Seakeeper 26 GYRO User manual

Rev 2 FEBRUARY 2015
INSTALLATION MANUAL
SEAKEEPER 26 GYRO

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INSTALLATION
MANUAL
Product:
Document #:
Rev:
SEAKEEPER 26 GYRO
90265
2
SEAKEEPER 26 GYRO
INSTALLATION MANUAL
FEBRUARY 2015
Contents:
Section 1 – Mechanical Installation & PC-120 Guide
Section 2 – Electrical Installation
Section 3 – Cooling Installation
Section 4 – Startup
Section 5 – Installation Checklist and Required Supplies
44425 PECAN COURT, SUITE 151
CALIFORNIA, MARYLAND, 20619, U.S.A
PHONE: [phone]
FAX: [phone]
E-MAIL: [e-mail]

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Section 1: MECHANICAL INSTALLATION
1.0 Introduction
This document is intended to give details and guidance to a boat builder or equipment installer to install
the Seakeeper 26 Stabilizing Gyro. The gyro is capable of producing loads up to 35.89 KN (8,070 lbs.) at
each of the four mounts and careful consideration should be given to foundation design to insure it is
capable of transferring these loads into the hull.
There are two methods of installing the Seakeeper 26 gyro:
1) Bolt-In Installation
2) Saddle Installation
It is assumed that the installer is familiar with bonding using high strength adhesives or mechanical
fasteners to marine structures and has performed structural analysis to assure the structure to which
the gyro mounts can properly transfer the loads the gyro creates into the hull structure. If the
installer has any doubt about the ability of the structure to transfer the gyro loads to the hull then he
should contact a licensed naval architect or marine engineer to do a structural analysis.
The installer should review the following list of reference drawings to ensure the installation procedure
is fully understood.
Reference Drawings
90244 Seakeeper 26 Gyro Hardware Scope of Supply
90271 Seakeeper 26 Gyro Installation Details – Bolt in Method
90272 Seakeeper 26 Gyro Installation Details – Bond in Method
90085 Seakeeper 26 Gyro Bond-in Saddle Kit
90086 Seakeeper 26 Gyro Bolt-in Installation Kit
90088 Seakeeper 26 Gyro Bond-In Installation Fixture Kit
90089 Seakeeper 26 Gyro Bolt-In Installation Fixture Kit
90310 Seakeeper 26 Gyro Cable Block Diagram
90320 Seakeeper 26 Gyro Cooling Water Schematic
FIGURE 1 – SEAKEEPER 26 GYRO

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Section 1: MECHANICAL INSTALLATION
1.1 Precautions
•Gyro must only be lifted from the supplied lifting eyes (See Section 1.4).
•Gyro flywheel is supported by precision bearings. Make certain while unpacking and lifting gyro
assembly to NOT drop or impart mechanical shock as damage to bearings could result.
•While handling / installing gyro assembly, protect exposed hydraulic brake cylinder rods (See
Figure 1) from scratches or damage as this could lead to premature seal failure and oil leaks.
•While handling / installing gyro assembly, do not allow electrical fittings that exit bottom of gyro
enclosure to come in contact with any surface or object as this could damage the fittings and
potentially affect the vacuum integrity of the enclosure.
•Exercise care to protect gyro painted finish as damage to finish could lead to early appearance
degradation of installed gyro.
1.2 Selection of Gyro Installation Location
Selection of mounting location of gyro should consider the following desirable features:
The gyro must be installed aft of amidships to minimize high
acceleration loadings due to hull/wave impacts during operation at
high speed or in large waves.
•Overhead access or sufficient clearance for removal / re-installation of gyro for overhaul in
future years.
•Gyro should be installed in a dry space to minimize effects of corrosion.
•Clearance for replacement of gimbal angle sensor on gyro gimbal shaft (see Figure 2).
•Clearance for filling / purging brake hydraulic oil (see Figure 2).
•Clearance for filling water/glycol cooling circuit (see Figure 2).
•Clearance for replacement of brake hydraulic cylinders (see Figure 2).

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Section 1: MECHANICAL INSTALLATION
VIEWS SHOWING RECOMMENDED CLEARANCES AROUND GYRO FOR USE OF HAND TOOLS, EASE OF MAINTENANCE,
INSTALLATION AND PROPER OPERATION.
FIGURE 2 – INSTALLED GYRO CLEARANCE CONSIDERATIONS

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Section 1: MECHANICAL INSTALLATION
Safety
There is a large torque about the gimbal axis when the gyro is precessing. Gyro cover panels
are provided to prevent personnel or equipment from contacting the gyro while it is in
operation. These covers should not be stepped on, or have anything placed on top. The
covers should always be in place during operation. If it is ever necessary to access the gyro
while the flywheel is spinning, the gyro must be locked at the display to stop the gyro from
precessing. Gyro maintenance should not be attempted unless the gyro is locked and the
flywheel has stopped spinning.
The gyro should be treated with the same respect one gives a high speed rotating propeller
shaft or engine shaft.
Noise/Soundproofing
Gyro noise has been measured under steady state conditions (no wave load) in Seakeeper's lab and in
our test boat. The steady state noise is typically in the range of 70-75 dB un-weighted. As the
frequencies emitting the highest sound pressures are low (like other marine machinery), it is
recommended that the gyro be installed in a machinery space that is already treated with
soundproofing.

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Section 1: MECHANICAL INSTALLATION
1.3 Selection of Installation Method
The Seakeeper 26 gyro can be affixed to the hull structure using two methods 1) Use bolt-in installation
or 2) saddle installation. See figures below.
OPTION 1- DIRECT FASTENING OF GYRO FOUNDATION TO SHIPS STRUCTURE
Option 1 would be applied when a metal structure is available for attachment. The foundation would
fasten directly to hull structure using isolation gaskets and either M16 or 5/8” fasteners. Depending on
the structure to which the gyro is fastened, blind threaded holes or thru-bolting can be utilized.
OPTION 2- SADDLE INSTALLATION (4 PLACES)
Option 2 would be most commonly used on a hull constructed of glass reinforced plastic (GRP) or
fiberglass. For this option, four 16 inch (406 mm) long by 8 inch( (203 mm) deep saddles are bonded to
properly spaced and prepared structural members that are an integral part of the hull structure.
Seakeeper recommends using a structural adhesive with a lap shear strength of 2000 psi (13.8 MPa) or
greater. Careful consideration should be exercised by the installer while selecting the appropriate
adhesive. Compatibility with the gyro’s cast aluminum A356- T6 saddles, hull structure and pot life are
three important factors to consider. Proper surface preparation in accordance with adhesive
manufacturer’s recommendations prior to installation is very important.

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Section 1: MECHANICAL INSTALLATION
1.4 Unpacking Crate
1) Reference Seakeeper Drawing No. 90244 Seakeeper 26 Gyro Hardware Scope of Supply for
items that ship with the gyro.
2) Remove electrical components, cables, and misc. items and set aside.
3) Remove packing materials that secure gyro assembly inside the crate.
4) Remove top and angled face cover panels to access lifting eyes
5) Attach spreader bar to the two lifting eyes located on the top of the gyro enclosure. Stay clear
of any other parts on the gyro. Gyro weighs 1383 kg (3050 lbs). See Figure 4 below.
FIGURE 4 – LIFTING ARRANGEMENT
Spreader Bar
Lifting Eyes