Furuno SEARCHLIGHT CH-250 User Manual
Page 18
8
For small FRP ship
For small FRP ship retraction tank should be 2 degrees against ship’s draft. Therefore, 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 figure below.
Retraction dome
Fin
Bottom of ship
This fin makes a smooth stream in the retraction dome. Attach the fin (height:1-1.5 cm, FRP).
Mounting of transducer tank
Install the transducer tank referring to the hull unit outline drawings at the back of this manual.
Note 1:
When making a retraction tank locally, the inside diameter of the retraction tank should
not be more than
φ
190
±
0.5 as shown on outdrawing at the back of this manual. If larger,
the hull unit may be danger.
Note 2:
Locate the retraction tank so that the center of any two bolt holes is facing the ship’s
bow.
Bow
a=b
a
b