Question: I've seen 2 types of thru-hull transducers for the Color Twinscope, 1 with single transducer and 1 with dual transducers. What are the dual transducers for? Do they provide an extra function for the display or is it to offset a larger keel? Does a large keel affect the horizontal sweep of the sonar (single or dual)? Answer: We offer the twin thru-hull transducers for small high speed boats. The single thru-hull transducer is twice as wide as each of the dual thru-hulls. If the boat does no allow an installation on or close to the center line, then the transducer is sometimes placed 2-3 feet away from the center line. On a high speed boat (40+MPH) the drag can be felt in the steering. If the boat does not have trim tabs to trim this out, then the boat can 'pull' to one side at high speeds. The dual transducer configuration allows for a transducer on each side of the hull which evens out the water flow across the hull. This does not account for the forward horizontal sweep being blocked by a keel, or deep V hull. In order for the forward horizontal scan to pass beneath the hull, the angle between the transducer and lowest point on the hull must be less than 10 degrees.
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