Interphase Color Twinscope Operation Manual page 10

Special Note on the
Color Twinscope Transducers
Q: There are 2 types of thru-hull transducers for the
Color Twinscope, 1 with a 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)?
A: Interphase offers the twin thru-hull transducers for
small high speed boats. The single thru-hull transducer
is nearly 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
The Transom Mounted Transducer is designed
boat does not have trim tabs to trim this out, then the
for boats with a top speed below 40MPH.
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. If the keel or hull of
the boat will block the forward horizontal scan, then the
Interphase iScan 180 should be considered.
The Thru-hull Transducer is for boats that
EXCEED 40MPH and /or have inboard motors.
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