The installation of the fin units requires that the vessel be hauled out. The following is a step by step for the complete installation of the fin units:

a- Locate convenient positions for the fins within the middle third of the water line. For two fins system, the fins are located at least 12' from the propeller. For four fins system or more , the fins will be placed at least 8' apart and the most aft will be at least 12' from the propeller. Avoid locating the fins in curved position of the hull such as close to bow or stern where the water flow is essentially not parallel to the keel . If however, such position is essential, then the direction of the water flow at that position has to be determined to locate the neutral position of the fin.

b- Using a wooden template of the base plate, position the template against the outside of the hull at the desired location. The shaft of the fin should be almost perpendicular to the hull. The tip of the shaft at this position must be at least 8' within a vertical line from the widest point of the hull as well as the keel line. This arrangement insures that the fins will be protected when the vessel is being docked or hauled.

c- Using the template. drill holes 9/16" for the holding bolts ( three ) and the hole for the center shaft 2" diameter.

d- Assemble the outer plate on the hull. Note that the three holding bolts should be of the same length as these will be used to align the inner base plate.

e- Assemble the inner base plate and use the length of the holding bolts to insure that the inner and outer plate are parallel. Tighten the nuts or the holding bolts and be sure that the drive shoe is moving freely and without any binding.

f- Mark the excess length of the tube ( 1 3/4" ) above the drive shoe. Disassemble the unit and cut off the excess length.