer shaft length if unsure between two options to avoid ending up with a motor that is too short.

Measuring the transom mount shaft length is slightly less critical than the bow mount, but it is still important to double-check. The distance from the mounting spot on the transom to the waterline is measured, and a desired shaft length is obtained by adding 20 inches to this measurement. If faced with a choice between two sizes, it is recommended to opt for the larger size. Rough water conditions may require an additional 5 inches to be added to the shaft length.

While measuring the shaft length of your current motor can provide an approximate length, it should not be the sole factor in choosing the right shaft length. Consulting a local dealer or boat manufacturer can provide insights into typical installations for similar boat models. Overall, taking accurate measurements and following the recommended guidelines will help ensure that your trolling motor shaft length is suitable and provides efficient and effective operation.

Properly measuring and selecting the shaft length for your trolling motor is crucial for optimal performance on the water. Consider the unique characteristics of your boat, fishing conditions, and any specific requirements such as standing up while steering. Taking accurate measurements and following the recommended guidelines will help ensure that your trolling motor shaft length is suitable and provides efficient and effective operation.

Selecting the Proper Trolling Motor Shaft Length

When it comes to choosing the right trolling motor shaft length, there are several factors to consider to ensure optimal performance and maneuverability on the water. Whether you have a bow mount or transom mount motor, selecting the correct shaft length is crucial for a smooth and efficient boating experience.

For bow mount motors, the distance from the mounting surface on the bow to the waterline is a key measurement. This measurement should be taken carefully, as it determines the recommended length for your motor. Additionally, factors such as fishing conditions, rough waters, and standing up while steering should be taken into account when determining the right shaft length.

On the other hand, measuring the shaft length for transom mount motors is slightly less critical but still important. By measuring the distance from the mounting spot on the transom to the waterline, you can determine the desired shaft length. Adding 20 inches to this measurement is a general guideline, but if you anticipate rough water conditions, it may be necessary to add an additional 5 inches to the shaft length.

Factors to Consider for Shaft Length Selection:

  • The distance from the mounting surface to the waterline
  • Fishing conditions (freshwater or saltwater)
  • Rough water conditions
  • Standing up while steering
Boat Type Shaft Length Calculation
Bow Mount Motor Bow to Waterline Measurement + Recommended Minimum Shaft Length
Transom Mount Motor Transom Mounting Spot to Waterline Measurement + 20 inches (or +25 inches for rough water conditions)

By carefully considering these factors and measurements, you can ensure that you select the proper trolling motor shaft length for your specific boating needs. Taking the time to measure accurately and following the recommended guidelines will result in a motor that provides efficient and effective operation while out on the water.

Measuring Bow Mount Shaft Length

When it comes to measuring the shaft length for a bow mount trolling motor, one crucial factor to consider is whether you will be fishing in freshwater or saltwater. The bow to waterline measurement differs depending on the fishing conditions, and it is essential to choose the appropriate shaft length accordingly.

In freshwater fishing, you will need to measure the distance from the mounting surface on the bow to the waterline. This measurement serves as the base for determining the minimum required shaft length. It is recommended to add a specific length, typically provided by the manufacturer, to ensure optimal performance.

On the other hand, if you plan to fish in saltwater, it is advisable to choose a longer shaft length. The additional swell or chop in saltwater requires a longer minimum recommended shaft length to avoid the propeller from coming out of the water. To determine the appropriate shaft length, measure the bow to waterline distance and add the saltwater-specific recommended length.

Table: Recommended Bow Mount Shaft Length

Fishing Environment Bow to Waterline Measurement Recommended Minimum Shaft Length
Freshwater Measure from bow mount to waterline Add freshwater recommended length
Saltwater Measure from bow mount to waterline Add saltwater recommended length

It is important to note that in case of uncertainty between two shaft length options, it is advisable to choose the longer one. Opting for a longer shaft length ensures that you do not end up with a motor that is too short, which can lead to performance issues and hinder your fishing experience.

By accurately measuring the bow mount shaft length and following the recommended guidelines, you can ensure that your trolling motor is properly equipped for your fishing environment. Choosing the appropriate shaft length will help improve maneuverability, prevent propeller cavitation, and optimize the overall performance of your trolling motor.

Measuring Transom Mount Shaft Length

When it comes to measuring the shaft length for a transom mount trolling motor, accuracy is important but not as critical as with a bow mount. To determine the correct shaft length, you will need to measure the distance from the mounting spot on the transom to the waterline. This measurement will serve as a base for determining the desired length of the trolling motor shaft.

To calculate the desired shaft length, it is recommended to add 20 inches to the initial measurement. This additional length helps ensure the propeller remains submerged in the water during operation, even in rough water conditions.

If you find yourself faced with a choice between two shaft lengths, it is generally best to opt for the longer size. Adding a few extra inches can provide added flexibility in challenging conditions and prevent the propeller from coming out of the water. In particularly rough water or choppy conditions, you may need to add an additional 5 inches to the shaft length to account for the increased turbulence.

Remember, determining the correct shaft length is crucial for optimal performance. Taking accurate measurements and following the recommendations will help ensure your trolling motor is the right fit for your boat and provides efficient operation on the water.

Trolling Motor Shaft Length Recommendations

Water Conditions Shaft Length Recommendation
Calm Water Measured distance + 20 inches
Rough Water Measured distance + 25 inches
Extreme Conditions Measured distance + 30 inches

The table above provides general recommendations for trolling motor shaft length based on water conditions. By adding the suggested number of inches to your measured distance, you can ensure that your transom mount trolling motor is properly sized for optimal performance in various situations.

Measuring the Shaft Length of Your Current Motor

When determining the proper shaft length for your trolling motor, measuring the shaft length of your current motor can be a helpful starting point. However, it is important to note that this measurement alone should not be the sole factor in choosing the right shaft length.

To measure the shaft length of your current motor, start by locating the base of the motor head. From there, measure vertically to the top of the propeller housing. This will give you an approximate shaft length that you can compare to the recommended guidelines provided by the manufacturer.

It is advisable to use either the “rated” shaft length specified by the manufacturer or take a bow to waterline measurement for a more accurate result. Consulting a local dealer or boat manufacturer who is familiar with your boat model can also provide valuable insights into typical installations.

Remember, selecting the correct shaft length is essential for optimal performance and maneuverability on the water. Taking accurate measurements and considering the recommended guidelines will help ensure that your trolling motor shaft length is suitable for your boat and provides efficient and effective operation.

Table: Comparison of Measured Shaft Length and Rated Shaft Length

Measured Shaft Length (inches) Rated Shaft Length (inches)
52 54
58 55
60 60
48 50

Conclusion

In conclusion, selecting the proper shaft length for your trolling motor is essential for optimal performance and maneuverability. Whether you have a bow mount or transom mount motor, taking accurate measurements and considering factors like fishing conditions and boat characteristics will help you determine the right shaft length.

Measuring the bow mount shaft length involves determining the distance from the mounting surface on the bow to the waterline. This measurement differs for freshwater and saltwater fishing, with additional allowance needed for saltwater due to swell or chop. When in doubt, it’s always better to choose a longer shaft length to avoid ending up with a motor that is too short.

Measuring the transom mount shaft length requires measuring the distance from the mounting spot on the transom to the waterline and adding 20 inches to obtain the desired shaft length. Adding extra inches may be necessary for rough water conditions. It’s advisable to opt for a larger size if faced with a choice between two options.

While measuring the shaft length of your current motor can provide an approximate length, it’s important to consider other factors and consult manufacturer guidelines. Take into account the rated shaft length specified by the manufacturer, or consider a bow to waterline measurement for more accurate results. Consulting with local dealers or boat manufacturers can also provide valuable insights for your specific boat model.

Richard Dodds
Latest posts by Richard Dodds (see all)

Leave a Comment