Seakeeper Ride | Mechanical Installation Manual
5.4. Overhead Clearance
Because the Controllers are mounted externally on the hull, there may be some installations where space must be cleared to create room for the Controllers. There must be at least 5 in. (127 mm) of clearance between the aft most running surface and any surface above where the Controller will be placed (this includes any bracket or similar hardware that hangs over the Controller). This clearance height is represented by H in the figure below. The Controller will extend aft of the hull by 8 in. (203 mm).