PART NO. |
RUDDER SHAFT
dia. |
BODY
dia. "D" |
HEIGHT "H1" |
WEIGHT |
WORKING
LOAD (max) |
6GB060
- 6GB079
|
60
to 79
mm |
150
mm
|
300
mm |
1,3
kg |
4200
kg
|
6GB080
- 6GB104
|
80
to 104 mm |
170
mm
|
300
mm |
1,7
kg |
5600
kg
|
6GB104
- 6GB140
|
104
to 140 mm |
210
mm
|
300
mm |
2,5
kg |
7300
kg
|
| The applications for the 6GB000 series bearing: |
| The 6GB000 series bearings are specially designed for
production yachts. This bearing type
combines a very simple installation with a very smooth operation under all
circumstances as the bearing will always be aligned to the rudder shaft.
The bearing housing is made of GRP (resin type PROSET 125) , allowing it
to be laminated directly into the hull. A rudder tube is not required as
the bearing housing is designed to extend above the boats waterline. It
must be sealed to the rudder shaft with a gaiter.
In the case of female moulded production boats the bearings housing can be
mounted into the hull mould before lamination and gel coating begins.
After gel coating the hull the peel-ply is removed from the bearing's
outer face and the hull is laminated as usual with the exception that the
hull laminate runs up the side of the bearing housing. This means that the
bearing is already installed in the hull upon de-moulding, thus providing
an integrated rudder support, and saving production time.
|

Installation of JEFA Marine composite bearings in female moulded
hulls:
- Secure the bearing-housing in it's place in the hull. The bearing should
be jigged in place firmly so that it won't alter position when worked during
lamination.
- With the peel ply intact, tape a bag over the top of the bearing so as to
cover the entire bearing neatly.
- Gel-coat the hull.
- Just prior to lamination, carefully remove the bag and the peel ply from
the bearing.
- Laminate the hull making sure that the laminate runs up the side of the
bearing in full thickness. It can be tapered down over a 100 mm span
beginning just above the self aligning bearing in the bearing sleeve.
- There should always be a skin joint around the bearing that is at least
three times the bearing housings measurement in diameter, and the laminate
should have a minimum thickness of 1.5x(1.8+(LWL/1.8), this thickness is not
including the foam ram mentioned bellow.
- When laminating the hull the first 10% of the prescribed laminate should
be laid directly into the hull to bearing housing joint. On top of this
"outer skin" there should be a foam ramp or fillet (minimum 200
kilo/m3 density), which encircles the bearing housing. The remainder of the
laminate runs up over the foam ramp.
- When the hull is de-moulded and the deck bearing is ready for installation
the bearing cassette can be inserted into the two slots in the bearing
housing and rotated into place.
Please remember that these guidelines represent good practice, however all
structural components of a sailing vessel should be engineered by a qualified
engineer for the actual case. JEFA MARINE takes no responsibility for any
structural failures which might result from the use of these guidelines.
|