Raymarine E70085 Dragonfly, Operation Manual

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4.1 Selecting a location for the
transducer
This product is supplied with a transom mount transducer. The
guidelines below should be followed when selecting a location
for the transducer.
Note: The transducer is not suitable for mounting on vessels
where the transom is aft of the propeller(s).
For best performance the transducer must be installed in a
location with the least turbulence and aeration. The most
effective way to determine this is by checking the water flow
around the transom whilst underway.
• The transducer should be mounted close to the keel
(centreline) of the vessel, so that the transducer remains fully
submerged when the vessel is turning.
• The transducer must be mounted a suitable distance from
the propeller(s) to avoid wake.
• For clockwise rotating propellers the transducer should be
mounted on the starboard side, for anti-clockwise rotating
propellers the transducer should be mounted on the port side.
D 12640-1
• On a twin engine vessel the transducer should be mounted
between the engines.
D 12641-1
• Turbulence can also be caused by a number of other factors
such as steps, ribs, strakes, and rows of rivets. The turbulence
appears aft of these locations.
1
2
4
3
D 12636-1
1
Step
2 Rib
3 Row of rivets
4 Strake
• Air trapped under the front of the vessel can travel under the
hull and appear as aeration aft.
• If installing on the step of a stepped transom, allow sufficient
room above the transducer for transducer kick-up.
D12644-1
Note: Optimum transducer location will vary depending
on vessel type. Optimum transducer height and angle
should be obtained by testing the transducer with the
vessel in the water before locking the transducer’s
position.
Transducer dimensions
The transducer’s dimensions including the mounting bracket
are shown below.
A
B
D12638-1
A 202.6 mm (8 in)
B 117.4 mm (4.6 in)
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Dragonfly