Seakeeper Removal — Safe Decommissioning & Structural Reinfill Guide

Why Remove a Gyro Stabilizer?

While gyro stabilizers provide significant comfort improvement, there are legitimate reasons for removal:

Vessel sale: Buyer doesn't want the ongoing power/service commitment
Repowering: New engines change weight distribution; gyro location no longer optimal
Downsizing: Moving to smaller vessel; gyro is oversized or incompatible
Reliability concerns: Repeated failures; owner prefers fins or no stabilization
Space reclamation: Machinery space needed for other systems (generator, watermaker)
Cost/benefit: Annual service costs exceed value for limited-use vessel

Removal Process

Pre-Removal Assessment

Before touching the unit, we document:

Unit model, serial number, and run hours
Current structural condition around foundation
Electrical disconnection points and wire routing
Cooling system isolation plan
Crane/lift requirements based on unit weight

                    Weight Reference: SK2 = 218 lbs · SK6 = 365 lbs · SK9 = 485 lbs · SK16 = 720 lbs · SK18 = 850 lbs · SK26 = 1,200 lbs · SK35 = 1,650 lbs · SK40 = 2,100 lbs
                

Safe Decommissioning

Proper shutdown sequence to prevent rotor damage and personal injury:

Controlled spin-down (never brake a spinning rotor)
Electrical lockout/tagout
Coolant drain and capture
Foundation bolt torque release in star pattern
Rigging and lift with rated straps/chains

Safety Critical: A spinning gyro rotor stores enormous kinetic energy. Never attempt removal with rotor spinning. Always verify complete stop before unbolting.

Hull Reinfill

The foundation cutout must be properly sealed to restore hull integrity:

Small units (SK2–SK9): ~10–14" diameter cutout. Reinfill with GRP or carbon fiber laminate, matching original hull thickness + safety margin
Medium units (SK16–SK18): ~16–20" cutout. Requires structural core replacement and tabbing to adjacent stringers
Large units (SK26–SK40): ~24–30" cutout. Naval engineering review recommended. FEA analysis for composite hulls

Weight Rebalancing

Removing 200–2,000 lbs from the vessel changes trim, stability, and running attitude:

Recalculate longitudinal center of gravity (LCG)
Adjust trim tabs or interceptor settings
Verify static stability (GM) with new weight distribution
Sea trial to validate running attitude at cruise RPM

What Happens to the Removed Unit?

Options depend on unit condition and model:

Serviceable units: Can be resold through independent channels or relocated to another vessel
High-hour units: Bearing replacement + refresh may be cost-effective for resale
Failed units: Component recovery (motors, heat exchangers) or responsible metal recycling

We do not sell used gyros or broker units. We provide independent condition assessment if you choose to sell independently.