1. MOUNTING
1.4.3Transducer tank
Tank length
Shorten the transducer tank so the transducer is lowered into water as deep as possible. Pay particular attention to the tank length Lt. Determine the length of the main shaft.
•Length of main shaft = Lt + 200 mm (for 400 stroke)
•Length of main shaft = Lt + 50 mm (for 250 stroke)
Note: When the retraction tank is constructed locally, finish it so that welding beads do not protrude on the inner surface of the tank. The tank guide will hit the bead, burning out the raise/lower motor. Also, do not position the welding bead in the ship’s
For small FRP ship
Welding bead
Welding bead
The retraction tank should be mounted in
parallel with the ship’s draft. For a small ship, however, the hull has 2 degrees of tilt rising toward the bow. This creates high water pressure in the tank because of the resistance at the rear of the tank well. To solve this problem, attach a fin to the hull at the location shown in the figure below.
Retraction tank
Bottom of ship
Fin
This fin creates a smooth stream in the retraction dome. Fin specifications: Height,
