Guide Point 1: Positioning for Optimal Performance

📋 First Point to Consider: Positioning for Optimal Performance

Get as Low as Possible (Close to the Keel)

The first point to consider with transducer installation is to ensure the transducer is as low as possible on the boat. When we say "low," we mean as close to the keel as possible for the best water depth reading and performance.

⚠️ Critical: Avoid the Propeller Turbulence Zone

The propeller slipping issue: Your transducer creates a turbulence trail in a straight line behind it when the boat moves forward. If your transducer is positioned upstream in a direct line in front of the prop, the propeller will slip through the turbulent, aerated water. This causes the prop to run at high revs, which affects fuel economy and performance.

The solution: The transducer must be located as close to the keel as possible BUT OUTSIDE OF THE PROP DIAMETER. Imagine a circle around the outside of your prop—this is the diameter you need to avoid.

Avoid the Outer Edges of the Boat

Do not position the transducer on the outer edges of the boat (for single engine V-shaped boats, not catamaran hulls). Here's why:

  • As the boat gains speed, it's designed to raise out of the water for better performance
  • If the transducer is placed toward the outside edges, it will also raise out of the water
  • Even though it may look like it's in water, it's trying to read through turbulent top surface water and will not perform at its best

How Far from the Prop Diameter?

Finding the right distance:

  1. Trim your motor down as much as possible to see where the prop usually runs
  2. Position the transducer outside this diameter
  3. The distance will be determined by the size of your transducer

Size matters:

  • Large transducers (e.g., Airmar 1kW): These are like a brick in the water. Their turbulence trail is large and may spread greater than the transducer's overall size. Position these approximately 100mm away at the closest point.
  • Slimline transducers: These create a slimmer turbulence trail, so you could potentially position them closer. However, 100mm away is a good safe distance to avoid turbulence issues.

 

 

 

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