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• If there is no suitable location where the hull frame and keel intersect, install suitable
"T" shaped reinforcement ribs, then weld the base of the frame to the reinforcement
ribs and the sides of the reinforcement ribs to the hull walls or other nearby
reinforcement ribs. The reinforcement ribs should be secured in the fore, aft, port
and starboard directions.
• Install the reinforcement ribs as near as possible to the top of the retraction tank,
allowing 150 to 200 mm space for tightening of nuts and bolts.
• Fit a doubling plate (a plate added to another to give extra strength or stiffness) to
the location where the retraction tank is welded to the hull bottom. While it is
recommended that both sides attach to the hull, consult with the installer
regarding length and diameter.
• The thickness for doubling plates and reinforcement ribs is 12 mm minimum.
Doubling plate
Fit doubling plates where the retraction
tank meets the frame and keel.
1.1.3
How to install the hull unit on the retraction tank
Weld the retraction tank and allow sufficient time for cooling. Install the hull unit as
follows:
Prepare the materials and tools as shown below.
Name
Screw wrench
Ethyl alcohol
Waste cloths
Lithium grease
Molytone grease
Note: When retrofitting a CSH-20 or FSV-24/30/35 hull unit on a steel hull, see
section 1.9.
1. Clean the flange and O-ring groove of the retraction tank (welded to hull) with ethyl
alcohol moistened waste cloths.
Ship's framework
150 to
200 mm
Stern
M20 (opposite side 30 mm)
99.5%
For O-ring and drive shaft, common lithium grease
(the equivalent to Daphne Grease MP #2 (IDEMITSU KOSAN
CO.,LTD))
For gears and bearings, Molytone grease #2
(by SUMICO LUBRICANT CO., LTD)
1. HOW TO INSTALL THE SYSTEM
Reinforcement rib
added along keel line
Keel line
Bow
Reinforcement ribs
No. of ribs: Minimum 4
Thickness: at least 12 mm
Minimum 12 mm
Remarks
1-3
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