Furuno Ls4100 Acceptable transducer mounting locations, Thru-hull mount transducer dimensions

submerged, even when the boat is rolling, pitching or up on a plane at high speed.

•A practical choice would be somewhere between 1/3 and 1/2 of the boat’s length from the stern. For planing hulls, a practical location is generally rather far astern, so that the transducer is always in water regardless of the planing attitude.

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120	120
30	28
	68
68	87	Unit: mm

520-5PSD 520-5MSD

Thru-hull mount transducer dimensions

Acceptable transducer mounting locations

Position 1/2 to 1/3 of the hull

lfrom stern.

15 to 30 cm off center line (inside first lifting strakes.)

HIGH SPEED-V HULL

lWithin the wetted bottom area Deadrise angle within 15°

Suitable transducer mounting locations

Typical thru-hull mount transducer installations

Flat Washer

Rubber Washer

Fairing

Block

Hull

Deep-V Hull

Flat Washer
Hull	Cork
Rubber	Washer
Washer

Flat Hull

Typical thru-hull mount transducer installations

Procedure for installing the thru-hull mount transducer

1.With the boat hauled out of the water, mark the location chosen for mounting the transducer on the bottom of the hull.

2.If the hull is not level within 15° in any direction, fairing blocks made out of teak should be used between the transducer and hull, both inside and outside, to keep the transducer face parallel with the water line. Fabricate the fairing block as shown below and make the entire surface as smooth as possible to provide an undisturbed flow of water around the transducer. The fairing block should be smaller than the transducer itself to provide a channel to divert turbulent water around the sides of the transducer rather than over its face.

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